期刊
MATERIALS CHEMISTRY FRONTIERS
卷 1, 期 4, 页码 749-756出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6qm00194g
关键词
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资金
- National Natural Science Foundation of China [21572171]
- National Basic Research Program of China (973 Program) [2013CB834805]
- Innovative Research Group of Hubei Province [2015CFA014]
- International Science & Technology Cooperation Program of China [2014DFA52820]
Perylene bisimide (PBI) based molecules have recently attracted tremendous interest as acceptors in non-fullerene organic solar cells. However, most PBI-based acceptors possess deep LUMO energy levels (-3.9 similar to -4.0 eV) and show an open-circuit voltage (V-oc) below 0.90 V, thus limiting the improvement of device efficiency. Here, we report two novel ring-fused PBI dimers, SdiPBI-BT and diPBI-BT, with thienobenzene fused to the bay region of the PBI subunits. Conventional bulk-heterojunction (BHJ) solar cells based on SdiPBI-BT show a power conversion efficiency (PCE) of 6.71% with a high V-oc value of 0.95 V, a short-circuit current density (J(sc)) of 10.31 mA cm(-2) and a high fill factor (FF) of 68.7%. Devices based on diPBI-BT show a PCE of 5.84% with a high V-oc value of 0.99 V. These results demonstrate that ring-fused PBI derivatives are promising materials for non-fullerene cells.
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