Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 5: Perovskite and Photovoltaics 1 (joint session HL/CPP/KFM)
HL 5.4: Vortrag
Montag, 5. September 2022, 10:15–10:30, H34
Application of atomic layer deposition and x-ray photoelectron spectroscopy in perovskite solar cells — •Małgorzata Kot1, Chittaranjan Das2, Lukas Kegelmann3, Hans Koebler3, Mikhailo Vorokhta4, Carlos Escudero5, Steve Albrecht3, Antonio Abate3, and Jan Ingo Flege1 — 1BTU Cottbus-Senfteberg, Cottbus, Germany — 2KIT, Eggenstein-Leopoldshafen, Germany — 3HZB, Berlin, Germany — 4Charles University, Prague, Czech Republic — 5ALBA Synchrotron, Cerdanyola del Vallès, Spain
In this work we have utilized near-ambient pressure and ultra-high vacuum X-ray photoelectron spectroscopy as well as atomic layer deposition to investigate perovskite solar cells (PSCs). We have demonstrated that ultrathin room temperature atomic layer-deposited aluminium oxide on the perovskite surface very effectively suppresses iodine migration[1] and improves the long term stability and efficiency of PSCs [2,3]. Furthermore, exposure to light proves more detrimental to the perovskite film than exposure to water vapor.[2] Absorbed photons create Frenkel defects in the perovskite crystal and their number strongly depends on the used illumination. The higher the photon flux, the higher the concentration of Frenkel defects, and thus the stronger the degradation of power conversion efficiency and the stronger the hysteresis in the J-V characteristics. [1] C. Das, M. Kot et al., Cell Reports Physical Science 2020, 1, 100112. [2] M. Kot et al., ChemSusChem 2020, 13, 5722. [3] M. Kot et al., ChemSusChem 2018, 11, 3640.