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Fluorine substituted thiophene–quinoxaline copolymer to reduce the HOMO level and increase the dielectric constant for high open-circuit voltage organic solar cells
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lu, Yunzhang Xiao, Zhengguo Yuan, Yongbo Wu, Haimei An, Zhongwei Hou, Yanbing Gao, Chao Huang, Jinsong |
| Copyright Year | 2013 |
| Abstract | This study reported a novel fluorinated copolymer (FTQ) and shown it to exhibit a significantly higher open circuit voltage (VOC) in bulk heterojunction solar cells with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) compared to the low band-gap polymer Thiophene–Quinoxaline (TQ). Fluorination lowers the polymer HOMO level effectively which pushes down the highest occupied molecular orbital (HOMO) level of the TQ from −5.36 eV to −5.51 eV and increases the relative dielectric constant from 4.2 to 5.5, resulting in a high VOC. The highest VOC of 950 mV was achieved in the FTQ/PCBM solar cell device. For these optimized blends, the device made of FTQ:PC71BM with a 1 : 1 weight ratio yielded a high power conversion efficiency of 5.3% after a very short time thermal annealing process. These findings will be of importance for achieving high-performance of polymer solar cells by functional group substitution in low band gap polymers. |
| Starting Page | 630 |
| Ending Page | 637 |
| Page Count | 8 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C2TC00327A |
| Volume Number | 1 |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/tc/c2/c2tc00327a/c2tc00327a.pdf |
| Alternate Webpage(s) | http://www.huanggroup.unl.edu/Articles/2013%20Articles/2013-2%20Flourine.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/C2TC00327A |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
