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Side-Chain Effects on Energy-Level Modulation and Device Performance of Organic Semiconductor Acceptors in Organic Solar Cells.
ACS Applied Materials & Interfaces 2017 October 5
Two new non-fullerene acceptors, IDTC and IDTO, were designed and synthesized for the application in organic solar cells (OSCs). Compared with IDTC, the introduction of electron-donating alkoxy groups of IDTO leads to a higher LUMO level with a slightly blue-shifted absorption. Using the polymer PBDB-T as donor and the two small molecules as acceptors in the conventional device structure, the IDTC-based OSC exhibits a power conversion efficiency (PCE) of 9.35% with an open-circuit voltage (VOC ) of 0.917 V, a short-circuit current density (JSC ) of 16.56 mA cm-2 , and a fill factor (FF) of 61.61%. For the OSC based on IDTO, a higher PCE of 10.02% with a VOC of 0.943 V, a JSC of 16.25 mA cm-2 , and an FF of 65.41% are obtained. The more balanced μe /μh , evident aggregation, and phase separation contribute to the higher FF for the device based on IDTO. The increased JSC for the device based on PBDB-T:IDTC can be attributed to the red-shifted and stronger absorption of the PBDB-T:IDTC blend film. These results indicate fine-tuning the electronic energy and absorption of non-fullerene acceptors is feasible to improve the performance of OSCs.
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