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Keywords:

  • electronic structure;
  • quantum dots;
  • photoelectron spectroscopy;
  • photovoltaics;
  • trap states
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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 to a marked improvement in the device performance.