Material insights and challenges for non-fullerene organic solar cells based on small molecular acceptors

Jianquan Zhang, Huei Shuan Tan, Xugang Guo (), Antonio Facchetti () and He Yan ()
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Jianquan Zhang: Clear Water Bay
Huei Shuan Tan: EFlexPV Limited, Jinxiu Science Park
Xugang Guo: South University of Science and Technology of China
Antonio Facchetti: Northwestern University
He Yan: Clear Water Bay

Nature Energy, 2018, vol. 3, issue 9, 720-731

Abstract: Abstract The field of non-fullerene organic solar cells has experienced rapid development during the past few years, mainly driven by the development of novel non-fullerene acceptors and matching donor semiconductors. However, organic solar cell material development has progressed via a trial-and-error approach with limited understanding of the materials’ structure–property relationships and the underlying device physics of non-fullerene devices. In addition, the availability of hundreds of donor and acceptor semiconductors creates an extremely large pool of possible donor–acceptor combinations, which poses a daunting challenge for rational material screening and matching. This Review describes several important conceptual aspects of the emerging non-fullerene devices by highlighting key contributions that provided fundamental insights regarding rational material design, donor–acceptor pair matching, blend morphology control and the reduced voltage losses in non-fullerene organic solar cells. We also discuss the key challenges that need to be addressed to develop more-efficient non-fullerene organic solar cells.

Date: 2018
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DOI: 10.1038/s41560-018-0181-5

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