Planar p–n homojunction perovskite solar cells with efficiency exceeding 21.3%

Peng Cui, Dong Wei, Jun Ji, Hao Huang, Endong Jia, Shangyi Dou, Tianyue Wang, Wenjing Wang and Meicheng Li ()
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Peng Cui: North China Electric Power University
Dong Wei: North China Electric Power University
Jun Ji: North China Electric Power University
Hao Huang: North China Electric Power University
Endong Jia: Chinese Academy of Sciences
Shangyi Dou: North China Electric Power University
Tianyue Wang: North China Electric Power University
Wenjing Wang: Chinese Academy of Sciences
Meicheng Li: North China Electric Power University

Nature Energy, 2019, vol. 4, issue 2, 150-159

Abstract: Abstract Perovskite solar cells (PSCs) have emerged as an attractive photovoltaic technology thanks to their outstanding power conversion efficiency (PCE). Further improvement in the device efficiency is limited by the recombination of the charge carriers in the perovskite layer even when employing heterojunction-based architectures. Here, we propose and demonstrate a p-type perovskite/n-type perovskite homojunction whose built-in electric field promotes oriented transport of the photo-induced carriers, thus reducing carrier recombination losses. By controlling the stoichiometry of the perovskite precursors, we are able to induce n-type or p-type doping. We integrate the homojunction structure in a planar PSC combining a thermally evaporated p-type perovskite layer on a solution-processed n-type perovskite layer. The PSC with a MAPbI3 homojunction achieves a PCE of 20.80% (20.5% certified PCE), whereas the PSC based on a FA0.15MA0.85PbI3 homojunction delivers a PCE of 21.38%. We demonstrate that the homojunction structure is an effective approach, beyond existing planar heterojunction PSCs, to achieve highly efficient PSCs with reduced carrier recombination losses.

Date: 2019
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DOI: 10.1038/s41560-018-0324-8

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