Why lead methylammonium tri-iodide perovskite-based solar cells require a mesoporous electron transporting scaffold (but not necessarily a hole conductor)

Eran Edri, Saar Kirmayer, Alex Henning, Sabyasachi Mukhopadhyay, Konstantin Gartsman, Yossi Rosenwaks, Gary Hodes, David Cahen

Research output: Contribution to journalArticlepeer-review

506 Scopus citations

Abstract

CH3NH3PbI3-based solar cells were characterized with electron beam-induced current (EBIC) and compared to CH 3NH3PbI3-xClx ones. A spatial map of charge separation efficiency in working cells shows p-i-n structures for both thin film cells. Effective diffusion lengths, LD, (from EBIC profile) show that holes are extracted significantly more efficiently than electrons in CH3NH3PbI3, explaining why CH 3NH3PbI3-based cells require mesoporous electron conductors, while CH3NH3PbI3-xCl x ones, where LD values are comparable for both charge types, do not.

Original languageEnglish
Pages (from-to)1000-1004
Number of pages5
JournalNano Letters
Volume14
Issue number2
DOIs
StatePublished - 12 Feb 2014
Externally publishedYes

Keywords

  • Perovskite solar cell
  • electron beam induced current
  • organic-inorganic lead halide
  • photovoltaic
  • scanning kelvin probe force microscopy

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry (all)
  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanical Engineering

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