1638802-04-6Relevant articles and documents
Photovoltaic Blend Microstructure for High Efficiency Post-Fullerene Solar Cells. To Tilt or Not to Tilt?
Aldrich, Thomas J.,Alzola, Joaquin M.,Delongchamp, Dean M.,Fabiano, Simone,Facchetti, Antonio,Huang, Wei,Kohlstedt, Kevin L.,Logsdon, Jenna Leigh,Marks, Tobin J.,Matta, Micaela,Melkonyan, Ferdinand S.,Mukherjee, Subhrangsu,Powers-Riggs, Natalia,Schatz, George C.,Strzalka, Joseph W.,Swick, Steven M.,Timalsina, Amod,Wang, Gang,Wasielewski, Michael R.,Yang, Tony,Young, Ryan M.
, (2019)
Achieving efficient polymer solar cells (PSCs) requires a structurally optimal donor-acceptor heterojunction morphology. Here we report the combined experimental and theoretical characterization of a benzodithiophene-benzothiadiazole donor polymer series (PBTZF4-R; R = alkyl substituent) blended with the non-fullerene acceptor ITIC-Th and analyze the effects of substituent dimensions on blend morphology, charge transport, carrier dynamics, and PSC metrics. Varying substituent dimensions has a pronounced effect on the blend morphology with a direct link between domain purity, to some extent domain dimensions, and charge generation and collection. The polymer with the smallest alkyl substituent yields the highest PSC power conversion efficiency (PCE, 11percent), reflecting relatively small, high-purity domains and possibly benefiting from matched donor polymer-small molecule acceptor orientations. The distinctive morphologies arising from the substituents are investigated using molecular dynamics (MD) simulations which reveal that substituent dimensions dictate a well-defined set of polymer conformations, in turn driving chain aggregation and, ultimately, the various film morphologies and mixing with acceptor small molecules. A straightforward energetic parameter explains the experimental polymer domain morphological trends, hence PCE, and suggests strategies for substituent selection to optimize PSC materials morphologies.
A Facile Synthesized Polymer Featuring B-N Covalent Bond and Small Singlet-Triplet Gap for High-Performance Organic Solar Cells
Pang, Shuting,Wang, Zhiqiang,Yuan, Xiyue,Pan, Langheng,Deng, Wanyuan,Tang, Haoran,Wu, Hongbin,Chen, Shanshan,Duan, Chunhui,Huang, Fei,Cao, Yong
supporting information, p. 8813 - 8817 (2021/03/16)
High-efficiency organic solar cells (OSCs) largely rely on polymer donors. Herein, we report a new building block BNT and a relevant polymer PBNT-BDD featuring B-N covalent bond for application in OSCs. The BNT unit is synthesized in only 3 steps, leading to the facile synthesis of PBNT-BDD. When blended with a nonfullerene acceptor Y6-BO, PBNT-BDD afforded a power conversion efficiency (PCE) of 16.1 % in an OSC, comparable to the benzo[1,2-b:4,5-b′]dithiophene (BDT)-based counterpart. The nonradiative recombination energy loss of 0.19 eV was afforded by PBNT-BDD. PBNT-BDD also exhibited weak crystallinity and appropriate miscibility with Y6-BO, benefitting of morphological stability. The singlet–triplet gap (ΔEST) of PBNT-BDD is as low as 0.15 eV, which is much lower than those of common organic semiconductors (≥0.6 eV). As a result, the triplet state of PBNT-BDD is higher than the charge transfer (CT) state, which would suppress the recombination via triplet state effectively.
Dibromo compounds containing thiophene and thiazolo[4,5,b]thiazole structure and preparation method thereof
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Paragraph 0062-0064, (2020/07/02)
The invention belongs to the technical field of organic synthesis, and discloses dibromo compounds containing thiophene and thiazolo[4,5,b]thiazole structures and a preparation method of the dibromo compound. By utilizing the preparation method, the dibromo compounds containing thiophene and thiazolo[4,5,b]thiazole structures can be obtained, the yield of the dibromo compounds reaches up to 99%, and an effective basic preparation material is provided for conjugated polymers PTZ1. Meanwhile, the structures of representative dibromo compounds containing thiophene and thiazolo[4,5,b]thiazole structures, such as 5a, 6a, are confirmed, and structural characterization is carried out.
C(SP3)-C(SP2) CROSS-COUPLING REACTION OF ORGANOZINC REAGENTS AND HETEROCYCLIC (PSEUDO)HALIDES
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Paragraph 99; 100, (2018/02/28)
Provided is a method of synthesizing a C(sp3)-C(sp2) cross-coupled compound comprising reacting a C(sp3) coupling partner with a C(sp2) coupling partner, a catalyst, and a solvent; wherein the C(sp3) coupling partner comprises an organic zinc reagent; and wherein the C(sp2) coupling partner comprises a heterocyclic halide or a heterocyclic pseudo halide. The method further comprises synthesis of the organic zinc reagent, wherein the synthesis comprises reacting a zinc powder with an acid, filtering, washing, and drying to obtain an activated zinc powder; and reacting the activated zinc powder with a metal iodide catalyst and a second solvent and heating for a predetermined time to obtain the organic zinc reagent.
AN ELECTRON-DONATING UNIT, A COPOLYMER THEREOF AND THEIR PREPARATION METHODS, AS WELL AS THEIR USES
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, (2017/09/27)
An electron-donating unit of the Formula, a copolymer thereof and their preparation methods, as well as their uses in thin-film transistor or polymer solar cell. The electron-donating unit is an effective building block for constructing high-performance polymer semiconductors due to its solubilizing ability, centrosymmetric geometry, backbone planarity, compact packing, and appropriate electron donating ability versus the previously reported BTOR and DTP units.
