Chemo-thermal surface dedoping for high-performance tin perovskite solar cells

Jianheng Zhou, Mingwei Hao, Yu Zhang, Xue Ma, Jianchao Dong, Feifei Lu, Jie Wang, Ning Wang*, Yuanyuan Zhou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Removing the lead (Pb) from state-of-the-art perovskite solar cells (PSCs) while maintaining high power conversion efficiencies (PCEs) is a prominent step toward full commercialization. The field has identified tin (Sn) PSCs as a promising alternative, but the performance of these Sn PSCs are limited primarily by detrimental Sn(IV) self-doping. Herein, we demonstrate Sn PSCs with PCEs up to 14.7% via a surface-dedoping approach. This method features the chemo-thermal removal of Sn(IV) self-dopants that are found mainly accumulated on the surface of Sn perovskite thin films, and its optimization can avoid negative effects on film morphology. Using this method, we show about a 3-fold enhancement in carrier lifetime and a 2-fold reduction in trap density, underpinning the device's efficiency improvement. The Sn PSCs are also stable, with a 92% PCE retention after 1,000 h of storage in a nitrogen-filled glovebox. This work paves a way for PSCs to achieve their technological potential without Pb involvement.

Original languageEnglish
Pages (from-to)683-693
Number of pages11
JournalMatter
Volume5
Issue number2
DOIs
Publication statusPublished - 2 Feb 2022

Scopus Subject Areas

  • Materials Science(all)

User-Defined Keywords

  • chemo-thermal approach
  • dedoping
  • lead-free perovskite
  • stability
  • tin perovskite photovoltaic
  • MAP5: Improvement

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