期刊
POLYMER CHEMISTRY
卷 7, 期 36, 页码 5730-5738出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6py01083k
关键词
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资金
- European Commission [604148]
- Dutch Polymer Institute (DPI) [734]
- European Research Council under the European Union's Seventh Framework Programme (FP)/ERC Grant [339031]
- Ministry of Education, Culture and Science [024.001.035]
We investigate the effect of introducing thiazole pi-spacers in wide bandgap semiconducting copolymers based on benzothiadiazole with either benzodithiophene or indacenodithiophene. Thiazole-containing polymers show similar optical bandgaps but drastically downshifted frontier orbital levels compared to the corresponding thiophene derivatives as a result of the more electronegative imine nitrogen. Consequently, they provide an enhanced open-circuit voltage (V-OC) of about 0.2 V in bulk heterojunction polymer solar cells. Notably, the V-OC approaches 0.95 V for polymers with an optical bandgap below 1.75 eV. Despite the favourable energetics, the performance of the thiazole-containing polymers in solar cells is currently restricted by the relatively low molecular weight, which results in a sub-optimal bulk heterojunction morphology.
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