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Review
. 2019 Sep 5;9(9):1269.
doi: 10.3390/nano9091269.

The Way to Pursue Truly High-Performance Perovskite Solar Cells

Jia-Ren Wu  1 , Diksha Thakur  2 , Shou-En Chiang  3 , Anjali Chandel  4 , Jyh-Shyang Wang  5   6 , Kuan-Cheng Chiu  7   8 , Sheng Hsiung Chang  9   10
Affiliations
Review

The Way to Pursue Truly High-Performance Perovskite Solar Cells

Jia-Ren Wu et al. Nanomaterials (Basel). .

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.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Photo-excited carrier dynamics in an energy–space diagram.
Figure 2
Figure 2
Hot carrier-optical phonon energy transfer and thermalization process.
Figure 3
Figure 3
Hot-electron injection from dyes to the quantized energy levels of TiO2 quantum dots (QDs).
Figure 4
Figure 4
Energy diagram of hot-hole and hot-electron relaxations.
Figure 5
Figure 5
Energy diagrams. (a) Single-junction hot-carrier solar cell. (b) Tandem solar cell.
See this image and copyright information in PMC

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