Atomistic insight to perovskite materials and their interfaces using X-ray based Spectroscopy
Håkan Rensmo a
a Department of Physics and Astronomy; Molecular and Condensed Matter Physics, Uppsala University, Box 516, Uppsala, Sweden
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
London, United Kingdom, 2023 June 12th - 14th
Organizers: Tracey Clarke, James Durrant and Trystan Watson
Oral, Håkan Rensmo, presentation 275
Publication date: 30th March 2023

Understanding of the electronic structure of perovskite materials used in photovoltaic devices is essential for their development and optimization. The element selectivity of X-ray based spectroscopies such photoelectron spectroscopy and X-ray absorption spectroscopy are ideal for non-destructive chemical and electronic characterization of such materials and their interfaces. With the developments at synchrotron facilities and methodologies by us and others these tools are quickly developing for investigations on energy material systems and allow for investigation of the chemistry, energy matching and valence and conduction band character of material surface, bulk and interface. (1-3)

Here we will present our latest results on the use of high resolution XAS and energy dependent valence level photoelectron spectroscopy on lead halide perovskite interfaces. The investigation ranges from single crystals to polycrystalline films and focus on the contribution of the A-cation in the valence band and conduction band levels. Based on the findings on the pristine materials we also describe how to determine the energy matching in a perovskite/hole-conductor/metal interface in dark and under visible illumination.

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