Chloride inclusion and hole transport material doping to improve methyl ammonium lead bromide perovskite-based high open-circuit voltage solar cells

Eran Edri, Saar Kirmayer, Michael Kulbak, Gary Hodes, David Cahen

Research output: Contribution to journalArticlepeer-review

356 Scopus citations

Abstract

Low-cost solar cells with high VOC, relatively small (E G - qVOC), and high qVOC/EG ratio, where EG is the absorber band gap, are long sought after, especially for use in tandem cells or other systems with spectral splitting. We report a significant improvement in CH3NH3PbBr3-based cells, using CH3NH3PbBr3-xClx, with EG = 2.3 eV, as the absorber in a mesoporous p-i-n device configuration. By p-doping an organic hole transport material with a deep HOMO level and wide band gap to reduce recombination, the cell's VOC increased to 1.5 V, a 0.2 V increase from our earlier results with the pristine Br analogue with an identical band gap. At the same time, in the most efficient devices, the current density increased from ∼1 to ∼4 mA/cm2.

Original languageEnglish
Pages (from-to)429-433
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume5
Issue number3
DOIs
StatePublished - 6 Feb 2014
Externally publishedYes

Keywords

  • high open-circuit voltage
  • organic-inorganic lead halide perovskite
  • solar cell

ASJC Scopus subject areas

  • General Materials Science
  • Physical and Theoretical Chemistry

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