摘要
Low-dimensional organometal halide perovskites have attracted more and more attention because of their good optoelectronic properties and improved stability compared to three-dimensional analogues. In this work, we investigated the charge separation mechanism in multiple quantum well (MQW) perovskite films, which are composed of a mixture of layered perovskites (or quantum wells) with different bandgaps. Despite inefficient dissociation of photo-generated excitons in large-bandgap quantum wells due to the large exciton binding energy, efficient charge separation can occur at the MQW perovskite/electron-extracted-layer interface via energy and/or charge transfer from large-bandgap quantum wells to small-bandgap quantum wells. The MQW perovskite solar cell exhibits a 25-fold improvement in device efficiency, as compared to a pure 2D analogue.
源语言 | 英语 |
---|---|
文章编号 | 041103 |
期刊 | Applied Physics Letters |
卷 | 113 |
期 | 4 |
DOI | |
出版状态 | 已出版 - 23 7月 2018 |