- A facile strategy to enhance the fill factor of ternary blend solar cells by increasing charge carrier mobility
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Two conjugated polymers based on benzo[1,2-b:4,5-b′]dithiophene (BDT) with triethylene glycol (TEG) and ethylhexyl side chains (abbreviated as PBDTT-TEG and PBDTT-EH, respectively) were designed and synthesized. A polymer field-effect transistor of PBDTT-TEG exhibited a charge carrier mobility nearly one order of magnitude higher than that of PBDTT-EH. Measurements on polymer solar cells (PSCs) based on polymer:[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) binary blends showed the PBDTT-TEG-based devices had higher short-circuit current density (Jsc) than PBDTT-EH. The effect of the incorporation of PBDTT-TEG into PBDTT-EH on the photovoltaic properties has been investigated by blending them together with different ratios. The optimization of the devices showed an obvious increase in fill factor (FF) values and an improvement in efficiency compared with their binary ones, which is ascribed to a higher charge mobility and higher crystallinity of PBDTT-TEG.
- Lu, Kun,Fang, Jin,Zhu, Xiangwei,Yan, Han,Li, Denghua,Di, Chong'An,Yang, Yanlian,Wei, Zhixiang
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- Synthesis, characterization, and photovoltaic properties of a low-bandgap copolymer based on 2,1,3-benzooxadiazole
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PBDTBO, a conjugated polymer comprising benzo[1,2-b:4,5-b′] dithiophene (BDT) and 5,6-bis(octyloxy)benzo[c][1,2,5]oxadiazole (BO) units, exhibits a deep HOMO energy level of -5.27 eV and excellent solubility. A device incorporating PBDTBO and [6,6]-phenyl-C61-butyric acid methyl ester (1:1, w/w) exhibited a power conversion efficiency of 5.7%.
- Jiang, Jian-Ming,Yang, Po-An,Chen, Hsiu-Cheng,Wei, Kung-Hwa
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- Comparison of thiophene- and selenophene-bridged donor-acceptor low band-gap copolymers used in bulk-heterojunction organic photovoltaics
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We report a detailed comparison of absorption spectroscopy, electrochemistry, DFT calculations, field-effect charge mobility, as well as organic photovoltaic characteristics between thiophene- and selenophene-bridged donor-acceptor low-band-gap copolymers. In these copolymers, a significant reduction of the band-gap energy was observed for selenophene-bridged copolymers by UV-visible absorption spectroscopy and cyclic voltammetry. Field-effect charge mobility studies reveal that the enhanced hole mobility of the selenophene-bridged copolymers hinges on the solubilising alkyl side chain of the copolymers. Both cyclic voltammetry experiments and theoretical calculations showed that the decreased band-gap energy is mainly due to the lowering of the LUMO energy level, and the raising of the HOMO energy level is just a secondary cause. These results are reflected in a significant increase of the short circuit current density (JSC) but a slight decrease of the open circuit voltage (VOC) of their bulk-heterojunction organic photovoltaics (BHJ OPVs), of which the electron donor materials are a selenophene-bridged donor-acceptor copolymer: poly{9-dodecyl-9H-carbazole-alt-5, 6-bis(dodecyloxy)-4,7-di(selenophen-2-yl) benzo[c][1,2,5]-thiadiazole} (pCzSe) or poly{4,8-bis(2-ethylhexyloxy)benzo[1,2-b;4,5-b′]dithiophene-alt-5,6- bis(dodecyloxy)-4,7-di(selenophen-2-yl)benzo[c][1,2,5]-thiadiazole} (pBDTSe), or a thiophene-bridged donor-acceptor copolymer: poly{9-dodecyl-9H-carbazole-alt- 5,6-bis(dodecyloxy)-4,7-di(thiophen-2-yl)benzo[c][1,2,5]-thiadiazole} (pCzS) or poly{4,8-bis(2-ethylhexyloxy)benzo[1,2-b;4,5-b′]dithiophene-alt-5, 6-bis(dodecyloxy)-4,7-di(thiophen-2-yl)benzo[c][1,2,5]-thiadiazole} (pBDTS); the electron acceptor material is [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Judging from our device data, the potential Se-Se interactions of the selenophene-bridged donor-acceptor copolymers, which is presumably beneficial for the fill factor (FF) of BHJ OPVs, is rather susceptible to the device fabrication conditions.
