標題: Enabling High-Performance Tandem Organic Photovoltaic Cells by Balancing the Front and Rear Subcells
作者: Cheng, Pei
Wang, Hao-Cheng
Zheng, Ran
Zhu, Yuan
Dai, Shuixing
Li, Zeyuan
Chen, Chung-Hao
Zhao, Yepin
Wang, Rui
Meng, Dong
Zhu, Chenhui
Wei, Kung-Hwa
Zhan, Xiaowei
Yang, Yang
交大名義發表
National Chiao Tung University
關鍵字: charge transport;exciton generation;nonfullerene;organic solar cells;tandem
公開日期: 1-Jan-1970
摘要: In tandem organic photovoltaics, the front subcell is based on large-bandgap materials, whereas the case of the rear subcell is more complicated. The rear subcell is generally composed of a narrow-bandgap acceptor for infrared absorption but a large-bandgap donor to realize a high open-circuit voltage. Unfortunately, most of the ultraviolet-visible part of the photons are absorbed by the front subcell; as a result, in the rear subcell, the number of excitons generated on large-bandgap donors will be reduced significantly. This reduces the (photo) conductivity and finally limits the hole-transporting property of the rear subcell. In this work, a simple and effective way is proposed to resolve this critical issue. To ensure sufficient photogenerated holes in the rear subcell, a small amount of an infrared-absorbing polymer donor as a third component is introduced, which provides a second hole-generation and transporting mechanism to minimize the aforementioned detrimental effects. Finally, the short-circuit current density of the two-terminal tandem organic photovoltaic is significantly enhanced from 10.3 to 11.7 mA cm(-2)(while retaining the open-circuit voltage and fill factor) to result in an enhanced power conversion efficiency of 15.1%.
URI: http://dx.doi.org/10.1002/adma.202002315
http://hdl.handle.net/11536/155379
ISSN: 0935-9648
DOI: 10.1002/adma.202002315
期刊: ADVANCED MATERIALS
起始頁: 0
結束頁: 0
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