In mixed halide lead perovskites, halogen vacancy defects form deep electronic levels specifically when chlorine is present, and several transition-metal substitutions at the lead site create low-energy mid-gap states.
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Defect Physics of Pseudo-cubic Mixed Halide Lead Perovskites from First Principles
In mixed halide lead perovskites, halogen vacancy defects form deep electronic levels specifically when chlorine is present, and several transition-metal substitutions at the lead site create low-energy mid-gap states.