- Chen, Hung-Yang,Yeh, Shih-Chieh,Chen, Chao-Tsen,Chen, Chin-Ti
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- Synthesis of a low band gap polymer and its application in highly efficient polymer solar cells
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(Chemical Equation Presented) HOMO level of the PBDTTT-based polymer was successfully reduced by introducing an keton group in place of the ester group. The average PCE of the PBDTTT-based devices reached 6.3% with a champion PCE result of 6.58%. Due to i
- Hou, Jianhui,Chen, Hsiang-Yu,Zhang, Shaoqing,Chen, Ruby I.,Yang, Yang,Wu, Yue,Li, Gang
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- Organic Semiconductor Compound, Organic Thin Film Including the Organic Semiconductor Compound and Electronic Device Including the Organic Thin Film
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Provided is an organic semiconductor compound which is represented by chemical formula 1 or 2. Moreover, provided is an organic thin film containing the same. In the chemical formulas 1 and 2, each substituent is the same as defined in the present specification. According to the present invention, it is possible to reduce production costs for devices.COPYRIGHT KIPO 2018
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- Dithieno[3,2-b:2′,3′-d]pyrrole-benzo[c][1,2,5]thiadiazole conjugate small molecule donors: Effect of fluorine content on their photovoltaic properties
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Two new small molecule donors, namely ICT4 and ICT6 with D1-A-D2-A-D1 architecture having 2,4-bis(2-ethylhexyl)-4H-dithieno[3,2-b:2′,3′-d]pyrrole (EHDTP, D1) and 4,8-bis((2-ethylhexyl)oxy)benzo[1,2-b:4,5-b′]dithiophene (OBDT, D2) as the terminal and central donor, and benzo[c][1,2,5]thiadiazole (BT for ICT4) and 5,6-difluorobenzo[c][1,2,5]thiadiazole (F2BT for ICT6) as the acceptor (A) moieties, are synthesized and their optical, electronic and photovoltaic properties are investigated. Both ICT4 and ICT6 have considerable solubility in various solvents and possess efficient light absorption ability [ε (×105 mol-1 cm-1) is 0.99 and 1.06, respectively for ICT4 and ICT6] and appropriate frontier molecular orbital energy offsets with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM). Bulk heterojunction solar cells (BHJSCs) are fabricated using ICT4/ICT6 and PC71BM as donors and acceptors, respectively and BHJSCs with two-step annealed (thermal followed by solvent vapor annealing) active layers of ICT4 and ICT6 show overall power conversion efficiencies (PCEs) of 5.46% and 7.91%, respectively. The superior photovoltaic performance of the ICT6 based BHJSCs is due to the favourable morphology with a nanoscale interpenetrating network in the ICT6:PC71BM active layer induced by the fluorine atoms on the BT acceptor, which significantly enhances the dissociation of excitons, charge transport and the charge collection efficiency, and suppresses bimolecular recombination in the BHJ. The observed higher PCE of 7.91% indicates that ICT6 is one of the best BT based donor material for small molecular BHJSCs.
