Suppressed Ion Migration in Reduced-Dimensional Perovskites Improves Operating Stability

Ziru Huang, Andrew H. Proppe, Hairen Tan, Makhsud I. Saidaminov, Furui Tan, Anyi Mei, Chih Shan Tan, Mingyang Wei, Yi Hou, Hongwei Han, Shana O. Kelley, Edward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Impressive progress in halide perovskite solar cells motivates further work to improve operating stability. It is known that ion-migration-driven decomposition represents a degradation pathway in perovskite solar cells and that it can occur within the perovskite material even in well-encapsulated devices. Here we find that quasi-two-dimensional (2.5D) perovskites suppress this ion-migration-induced degradation. Using TOF-SIMS, we confirm that iodide migration occurs in bulk perovskite photovoltaic devices operating at their maximum power point (MPP). We observe that iodine ions migrate across the spiro-OMeTAD layer to the spiro/gold contact interface, oxidizing and deteriorating the gold at the interface. In contrast, we find that large n»2.5D perovskites exhibit a significantly reduced rate of ion migration compared to 3D devices and exhibit less than 1% relative PCE loss in over 80 h of continuous operation at MPP, whereas the PCE of 3D devices diminishes by more than 50% within the first 24 h.

Original languageEnglish (US)
Pages (from-to)1521-1527
Number of pages7
JournalACS Energy Letters
Volume4
Issue number7
DOIs
StatePublished - Jun 10 2019
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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