Reduced-dimensional perovskite photovoltaics with homogeneous energy landscape

Tingwei He, Saisai Li, Yuanzhi Jiang, Chaochao Qin, Minghuan Cui, Lu Qiao, Hongyu Xu, Jien Yang, Run Long, Huanhua Wang and Mingjian Yuan ()
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Tingwei He: Nankai University
Saisai Li: Nankai University
Yuanzhi Jiang: Nankai University
Chaochao Qin: Henan Normal University
Minghuan Cui: Henan Normal University
Lu Qiao: Beijing Normal University
Hongyu Xu: Nankai University
Jien Yang: Henan Normal University
Run Long: Beijing Normal University
Huanhua Wang: Chinese Academy of Science
Mingjian Yuan: Nankai University

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract Reduced-dimensional (quasi-2D) perovskite materials are widely applied for perovskite photovoltaics due to their remarkable environmental stability. However, their device performance still lags far behind traditional three dimensional perovskites, particularly high open circuit voltage (Voc) loss. Here, inhomogeneous energy landscape is pointed out to be the sole reason, which introduces extra energy loss, creates band tail states and inhibits minority carrier transport. We thus propose to form homogeneous energy landscape to overcome the problem. A synergistic approach is conceived, by taking advantage of material structure and crystallization kinetic engineering. Accordingly, with the help of density functional theory guided material design, (aminomethyl) piperidinium quasi-2D perovskites are selected. The lowest energy distribution and homogeneous energy landscape are achieved through carefully regulating their crystallization kinetics. We conclude that homogeneous energy landscape significantly reduces the Shockley-Read-Hall recombination and suppresses the quasi-Fermi level splitting, which is crucial to achieve high Voc.

Date: 2020
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DOI: 10.1038/s41467-020-15451-1

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