- Busireddy, Manohar Reddy,Chereddy, Narendra Reddy,Shanigaram, Balaiah,Kotamarthi, Bhanuprakash,Biswas, Subhayan,Sharma, Ganesh Datt,Vaidya, Jayathirtha Rao
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p. 20513 - 20522
(2017/08/26)
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- A novel D2-A-D1-A-D2-type donor–acceptor conjugated small molecule based on a benzo[1,2-b:4,5-b″]dithiophene core for solution processed organic photovoltaic cells
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A novel D2-A-D1-A-D2-type donor–acceptor conjugated small molecule (DTPA-Q-BDT-Q-DTPA) with a benzo[1,2-b:4,5-b′]dithiophene (BDT) core and two D2-A arms has been synthesized and employed as electron donor for organic solar cells. Solution-processed organic photovoltaic (OPV) devices were fabricated with a configuration of ITO/PEDOT:PSS/DTPA-Q-BDT-Q-DTPA:[6,6]-phenyl-C61-butyric acid methyl ester (PC61BM)/LiF/Al. A power conversion efficiency (PCE) of 1.22% with an open-circuit voltage (VOC) of 0.64?V, a short-circuit current (JSC) of 6.10?mA?cm?2, and a fill factor (FF) of 31.0% was achieved. The PCE is 2.9 times higher than that in the other devices using D2-A-type small molecule TPA-Q-TPA as donor.
- Yu, Junting,Zhu, Weiguo,Tan, Hua,Peng, Qing
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p. 254 - 259
(2017/02/18)
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- Dithienopyrrole-benzodithiophene based donor materials for small molecular BHJSCs: Impact of side chain and annealing treatment on their photovoltaic properties
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Two small molecular organic materials denoted as ICT1 and ICT2 with A-D1-D2-D1-A architecture have been synthesized and their thermal, photo-physical, electrochemical and photovoltaic properties are explored. Synthesized materials have n-butylrhodanine acceptor (A), dithienopyrrole (DTP) (D1) and benzodithiophene (BDT) (D2) (Alkoxy BDT and alkylthiophene BDT, respectively for ICT1 and ICT2) donor moieties. Both the materials have good solubility (up to 25 mg/mL) in most common organic solvents and have excellent thermal stability with the decomposition temperature (Td) as 348 and 382 °C, respectively for ICT1 and ICT2. Both ICT1 and ICT2 have broad and intense visible region absorption (molar excitation coefficient is 1.71 × 105 and 1.65 × 105 mol?1 cm?1, respectively for ICT1 and ICT2) and have suitable HOMO and LUMO energy levels for PC71BM acceptor. Bulk heterojunction solar cells with ITO/PEDOT:PSS/blend/Al structure are fabricated using these materials. The BHJSCs fabricated by spin cast of ICT1:PC71BM and ICT2:PC71BM (1:2 wt ratio) blend from chloroform showed power conversion efficiency (PCE) of 2.77% (Jsc = 6.84 mA/cm2, Voc = 0.92 V and FF = 0.44) and 3.27% (Jsc = 7.26 mA/cm2, Voc = 0.96 V and FF = 0.47), respectively. Annealing the active layer significantly improved the PCE of these BHJSCs to 5.12% (Jsc = 10.15 mA/cm2, Voc = 0.87 V and FF = 0.58) and 5.90% (Jsc = 10.68 mA/cm2, Voc = 0.92 V and FF = 0.60), respectively for ICT1 and ICT2 donors. The enhancement in the PCE is due to higher light harvesting ability of the active layer, better nanoscale morphology for efficient and balanced charge transport and effective exciton dissociation at the donor-acceptor interface.
- Busireddy, Manohar Reddy,Mantena, Venkata Niladri Raju,Chereddy, Narendra Reddy,Shanigaram, Balaiah,Kotamarthi, Bhanuprakash,Biswas, Subhayan,Sharma, Ganesh Datt,Vaidya, Jayathirtha Rao
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p. 312 - 325
(2016/07/21)
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- A 2, 1, 3-benzothiadiazole and b thiophene derivatives and its synthetic method
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The invention discloses 2,1,3-benzothiadiazoledithiophene derivatives. The derivatives relate to 5,8-dialkylbisthiophene benzothiadiazole. A preparation method includes preparing in sequence 5,5'-dialkyl-3,3'-bithiophene, 2,7-dialkylbenzodithiophene-4,5-diketone, 2,7-dialkylbenzodithiophene-4,5-dione dioxime, 2,7-dialkyl-4,5-dihydrobenzodithiophene-2,5-diamine, adding dropwise SOCl2 into a mixture of the 2,7-dialkyl-4,5-dihydrobenzodithiophene-2,5-diamine, triethylamine and CH2Cl2, and reacting at room temperature to obtain the 5,8-dialkylbisthiophene benzothiadiazole. The derivatives have good plane regularity, heat stability and good environment adaptability. The derivatives are liable to be processed to membrane, and can be used as intermediates in synthesis for organic solar energy battery materials.
