Improving Photostability of Cesium-Doped Formamidinium Lead Triiodide Perovskite

Donakowski, Anthony; Miller, D. Westley; Anderson, Nicholas C.; Ruth, Anthony; Sanehira, Erin M.; Berry, Joseph J.; Irwin, Michael D.; Rockett, Angus; Steirer, K. Xerxes

doi:10.1021/acsenergylett.0c02339

Improving Photostability of Cesium-Doped Formamidinium Lead Triiodide Perovskite

Journal Article · Wed Jan 20 00:00:00 EST 2021 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.0c02339· OSTI ID:1768286

Donakowski, Anthony ^[1]; Miller, D. Westley ^[2]; Anderson, Nicholas C. ^[2]; Ruth, Anthony ^[2]; Sanehira, Erin M. ^[2]; Berry, Joseph J. ^[3]; Irwin, Michael D. ^[2]; ^[4]; ^[1]

Physics Department, Colorado School of Mines, Golden, Colorado 80401, United States
Hunt Perovskite Technologies LLC, Dallas, Texas 75201, United States
National Renewable Energy Laboratory, Golden, Colorado 80401, United States
Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401, United States

Using time-resolved in situ X-ray photoelectron spectroscopy, we identify and suppress rapid degradation mechanisms for cesium-stabilized formamidinium lead iodide perovskite materials used in state-of-the-art photovoltaics. Accelerated degradation under high light intensity and heating reveals a photocatalytic reaction pathway responsible for rapid decomposition in iodide-rich compositions and a slower pathway for more stoichiometric samples. Using Avrami–Erofe’ev kinetic analysis, we find that the fast process is consistent with a 2D crystallization and growth mechanism fueled by excess halide salt at grain boundaries and surfaces. Moreover, the rate of decomposition varies dramatically with the wavelength of light used to illuminate the thin films. Furthermore, our results reveal the photodegradation mechanisms of PbI₂ and excess iodide and provide a path to increasing perovskite stability under photoexcitation.

View Accepted Manuscript (DOE)

Research Organization:: Colorado School of Mines, Golden, CO (United States); National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: AC36-08GO28308; EE0008540

OSTI ID:: 1768286

Alternate ID(s):: OSTI ID: 1783263

Report Number(s):: NREL/JA--5K00-78708; MainId:32625; UUID:5f4f6de8-d89d-46cf-81ba-ac3f16b6d56d; MainAdminID:19693

Journal Information:: ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 2 Vol. 6; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Improving Photostability of Cesium-Doped Formamidinium Lead Triiodide Perovskite

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