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 |
Appears in Collections: | Articles |