期刊
SOLAR RRL
卷 1, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201700123
关键词
polymer solar cells; non-fullerene acceptors; perylene diimides; open-circuit voltage
资金
- National Science Foundation of China [21325416, 51573140, 21674007]
- National Fundamental Key Research Program [2013CB834701]
Great efforts have been devoted to seeking alternative non-fullerene acceptors for efficient polymer solar cells (PSCs). Achieving a high open-circuit voltage (V-oc) is quite challenging but is essential for practical application. Here, pyrene-fused perylene diimide was first used as a periphery building block to construct non-fullerene acceptors. Due to the high-lying lowest unoccupied molecular orbitals (LUMOs) as well as balanced transport properties, the normal devices with the acceptors exhibited ultrahigh V-oc values of up to 1.26 V. In addition, the achieved power-conversion efficiency (PCE) of 5.10% is among the highest values for non-fullerene PSCs with a V-oc > 1.20 V, indicating that the pyrene-fused perylene diimide (PDI) unit is a useful building block for the design of non-fullerene PSCs with high V-oc values. This study could benefit the realization of both a high PCE and V-oc in PSCs.
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