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Paragraph 0056; 0057
(2016/10/09)
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- A Diazosulfide or benzodithiophenes bridged double-boron trifluoride complex Dipyrrole methine derivative organic dye and its preparation method
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The invention discloses a benzothiadiazole or benzodithiophene-bridged, meso-thiophene or phenyl bis-boron-dipyrrolemethene (bis-BODIPY) derivative and a preparation method thereof. The benzothiadiazole or benzodithiophene-bridged, meso-thiophene or phenyl bis-BODIPY derivative has a structure represented by a formula I as shown in the description and is prepared by respectively carrying out coupling reaction on meso-thienyl or phenyl substituted BODIPY and a compound containing benzodithiophene or benzothiadiazole groups. By introducing benzodithiophene or benzothiadiazole groups into the bis-BODIPY structure, the derivative has stable photochemical property. An organic dye is simple in synthesis method, the reaction is easy to control, the yield is high and the organic dye can be efficiently synthesized and widely used in such fields as life science, analytical chemistry and environmental energy.
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Paragraph 0051-0052
(2017/02/24)
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- Fluoro monomers, oligomers, and polymers for inks and organic electronic devices
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High performance organic photovoltaic cells based on donor acceptor polymers in the active layer. A composition comprising: at least one copolymer comprising at least one first donor moiety and at least one first acceptor moiety in the copolymer backbone, wherein the first acceptor moiety comprises at least one first ring which is bivalently linked to the copolymer backbone and at least one second ring fused to the first ring and not bivalently linked to the copolymer backbone, wherein the first ring or the second ring comprises two adjacent fluoro ring substituents, and optionally, wherein the donor comprises at least one fused ring system. High efficiency, high Voc, and a combination of both can be achieved.
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Page/Page column 42-43-44
(2016/08/07)
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- Organic electronic device
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An organic electronic device may include an organic semiconductor compound represented by the following Chemical Formula 1 or Chemical Formula 2. Each substituent of the above Chemical Formulas 1 and 2 may be the same as described in the detailed description.
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- HETEROCYCLIC COMPOUND AND ORGANIC SOLAR CELL COMPRISING THE SAME
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The present specification provides a heterocyclic compound and an organic solar cell comprising the same. In addition, the present specification comprises: a first electrode; a second electrode provided opposite to the first electrode; and one or more organic material layers which are provided between the first electrode and the second electrode and include a photoactive layer.COPYRIGHT KIPO 2016
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- Syntheses and solar cell applications of conjugated copolymers containing tetrafluorophenylene units
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Novel conjugated copolymers containing tetrafluorophenylene unit have been synthesized and evaluated in bulk heterojunction solar cell. The tetrafluorophenylene unit, as the strong electron deficient moeity, has been applied for the syntheses of donor-acceptor type copolymers with a narrow-band-gap for bulk heterojunction solar cells. DTBT, tetrafluorophenylene and four types of BDT derivatives as the electron rich units were incorporated using Stille polymerization to generate PE-BDTF, PO-BDTF, PE-BDTTF and PO-BDTTF. The introduction of even 1% of tetrafluorophenylene unit substituting DTBT of BDTDTBT type of polymers results in significant decrease of the band gap of the polymers. The device with PO-BDTF:PC71BM (1:1) showed an open-circuit voltage (VOC) of 0.75 V, a short circuit current (JSC) of 11.80 mA/cm2, and a fill factor (FF) of 0.59, which yields PCE of 5.22%.
