articleApplied Physics LettersOct 20, 2014Closed access

Qualifying composition dependent p and n self-doping in CH3NH3PbI3

QWQi WangYSYuchuan ShaoHXHaipeng XieLLLu LyuXLXiaoliang Liu

University of Nebraska–Lincoln · Central South University · +1 more institution

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Abstract

We report the observation of self-doping in perovskite. CH3NH3PbI3 was found to be either n- or p-doped by changing the ratio of methylammonium halide (MAI) and lead iodine (PbI2) which are the two precursors for perovskite formation. MAI-rich and PbI2-rich perovskite films are p and n self-doped, respectively. Thermal annealing can convert the p-type perovskite to n-type by removing MAI. The carrier concentration varied as much as six orders of magnitude. A clear correlation between doping level and device performance was also observed.

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Topics & keywords

Topics
Keywords
  • Doping
  • Perovskite (structure)
  • Halide
  • Annealing (glass)
  • Materials science
  • Analytical Chemistry (journal)
  • Inorganic chemistry
  • Chemistry
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