A-Site Cation Dependence of Self-Healing in Polycrystalline APbI3 Perovskite Films

Pallavi Singh, Yahel Soffer, Davide Raffaele Ceratti, Michael Elbaum, Dan Oron, Gary Hodes, David Cahen

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


In terms of sustainable use, halide perovskite (HaP) semiconductors have a strong advantage over most other classes of materials for (opto)electronics, as they can self-heal (SH) from photodamage. While there is considerable literature on SH in devices, where it may not be clear exactly where damage and SH occur, there is much less on the HaP material itself. Here we perform “fluorescence recovery after photobleaching” (FRAP) measurements to study SH on polycrystalline thin films for which encapsulation is critical to achieving complete and fast self-healing. We compare SH in three photoactive APbI3 perovskite films by varying the A-site cation ranging from (relatively) small inorganic Cs through medium-sized MA to large FA (the last two are organic cations). While the A cation is often considered electronically relatively inactive, it significantly affects both SH kinetics and the threshold for photodamage. The SH kinetics are markedly faster for γ-CsPbI3 and α-FAPbI3 than for MAPbI3. Furthermore, γ-CsPbI3 exhibits an intricate interplay between photoinduced darkening and brightening. We suggest possible explanations for the observed differences in SH behavior. This study’s results are essential for identifying absorber materials that can regain intrinsic, insolation-induced photodamage-linked efficiency loss during its rest cycles, thus enabling applications such as autonomously sustainable electronics.

Original languageEnglish
Pages (from-to)2447-2455
Number of pages9
JournalACS Energy Letters
Issue number5
StatePublished - 12 May 2023
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society.


D.O. and D.C. gratefully acknowledge financial support from the Weizmann Sustainability and Energy Research Initiative. Y.S. is supported by the Ariane de Rothschild Women Doctoral Program. We thank Sidney R. Cohen for the AFM measurements and their analyses and Yoseph Addadi for several one-photon confocal microscopy experiments. We also thank Yevgeny Rakita (Ben Gurion University) and S. Kumar, S. Saxena, and Igor Lubomirsky (from the WIS) for valuable discussions. For D.R.C., this project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No. 893194. In part, the research was made possible by the Harold Perlman family’s historic generosity. M.E. holds the Sam and Ayala Zacks Professorial Chair. D.O. is the incumbent of the Harry Weinrebe Professorial Chair of laser physics.

FundersFunder number
Ariane de Rothschild Women Doctoral Program
Harold Perlman family’s historic generosity
Horizon 2020 Framework Programme
H2020 Marie Skłodowska-Curie Actions893194
Ben-Gurion University of the Negev


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