- Kim, Jinwoo,Kim, Taehyo,Kim, Nam Hee,Kim, Juae,Shim, Joo Young,Kim, Il,Chun, Ho Hwan,Kim, Jin Young,Jin, Jong Sung,Kim, Jong Pil,Jeong, Euh Duck,Suh, Hongsuk
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p. 113 - 121
(2016/01/15)
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- Thieno[3,4-b]thiophene ebenzo[1,2-b:4,5-b′]dithiophene-based polymers bearing optically pure 2-ethylhexyl pendants: Synthesis and application in polymer solar cells
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Optically active narrow-bandgap polymers ((R,R)- and (S,S)-PTB5) consisting of alternating n-octyl thieno [3,4-b]thiophene-2-carboxylate and benzo[1,2-b:4,5-b′]dithiophene units bearing optically pure (R)- and (S)-2-ethylhexyl pendants, respectively, were synthesized for the first time. (R,R)- and (S,S)-PTB5 films showed apparent circular dichroism in their absorption regions of the polymer backbone due to the formation of a chirally ordered superstructure induced by the chirality of the branched alkyl pendants. Inverted-type bulk heterojunction polymer solar cells (PSCs) were fabricated using (R,R)- or (S,S )-PTB5 as electron donors and [6,6]-phenyl-C61-butyric acid methyl ester as an electron acceptor. The photovoltaic properties of the PSCs were compared with those of the corresponding PSC containing optically inactive PTB5 bearing racemic 2-ethylhexyl pendants.
- Ikai, Tomoyuki,Kojima, Ryotaro,Katori, Sinji,Yamamoto, Tomoyuki,Kuwabara, Takayuki,Maeda, Katsuhiro,Takahashi, Kohshin,Kanoh, Shigeyoshi
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p. 171 - 177
(2015/03/03)
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- UNIMOLECULAR AND ORGANIC SOLAR CELL COMPRISING THE SAME
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Provided are a single molecule and an organic solar cell including the single molecule. Specifically, the single molecule has an end represented by chemical formula 1 and includes at least two units selected from the group consisting of units represented by chemical formula 2, wherein the two units are the same or different from each other.COPYRIGHT KIPO 2015
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- Polymer solar cells based on quinoxaline and dialkylthienyl substituted benzodithiophene with enhanced open circuit voltage
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A poly[benzodithiophene-alt-di-2-thienyl-quinoxaline] series (PBDTDPQ-EH, PBDTDPQ-OD, and PBDTDPQ-HDT) was synthesized via Stille coupling. Deep highest occupied molecular orbital (HOMO) levels were achieved by the introduction of 2-decyl-4-hexyl-thiophen-yl (HDT) side chains. The introduction of the various side chains increased the molecular weight of the polymers, and the polymers dissolved well in common organic solvents at room temperature. The HOMO energy level (-5.20 to -5.49 eV) decreased because of the 2D conjugated structure. X-ray diffraction analysis showed that PBDTDPQ-OD had a slightly edge-on structure. In the case of PBDTDPQ-HDT, however, the structure was amorphous due to the thiophene side chain, and the extent of π stacking increased. After fabricating bulk-heterojunction-type polymer solar cells, the OPV characteristics were evaluated. The values of open-circuit voltage (V oc), short-circuit current (Jsc), fill factor, and power conversion efficiency (PCE) were 0.88 V, 7.9 mA cm-2, 45.4%, and 3.2%, respectively.
