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Nanomaterials (Basel). 2019 Sep 5;9(9). pii: E1269. doi: 10.3390/nano9091269.

The Way to Pursue Truly High-Performance Perovskite Solar Cells.

Author information

1
Department of Physics, Chung Yuan Christian University, Taoyuan32023, Taiwan. jrwu@cycu.org.tw.
2
Department of Physics, Chung Yuan Christian University, Taoyuan32023, Taiwan. dikshathakur200596@gmail.com.
3
Department of Physics, Chung Yuan Christian University, Taoyuan32023, Taiwan. 10762004@cycu.org.tw.
4
Department of Physics, Chung Yuan Christian University, Taoyuan32023, Taiwan. anjalichandel62@gmail.com.
5
Department of Physics, Chung Yuan Christian University, Taoyuan32023, Taiwan. jswang@cycu.edu.tw.
6
Center for Nano Technology, Chung Yuan Christian University, Taoyuan 32023, Taiwan. jswang@cycu.edu.tw.
7
Department of Physics, Chung Yuan Christian University, Taoyuan32023, Taiwan. kcchiu@cycu.edu.tw.
8
Center for Nano Technology, Chung Yuan Christian University, Taoyuan 32023, Taiwan. kcchiu@cycu.edu.tw.
9
Department of Physics, Chung Yuan Christian University, Taoyuan32023, Taiwan. shchang@cycu.edu.tw.
10
Center for Nano Technology, Chung Yuan Christian University, Taoyuan 32023, Taiwan. shchang@cycu.edu.tw.

Abstract

The power conversion efficiency (PCE) of single-junction solar cells was theoretically predicted to be limited by the Shockley-Queisser limit due to the intrinsic potential loss of the photo-excited electrons in the light absorbing materials. Up to now, the optimized GaAs solar cell has the highest PCE of 29.1%, which is close to the theoretical limit of ~33%. To pursue the perfect photovoltaic performance, it is necessary to extend the lifetimes of the photo-excited carriers (hot electrons and hot holes) and to collect the hot carriers without potential loss. Thanks to the long-lived hot carriers in perovskite crystal materials, it is possible to completely convert the photon energy to electrical power when the hot electrons and hot holes can freely transport in the quantized energy levels of the electron transport layer and hole transport layer, respectively. In order to achieve the ideal PCE, the interactions between photo-excited carriers and phonons in perovskite solar cells has to be completely understood.

KEYWORDS:

hot-carrier characteristics; perovskite solar cells; quantized electron transport layer; quantized hole transport layer

PMID:
31492035
DOI:
10.3390/nano9091269
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