Counter-Doping Effect by Trivalent Cations in Tin-Based Perovskite Solar Cells

Tianyue Wang, Hok-Leung Loi, Qi Cao, Guitao Feng, Zhiqiang Guan, Qi Wei, Changsheng Chen, Mingjie Li, Ye Zhu, Chun-Sing Lee, Feng Yan*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

10 Citations (Scopus)
23 Downloads (CityUHK Scholars)

Abstract

Tin (Sn) -based perovskite solar cells (PSCs) normally show low open circuit voltage due to serious carrier recombination in the devices, which can be attributed to the oxidation and the resultant high p-type doping of the perovskite active layers. Considering the grand challenge to completely prohibit the oxidation of Sn-based perovskites, a feasible way to improve the device performance is to counter-dope the oxidized Sn-based perovskites by replacing Sn2+ with trivalent cations in the crystal lattice, which however is rarely reported. Here, the introduction of Sb3+, which can effectively counter-dope the oxidized perovskite layer and improve the carrier lifetime, is presented. Meanwhile, Sb3+ can passivate deep-level defects and improve carrier mobility of the perovskite layer, which are all favorable for the photovoltaic performance of the devices. Consequently, the target devices yield a relative enhancement of the power conversion efficiency (PCE) of 31.4% as well as excellent shelf-storage stability. This work provides a novel strategy to improve the performance of Sn-based PSCs, which can be developed as a universal way to compensate for the oxidation of Sn-based perovskites in optoelectronic devices. © 2024 The Author(s). Advanced Materials published by Wiley-VCH GmbH.
Original languageEnglish
Article number2402947
JournalAdvanced Materials
Volume36
Issue number30
Online published21 May 2024
DOIs
Publication statusPublished - 25 Jul 2024

Funding

T.Y.W. and H.L.L. contributed equally to this work. This work is supported by the Research Grants Council of Hong Kong, China (Project No. 15306822 and C1009-17EF), and the Hong Kong Polytechnic University, Hong Kong, China (ZE2X). This work is also supported by Shenzhen Science and Technology Innovation Commission (Project No. SGDX20210823103401011).

Research Keywords

  • counter-doping
  • efficiency
  • Sn-based perovskite solar cell
  • trivalent antimony

Publisher's Copyright Statement

  • This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

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