- Song, Kwan Wook,Lee, Tae Ho,Ko, Eui Jin,Back, Kyung Hun,Moon, Doo Kyung
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p. 1028 - 1036
(2014/03/21)
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- Importance of the Donor:Fullerene intermolecular arrangement for high-efficiency organic photovoltaics
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The performance of organic photovoltaic (OPV) material systems are hypothesized to depend strongly on the intermolecular arrangements at the donor:fullerene interfaces. A review of some of the most efficient polymers utilized in polymer:fullerene PV devices, combined with an analysis of reported polymer donor materials wherein the same conjugated backbone was used with varying alkyl substituents, supports this hypothesis. Specifically, the literature shows that higher-performing donor-acceptor type polymers generally have acceptor moieties that are sterically accessible for interactions with the fullerene derivative, whereas the corresponding donor moieties tend to have branched alkyl substituents that sterically hinder interactions with the fullerene. To further explore the idea that the most beneficial polymer:fullerene arrangement involves the fullerene docking with the acceptor moiety, a family of benzo[1,2-b:4,5-b]dithiophene-thieno[3,4-c]pyrrole-4,6-dione polymers (PBDTTPD derivatives) was synthesized and tested in a variety of PV device types with vastly different aggregation states of the polymer. In agreement with our hypothesis, the PBDTTPD derivative with a more sterically accessible acceptor moiety and a more sterically hindered donor moiety shows the highest performance in bulk-heterojunction, bilayer, and low-polymer concentration PV devices where fullerene derivatives serve as the electron-accepting materials. Furthermore, external quantum efficiency measurements of the charge-transfer state and solid-state two-dimensional (2D) 13C{1H} heteronuclear correlation (HETCOR) NMR analyses support that a specific polymer:fullerene arrangement is present for the highest performing PBDTTPD derivative, in which the fullerene is in closer proximity to the acceptor moiety of the polymer. This work demonstrates that the polymer:fullerene arrangement and resulting intermolecular interactions may be key factors in determining the performance of OPV material systems.
- Graham, Kenneth R.,Cabanetos, Clement,Jahnke, Justin P.,Idso, Matthew N.,El Labban, Abdulrahman,Ngongang Ndjawa, Guy O.,Heumueller, Thomas,Vandewal, Koen,Salleo, Alberto,Chmelka, Bradley F.,Amassian, Aram,Beaujuge, Pierre M.,McGehee, Michael D.
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p. 9608 - 9618
(2014/07/22)
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- PROCESS FOR PRODUCING FUSED-RING AROMATIC COMPOUND, AND CONJUGATED POLYMER
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The invention addresses a problem of purifying a monomer to be a precursor according to a simpler and milder method so as to obtain a polymer having a higher molecular weight. The invention relates to a method for producing a condensed polycyclic aromatic compound having n active groups (wherein n is an integer of 1 or more and 4 or less), which comprises bringing a composition containing the condensed polycyclic aromatic compound and a solvent into contact with zeolite.
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Paragraph 0213; 0214; 0215; 0216; 0217; 0220; 0225; 0226
(2014/09/29)
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- Effect of extended conjugation on the optoelectronic properties of benzo[1,2-d:4,5-d′]bisoxazole polymers
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Four copolymers comprising benzo[1,2-d:4,5-d']bisoxazole (BBO) and benzo[1,2-b:4,5-b′]dithiophene (BDT) bearing phenylethynyl substituents on either the BBO, BDT moieties or both units were synthesised and the influence of two-dimensional conjugation on their optoelectronic properties investigated. Extending conjugation along the BBO resulted in a 0.5eV decrease in the LUMO level, whereas the HOMO level was raised by 0.2eV. Extending conjugation across the BDT moiety in also resulted in a 0.5eV decrease in the LUMO level, however, the effect was negligible on the HOMO level. Thus, cross-conjugation can be used to independently tune the LUMO level within these systems. CSIRO 2014.
