期刊
ORGANIC ELECTRONICS
卷 41, 期 -, 页码 166-172出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2016.10.044
关键词
Organic solar cell; Non-fullerene acceptors; Star-shape compound; Annulated perylene diimides
资金
- National Natural Science Foundation of China (NSFC) [21572171, 91433201]
- National Basic Research Program of China (973 Program) [2013CB834805]
- Innovative Research Group of Hubei Province [2015CFA014]
- International Science AMP
- Technology Cooperation Program of China [2014DFA52820]
Three novel star-shaped S/Se-annulated perylene diimide (PDI) small molecule acceptors with triphe-nylamine as the core, namely TPA-PDI, TPA-PDI-S and TPA-PDI-Se, were designed and synthesized. Using the wideband-gap polymer PDBT-T1 as the donor and Se-annulated perylene diimide (TPA-PDI-Se) as the acceptor, power conversion efficiencies (PCE) of up to 6.10% was achieved, which is 38% higher than the reference of TPA-PDI without heteroatom annulation. Impressively, the S/Se-annulated perylene diimides as acceptors showed high open-circuit voltage (V-OC) of 1.00 V. The high efficiency for TPA-PDI-Se can be attributed to complementary absorption spectra with the donor material, relatively high-lying LUMO level, balanced carrier transport and favorable morphologies. To the best of our knowledge, this PCE of 6.10% is among the highest values based on star-shaped non-fullerene acceptors so far. (C) 2016 Elsevier B.V. All rights reserved.
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