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We have studied the electronic structure of CH ₃ NH ₃ PbI ₃ (MAPI) and CH ₃ NH ₃ SnI ₃ (MASI) perovskite films by performing X-ray photoelectron spectroscopy (XPS) measurements on in situ grown perovskite films.
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Hellmann et al. (2019) studied this question.
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