- Tlach, Brian C.,Tomlinson, Aimee L.,Morgan, Kiley D.,Collins, Christopher R.,Zenner, Michael D.,Jeffries-El, Malika
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p. 711 - 721
(2014/06/09)
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- Synthesis and characterization of organic semiconducting polymers containing dithienylfluorenone for use in organic photovoltaic cells
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2,7-Bis(5-bromo-4-hexylthiophen-2-yl)-9H-fluoren-9-one (DTFO) was synthesized as a new electron-accepting material in semiconducting polymers for use in photovoltaic devices. The synthesized DTFO was polymerized with two different electron-donating counter monomers:2,7-dibromo-9,9-dioctyl-9H-fluorene (DOF) and 2,6-bis(trimethyltin)-4,8-di(2-ethylhexyloxyl)benzo [1,2-b:4,5-b']dithiophene (BDT). Two alternating copolymers, poly(DTFO-alt-DOF) and poly(DTFOalt-BDT), were synthesized through the Suzuki and Stille coupling polymerizations, respectively. The synthesized polymers exhibited good solubility in common solvents and show good thermal stability up to 350 °C. The optical band gap energies of poly(DTFO-alt-DOF) and poly(DTFO-alt-BDT) were determined to be 2.44 and 2.23 eV, respectively. The positions of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of the polymers were determined by cyclic voltammetry (CV). One of these devices showed a power conversion efficiency of 0.50%, with an open-circuit voltage of 0.67 V, a short-circuit current of 2.34 mA/cm2, and a fill factor of 0.30 under air mass (AM) 1.5 global (1.5 G) illumination conditions (100 mW/cm2). Copyright
- Byun, Yun-Sun,Kim, Ji-Hoon,Park, Jong Baek,Hwang, Do-Hoon
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p. 6038 - 6042
(2014/12/09)
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- Synthesis and photovoltaic performances of benzo[1,2-b:4,5-b']dithiophene- alt-2,3-diphenylquinoxaline copolymers pending functional groups in phenyl rings
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Two donor/acceptor (D/A)-based benzo[1,2-b:4,5-b′]dithiophene-alt-2, 3-biphenyl quinoxaline copolymers of P1 and P2 were synthesized pending different functional groups (thiophene or triphenylamine) in the 4-positions of phenyl rings. Their thermal, photo
- Tan, Hua,Deng, Xianping,Yu, Junting,Chen, Jianhua,Nie, Kaixuan,Huang, Ying,Liu, Yu,Wang, Yafei,Zhu, Meixiang,Zhu, Weiguo
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p. 1051 - 1057
(2013/08/24)
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- A family of donor-acceptor photovoltaic polymers with fused 4,7-dithienyl-2,1,3-benzothiadiazole units: Effect of structural fusion and side chains
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A new optoelectronic building block, dithieno[3′,2′:3, 4;2″,3″:5,6]benzo[1,2-c][1,2,5]thiadiazole, was designed by applying a fusion strategy on 4,7-dithienyl-2,1,3-benzothiadazole (DTBT) and named as fDTBT. In combination with benzo[1,2-b:4,5-b′]dithiophene (BDT), fDTBT was used for the construction of a family of donor-acceptor copolymers, P(BDT n-fDTBT), with different side chains (n is carbon number of the side chain and varies from 8, 10, 12, 16, 20, to 24). It was found that the side chains have great impact on processing and photovoltaic properties of the polymers. P(BDTn-fDTBT) (n = 8, 10, and 12) bearing small alkyl side chains show poor solubility even in hot solvents. P(BDTn-fDTBT) (n = 20 and 24) have good solubility but inferior photovoltaic performance with an efficiency of 1.04% and 0.49%, respectively. Only P(BDT16-fDTBT) having 2-hexyldecyl side chain possesses both suitable solution processability and good photovoltaic properties with an efficiency around 4.36%. The comparison between P(BDT16-fDTBT) with the nonfused reference polymer P(BDT20-DTBT) reveals that the structural fusion on DTBT endows the polymer a deeper HOMO energy level and a better film morphology when blending with [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM), finally resulting in improved photovoltaic performance.
- Mei, Chong-Yu,Liang, Long,Zhao, Fu-Gang,Wang, Jin-Tu,Yu, Lin-Feng,Li, Yu-Xue,Li, Wei-Shi
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p. 7920 - 7931
(2013/10/22)
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- SEMICONDUCTING COMPOUNDS AND DEVICES INCORPORATING SAME
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Disclosed are molecular and polymeric compounds having desirable properties as semiconducting materials. Such compounds can exhibit desirable electronic properties and possess processing advantages including solution-processability and/or good stability. Organic transistor and photovoltaic devices incorporating the present compounds as the active layer exhibit good device performance.
