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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 16: Perovskite and Photovoltaics II (joint session HL/KFM)
KFM 16.9: Vortrag
Donnerstag, 20. März 2025, 11:45–12:00, H13
The influence of oxygen and water on MAPbI3 absorber materials measured with in-situ TRPL and PES — •P. Stötzner1, M. Müller1, T. Schulz1, P. Pistor2, R. Scheer1, and S. Förster1 — 1Martin-Luther-Universität Halle-Wittenberg, Germany — 2Universidad Pablo de Olavide Sevilla, Spain
Methylammonium lead halide perovskites (MAPbI3) are promising thin-film solar cell absorber materials, but their response to environmental conditions like moisture and oxygen is not well understood. Here, we present a combined photoelectron spectroscopy (PES) and in-situ time-resolved photoluminescence (TRPL) study conducted in one ultrahigh vacuum system, which allows for studying changes in the chemical composition, the electronic structure and charge carrier lifetime. The setup is completed by a high-pressure gas cell enabling for controlled exposure to specific environments.
For MAPbI3, we observe a significant reduction of the charge carrier lifetime compared to ex-situ TRPL measurements. To bridge between the different measurement environments, we conducted additional TRPL measurements in a closed cell having the as-grown sample in nitrogen atmosphere, which is pumped to high vacuum. These results show a decreased lifetime in vacuum but an increased lifetime linked to air contact. Consequently, we exposed MAPbI3 samples to water vapor to mimic air contact, resulting in increased lifetime but also in a decomposition of MAPbI3. Pure oxygen exposure did not affect the lifetime. Surprisingly, the simultaneous exposure to both gases did not show the detrimental effect of water.
Keywords: lead halide perovskites; TRPL; UPS; XPS