Journal
ADVANCED MATERIALS
Volume 32, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201906324
Keywords
charge generation; nonfullerene acceptors; organic solar cells; power conversion efficiency; solar cell morphology
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Funding
- National Key R&D Program of China [2017YFA0204701]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB12010200]
- National Basic Research Program of China (Program 973) [2014CB643502]
- National Natural Science Foundation of China [21572234, 21661132006, 91833304, 21805289]
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Manipulating charge generation in a broad spectral region has proved to be crucial for nonfullerene-electron-acceptor-based organic solar cells (OSCs). 16.64% high efficiency binary OSCs are achieved through the use of a novel electron acceptor AQx-2 with quinoxaline-containing fused core and PBDB-TF as donor. The significant increase in photovoltaic performance of AQx-2 based devices is obtained merely by a subtle tailoring in molecular structure of its analogue AQx-1. Combining the detailed morphology and transient absorption spectroscopy analyses, a good structure-morphology-property relationship is established. The stronger pi-pi interaction results in efficient electron hopping and balanced electron and hole mobilities attributed to good charge transport. Moreover, the reduced phase separation morphology of AQx-2-based bulk heterojunction blend boosts hole transfer and suppresses geminate recombination. Such success in molecule design and precise morphology optimization may lead to next-generation high-performance OSCs.
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