Fluorine substituted thiophene-quinoxaline copolymer to reduce the HOMO level and increase the dielectric constant for high open-circuit voltage organic solar cells
Lu, Y; Xiao, Z; Yuan, Y; Wu, H; An, Z; Hou, Y; Gao, C; Huang, J
| HERO ID | 3860767 |
|---|---|
| In Press | No |
| Year | 2013 |
| Title | Fluorine substituted thiophene-quinoxaline copolymer to reduce the HOMO level and increase the dielectric constant for high open-circuit voltage organic solar cells |
| Authors | Lu, Y; Xiao, Z; Yuan, Y; Wu, H; An, Z; Hou, Y; Gao, C; Huang, J |
| Volume | 1 |
| Issue | 4 |
| Page Numbers | 630-637 |
| Abstract | This study reported a novel fluorinated copolymer (FTQ) and shown it to exhibit a significantly higher open circuit voltage (V-OC) 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 V-OC. The highest V-OC 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. |
| Doi | 10.1039/c2tc00327a |
| Wosid | WOS:000314803400005 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Journal:JOURNAL OF MATERIALS CHEMISTRY C 2050-7526 |
| Is Public | Yes |