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Page/Page column 37;42
(2012/10/08)
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- FLUORO MONOMERS, OLIGOMERS, AND POLYMERS FOR INKS AND ORGANIC ELECTRONIC DEVICES
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High performance organic photovoltaic cells based on donor acceptor polymers in the active layer. A composition comprising: at least one copolymer comprising at least one first donor moiety and at least one first acceptor moiety in the copolymer backbone, wherein the first acceptor moiety comprises at least one first ring which is bivalently linked to the copolymer backbone and at least one second ring fused to the first ring and not bivalently linked to the copolymer backbone, wherein the first ring or the second ring comprises two adjacent fluoro ring substituents, and optionally, wherein the donor comprises at least one fused ring system. High efficiency, high Voc, and a combination of both can be achieved.
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- A copolymer based on benzo[1,2-b:4,5-b′]dithiophene and quinoxaline derivative for photovoltaic application
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A D-A-D copolymer (PBDTQx) with a bandgap of 1.78 eV, containing alkoxy-substituted benzo[1,2-b:4,5-b′]dithiophene (BDT) as donor and quinoxaline derivative (Qx) as acceptor, was synthesized by Stille coupling reaction. In order to study the photovoltaic property of PBDTQx, polymer solar cells (PSCs) were fabricated with PBDTQx as the electron donor blended with [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) as the electron acceptor. The power conversion efficiency (PCE) of PSC was 1.01% for an optimized PBDTQx: PC61BM ratio of 1:5, under the illumination of AM 1.5, 100 mW/cm2. The results indicated that PBDTQx was a promising donor candidate in the application of polymer solar cells.
- Wu, Haimei,Qu, Bo,Cong, Zhiyuan,Liu, Hongli,Tian, Di,Gao, Bowen,An, Zhongwei,Gao, Chao,Xiao, Lixin,Chen, Zhijian,Liu, Huanhuan,Gong, Qihuang,Wei, Wei
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p. 897 - 903
(2012/10/30)
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- ORGANIC ELECTRONIC DEVICES AND POLYMERS, INCLUDING PHOTOVOLTAIC CELLS AND DIKETONE-BASED POLYMERS
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Polymers which can be used in p-type materials for organic electronic devices and photovoltaic cells. Compounds, monomers, dimers, trimers, and polymers comprising formula (I); Good photovoltaic efficiency and lifetime can be achieved. The R group can provide solubility, environmental stability, and fine tuning of spectroscopic and/or electronic properties. Different polymer microstructures can be prepared which encourage multiple band gaps and broad and strong absorptions. The carbonyl can interact with adjacent thiophene rings to provide backbone with rigidity, induce planarity, and reduce and/or eliminate intramolecular chain twisting defects. Polymers comprising benzodithiophene and/or benzothiadiazole structures can show particularly high performance.
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Page/Page column 50
(2011/04/14)
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- Highly efficient solar cell polymers developed via fine-tuning of structural and electronic properties
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This paper describes synthesis and photovoltaic studies of a series of new semiconducting polymers with alternating thieno[3,4-b]thiophene and benzodithiophene units. The physical properties of these polymers were finely tuned to optimize their photovoltaic effect. The substitution of alkoxy side chains to the less electron-donating alkyl chains or introduction of electron-withdrawing fluorine into the polymer backbone reduced the HOMO energy levels of polymers. The structural modifications optimized polymers' spectral coverage of absorption and their hole mobility, as well as miscibility with fulleride, and enhanced polymer solar cell performances. The open circuit voltage, Voc, for polymer solar cells was increased by adjusting polymer energy levels. It was found that films with finely distributed polymer/fulleride interpenetrating networkexhibited improved solar cell conversion efficiency. Efficiency over 6p ercent has been achieved in simple solar cells based on fluorinated PTB4/PC61BM films prepared from mixed solvents. The results proved that polymer solar cells have a bright future.
- Liang, Yongye,Feng, Danqin,Wu, Yue,Tsai, Szu-Ting,Li, Gang,et al.
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p. 7792 - 7799
(2009/10/17)
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