Regensburg 2025 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 2: Perovskite and Photovoltaics I (joint session HL/KFM)
KFM 2.1: Vortrag
Montag, 17. März 2025, 09:30–09:45, H13
Oxygen-Mediated (0D) Cs4PbX6 Formation during Open-Air Thermal Processing Improves Inorganic Perovskite Solar Cell Performance — Rafikul Ali Saha1, •Wei-Hsun Chiu2, Giedrius Degutis1, Peng Chen3, Matthias Filez4, Eduardo Solano5, Nikolai Orlov6, Francesco De Angelis7, Carlo Meneghini7, Christophe Detavernier4, Sawanta S. Mali8, Minh Tam Hoang2, Yang Yang2, Erik C. Garnett9, Lianzhou Wang3, Hongxia Wang2, Maarten B. J. Roeffaers1, and Julian A. Steele3 — 1KU Leuven, Belgium — 2Queensland University of Technology, Brisbane, Australia — 3The University of Queensland, Brisbane, Australia — 4Ghent University, Belgium — 5ALBA synchrotron, Barcelona, Spain — 6AMOLF, Amsterdam, The Netherlands — 7Roma Tre University, Rome, Italy — 8Chonnam National University, Gwangju, South Korea — 9University of Amsterdam, The Netherlands
We highlight the beneficial role of ambient oxygen during the open-air thermal processing of metastable γ-CsPbI3-based perovskite thin films and devices. Physiochemical-sensitive probes elucidate oxygen intercalation and the formation of Pb-O bonds in the perovskite, entering via iodine vacancies at the surface, creating superoxide (O2-) through electron transfer reactions, which drives the formation of a zero-dimensional (0D) Cs4PbI6 protective capping layer during annealing (>330°C). Applied to γ-CsPbI2Br perovskite solar cells, it boosts the operational stability and photo-conversion efficiency of champion devices from 12.7% to 15.4% when annealed in dry air.
Keywords: inorganic metal halide perovskite; phase stability; ambient oxygen; CsPb(I,Br)3; solar cells