Perovskite solar cells with embedded homojunction via nonuniform metal ion doping

Yuze Lin, Tao Li, Ye Liu, Behzad Bahrami, Dengyang Guo, Yanjun Fang, Yuchuan Shao, Qi Wang, Tom J. Savenije, More Authors

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

A long photoluminescence decay lifetime has been regarded as a generic indication of long charge carrier recombination lifetime in semiconductors such as metal halide perovskites (MHPs), which have shown tremendous success in solar cells. Here, we report that MHP polycrystalline films with extrinsic metal ions have a very long charge recombination lifetime, but a much shorter photoluminescence decay lifetime, and this huge difference can be explained by a model of lateral homojunction within each individual grain. The lateral homojunction is formed due to the doping along grain boundaries by metal ions, and then verified by nanoscale potential mapping and transient photo-response mapping. The built-in electric field within each grain reduces the recombination of free charge carriers within the perovskite grain and along grain boundaries, while the free electrons and holes are collected to cathode and anode through the grain boundaries and grain interiors, respectively. Then, the efficiencies of MHP polycrystalline solar cells are increased.

Original languageEnglish
Article number100415
JournalCell Reports Physical Science
Volume2
Issue number5
DOIs
Publication statusPublished - 2021

Keywords

  • charge carrier recombination
  • grain boundary doping
  • lateral homojunction
  • metal ion
  • nonuniform doping
  • perovskite solar cell

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