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Surface defects, acting as traps for charge carriers, are a key factor limiting the performance of colloidal quantum dot (CQD) photovoltaics. Revealing the full electronic band structure of PbS CQD devices, subjected to the latest surface passivation treatments, enables a direct correlation of features in the band structure with device performance characteristics, as described by Osman M. Bakr and...
The direct observation of the complete electronic band structure of a family of PbS CQD solids via photoelectron spectroscopy is reported. We investigate how materials processing strategies, such as the latest passivation methods that produce record‐performance photovoltaics, achieve their performance advances. Halide passivated films show a drastic reduction in states in the midgap, contributing...
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