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Reduced Nonradiative Energy Loss Caused by Aggregation of Nonfullerene Acceptor in Organic Solar Cells
Author(s) -
Qin Yunpeng,
Zhang Shaoqing,
Xu Ye,
Ye Long,
Wu Yi,
Kong Jingyi,
Xu Bowei,
Yao Huifeng,
Ade Harald,
Hou Jianhui
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201901823
Subject(s) - organic solar cell , acceptor , materials science , ternary operation , photovoltaic system , energy conversion efficiency , open circuit voltage , polymer solar cell , optoelectronics , voltage , computer science , physics , electrical engineering , polymer , composite material , engineering , quantum mechanics , programming language , condensed matter physics
Reducing energy loss ( E loss ) is of critical importance to improving the photovoltaic performance of organic solar cells (OSCs). Although nonradiative recombination ( E loss nonrad) is investigated in quite a few works, the method for modulatingE loss nonradis seldom reported. Here, a new method of depressing E loss is reported for nonfullerene OSCs. In addition to ternary‐blend bulk heterojunction (BHJ) solar cells, it is proved that a small molecular material (NRM‐1) can be selectively dispersed into the acceptor phase in the PBDB‐T:IT‐4F‐based OSC, resulting in lowerE loss radandE loss nonrad, and hence a significant improvement in the open‐circuit voltage ( V OC ); under an optimal feed ratio of NRM‐1, an enhanced power conversion efficiency can also be gained. Moreover, the role of NRM‐1 in the method is illustrated and its applicability for several other representative OSCs is validated. This work paves a new pathway to reduce the E loss for nonfullerene OSCs.