Large grained and high charge carrier lifetime CH3NH3PbI3 thin-films: implications for perovskite solar cells

Arun Singh Chouhan, Naga Prathibha Jasti, Shreyash Hadke, Srinivasan Raghavan, Sushobhan Avasthi

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Spin coated perovskite thin films are known to have an issue of pinholes & poor morphology control which lead to poor device-to-device repeatability, that is an impediment to scale-up. In this work, Methylamine vapor annealing process is demonstrated which consistently leads to high-quality perovskite thin-films with an average grain-size of 10–15 μm. The improvement in film morphology enables improvement in effective carrier recombination lifetime, from 21 μs in as-deposited films to 54 μs in vapor-annealed films. The annealed films with large-grains are also more stable in ambient conditions. Devices made on annealed perovskite films are very consistent, with a standard deviation of only 0.7%. Methylamine vapor annealing process is a promising method of depositing large-grain CH3NH3PbI3 films with high recombination lifetime and the devices with improved performance.

Original languageEnglish
Pages (from-to)1335-1340
Number of pages6
JournalCurrent Applied Physics
Volume17
Issue number10
DOIs
StatePublished - Oct 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

  • Large grains
  • Methylamine vapor annealing
  • Microwave detected carrier lifetime
  • Morphology
  • Perovskite
  • Solar cell

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