- Side chain effect on poly(beznodithiophene-co-dithienobenzoquinoxaline) and their applications for polymer solar cells
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Two conjugated polymers (PBDT86-TQ and PBDT88-TQ) with different side chains, but with the same polymer backbone, have been prepared for polymer solar cells. The side chains in the two polymers induced different steric hindrance. PBDT86-TQ showed the 0-0 absorption peak at ~740 nm, and it was blue-shifted to ~660 nm for PBDT88-TQ as a result of strong steric hindrance from two dioctyl chains. Further, the HOMO energy levels of PBDT86-TQ (-5.10 eV) and PBDT88-TQ (-5.54 eV) also showed a large difference. The hole mobility of PBDT88-TQ is ~70 times higher than that of PBDT86-TQ. The photovoltaic cells based on PBDT86-TQ gave a very low PCE of 0.69-0.80%, and for PBDT88-TQ-based cells, the PCEs were improved to 3.70-4.50% with a Voc of up to 0.98 V and improved Jsc and FF. These results show the importance of side chains on the design of conjugated polymers for high performance polymer solar cells.
- Fan, Jingzhe,Zhang, Yong,Lang, Caili,Qiu, Meng,Song, Jinsheng,Yang, Renqiang,Guo, Fengyun,Yu, Qingjiang,Wang, Jinzhong,Zhao, Liancheng
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- Compound based on benzo [1, 2-b: 4, 5-b '] dithiophene and preparation method thereof
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The present invention provides a compound based on benzo [1, 2-b: 4, 5-b '] dithiophene, the compound has a structure represented by a formula (I), R1 is-CH, R2 is-CH, and n is aneven number selected from 1-20. The invention also provides a preparation method of the compound based on benzo [1, 2-b: 4, 5-b '] dithiophene. In a compound system provided by the invention, pi electrons have a larger delocalization range, so that pi-pi stacking between molecules can be better realized, charge transmission is facilitated, and the open-circuit voltage and the photoelectric conversion efficiency oforganic small-molecule solar cells based on the compound can be effectively improved. And the preparation method is simple, efficient and high in yield.
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- Solution-processed and high-performance organic solar cells using small molecules with a benzodithiophene unit
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Three small molecules named DR3TBDTT, DR3TBDTT-HD, and DR3TBD2T with a benzo[1,2-b:4,5-b′]dithiophene (BDT) unit as the central building block have been designed and synthesized for solution-processed bulk-heterojunction solar cells. Power conversion efficiencies (PCEs) of 8.12% (certified 7.61%) and 8.02% under AM 1.5G irradiation (100 mW cm-2) have been achieved for DR3TBDTT- and DR3TBDT2T-based organic photovoltaic devices (OPVs) with PC 71BM as the acceptor, respectively. The better PCEs were achieved by improving the short-circuit current density without sacrificing the high open-circuit voltage and fill factor through the strategy of incorporating the advantages of both conventional small molecules and polymers for OPVs.
- Zhou, Jiaoyan,Zuo, Yi,Wan, Xiangjian,Long, Guankui,Zhang, Qian,Ni, Wang,Liu, Yongsheng,Li, Zhi,He, Guangrui,Li, Chenxi,Kan, Bin,Li, Miaomiao,Chen, Yongsheng
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p. 8484 - 8487
(2013/07/19)
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