1132711-33-1Relevant articles and documents
Novel dual acceptor (D-D′-A′-π-A) dye-sensitized solar cells based on the triarylamine structure and benzothiadiazole double electron withdrawing unit
Zheng, Peijin,Xu, Jian,Peng, Fei,Peng, Shengming,Liao, Junxu,Zhao, Hongbin,Li, Ledong,Zeng, Xiangyan,Yu, Heyu
, p. 4443 - 4452 (2021)
Three novel D-D′-A′-π-A type organic dyes (BT4,BT5andBT6) based on aniline derivatives (containing fluorene, carbazole and phenothiazine segments as D′) and formic acid as anchoring groups have been synthesized for dye-sensitized solar cells (DSCs). To fine-tune absorption spectra, energy levels, and photovoltaic properties of these dyes, an auxiliary electron-withdrawing benzothiadiazole (BT) unit was introduced into their backbones. It was found that dyeBT5with a carbazole containing triarylamine as the electron-donating unit exhibits a broader absorption profile, higher molar extinction coefficient and better photovoltaic performance than those ofBT4andBT6. The power conversion efficiency (PCE) of theBT5-based DSC was up to 3.61%. This implied that the incorporation of the BT unit can cause a pronounced electron transfer effect with triarylamine segments, and therefore affect the absorption bands, Stokes shifts and PCE of DSCs.
Influence of the additional electron-withdrawing unit in β-functionalized porphyrin sensitizers on the photovoltaic performance of dye-sensitized solar cells
Lu, Futai,Feng, Yaqing,Wang, Xuexiang,Zhao, Yanming,Yang, Guang,Zhang, Jie,Zhang, Bao,Zhao, Zhixin
, p. 255 - 263 (2017)
The β-functionalized porphyrin containing an additional electron-withdrawing unit, 2,3-diphenylquinoxaline(DPQ) for LP-5 or 2,1,3-benzothiadiazole (BTD) for LP-6 with different electron-withdrawing abilities, between the porphyrin core and the anchoring group and the reference porphyrin dye (LP-4) have been designed and synthesized for DSCs. The influence of the additional electron-withdrawing units on molecular properties as well as photovoltaic performance of the corresponding DSCs was investigated systematically. Compared with LP-4, the introduction of additional electron-deficient unit at the porphyrin β π-linker in LP-5 and LP-6 decreases the lowest unoccupied molecular orbital (LUMO) energy levels, resulting in the broader absorption spectra and significantly improved IPCE spectra in the region 350–500 nm, which ensures the better light-harvesting properties and the higher short-circuit current density (Jsc). On the other hand, the introduction of additional acceptors of LP-5 and LP-6 induces dye aggregation and reduces the lifetime of the charge–separated states, which decreases the open–circuit voltage (Voc). Interestingly, the loss in Voc is overcompensated by the improvement in Jsc. The study provides not only an alternative approach to design novel porphyrin sensitizers, but also an insight into how to manipulate the LUMO energy levels of porphyrin sensitizers via the β-linker modifications for the optimal photovoltaic applications.
Novel porphyrin-preparation, characterization, and applications in solar energy conversion
Lu, Jianfeng,Li, Hao,Liu, Shuangshuang,Chang, Yu-Cheng,Wu, Hui-Ping,Cheng, Yibing,Diau, Eric Wei-Guang,Wang, Mingkui
, p. 6885 - 6892 (2016)
Porphyrins have been demonstrated as one of the most efficient sensitizers in dye-sensitized solar cells (DSSC). Herein, we investigated a series of porphyrin sensitizers functionalized with various π-spacers, such as phenyl for LD14, thiophene for LW4, thiophene-phenyl for LW5, and 2,1,3-benzothiadiazole (BTD)-phenyl for LW24. Photo-physical investigation by means of time-resolved fluorescence and nanosecond transient absorption spectroscopy revealed an accelerated inner charge transfer in porphyrins containing the BTD-phenyl π-spacer. Implementation of an auxiliary electron-deficient BTD unit to the porphyrin spacer also results in a broad light-harvesting ability extending up to 840 nm, contributing to an enhanced charge transfer character from the porphyrin ring to the anchoring group. When utilized as a sensitizer in DSSCs, the LW24 device achieved a power conversion efficiency of 9.2%, higher than those based on LD14 or LW5 porphyrins (PCE 9.0% or 8.2%, respectively) but lower than that of the LW4 device (PCE 9.5%). Measurements of transient photovoltage decays demonstrate that the LW24 device features the up-shifted potential band edge of the conduction band of TiO2, but involves serious charge recombination in the dye/TiO2 interface. The findings provide insights into the molecular structure and the charge-transfer characteristics for designing efficient porphyrin sensitizers for DSSC applications.
A large, ultra-black, efficient and cost-effective dye-sensitized solar module approaching 12% overall efficiency under 1000 lux indoor light
Tsai, Ming-Chi,Wang, Chin-Li,Chang, Chiung-Wen,Hsu, Cheng-Wei,Hsiao, Yu-Hsin,Liu, Chia-Lin,Wang, Chen-Chi,Lin, Shr-Yau,Lin, Ching-Yao
, p. 1995 - 2003 (2018)
Three novel anthracene-based organic dyes, denoted as AN-11, AN-12 and AN-14, were synthesized for outdoor and indoor dye-sensitized solar cell studies. Laboratory-fabricated small cells, as well as rigid and flexible modules, were prepared and analyzed for their photovoltaic performance under simulated outdoor and indoor conditions. Owing to the panchromatic absorption of visible light, the AN-11 module gives rise to a very black color and superior photovoltaic performance. Significantly, the AN-11 rigid module with a large active area of 26.80 cm2 outperforms its Z907 counterpart under indoor conditions, reaching an overall efficiency of 11.94% under 1000 lux of T5 fluorescent light. In addition, the AN-11 module exhibits good stability during weather stress tests. Finally, the AN-11 dye is cost-effective and our studies show that the photovoltaic performance of the solar cells is not affected upon lowering the synthetic cost and increasing the synthetic scale.
Phenoxazinyl zinc porphyrin dye and preparation method thereof
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Paragraph 0017; 0022, (2021/04/10)
The invention discloses a phenoxazinyl zinc porphyrin dye and a preparation method thereof. Phenoxazine is used as a D unit to be connected with a zinc porphyrin core, a benzene ring is used as a bridging (pi) unit, carboxylic acid is used as an electron withdrawing (A) unit, and benzothiadiazole containing triple bonds is inserted between the zinc porphyrin core and the pi unit, so that the planarity of dye molecules is increased, the transition energy level of electrons in the molecules is adjusted, and the absorption spectrum is broadened. According to the synthetic route of the phenoxazinyl zinc porphyrin dye provided by the invention, the prepared phenoxazinyl zinc porphyrin dye has relatively good absorption on sunlight in a visible light region. Good application potential is realized in the DSSC.
