Efficient charge separation at multiple quantum well perovskite/PCBM interface

Yingqiang Wei; Meijin Li; Renzhi Li; Li Zhang; Rong Yang; Wei Zou; Yu Cao; Mengmeng Xu; Chang Yi; Nana Wang; Jianpu Wang; Wei Huang

doi:10.1063/1.5045277

Efficient charge separation at multiple quantum well perovskite/PCBM interface

Yingqiang Wei, Meijin Li, Renzhi Li, Li Zhang, Rong Yang, Wei Zou, Yu Cao, Mengmeng Xu, Chang Yi, Nana Wang, Jianpu Wang, Wei Huang

Institute of Flexible Electronics

Nanjing Tech University

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

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.

Original language	English
Article number	041103
Journal	Applied Physics Letters
Volume	113
Issue number	4
DOIs	https://doi.org/10.1063/1.5045277
State	Published - 23 Jul 2018

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abstract = "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.",

author = "Yingqiang Wei and Meijin Li and Renzhi Li and Li Zhang and Rong Yang and Wei Zou and Yu Cao and Mengmeng Xu and Chang Yi and Nana Wang and Jianpu Wang and Wei Huang",

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AU - Wei, Yingqiang

AU - Li, Meijin

AU - Li, Renzhi

AU - Zhang, Li

AU - Yang, Rong

AU - Zou, Wei

AU - Cao, Yu

AU - Xu, Mengmeng

AU - Yi, Chang

AU - Wang, Nana

AU - Wang, Jianpu

AU - Huang, Wei

PY - 2018/7/23

Y1 - 2018/7/23

N2 - 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.

AB - 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.

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Efficient charge separation at multiple quantum well perovskite/PCBM interface

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