Pin-Hole-Free, Homogeneous, Pure CsPbBr3 Films on Flat Substrates by Simple Spin-Coating Modification

Satyajit Gupta, Michael Kulbak, David Cahen

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We show a simple modification of spin-coating to obtain pinhole-free, well-covering and uniform films of an all-inorganic Pb-halide perovskite (Pb-HaP), on a flat substrate (i.e., not mesoporous) at standard temperature and pressure. In Pb-HaP-based devices the active film is generally fabricated by spin-coating. This is a challenging task for purely inorganic Pb-HaPs, as, except if nano-crystallites can be used, mostly rough and inhomogeneous thin films with poor optoelectronic quality are obtained. We describe a gas flow-assisted method to fabricate thin conformal films of phase-pure CsPbBr3. First cells made with the resulting CsPbBr3-films, yield solar conversion efficiencies up to 2.5%. Electron beam-induced current measurements of device cross-sections show uniform charge generation profiles, implying ≥ ~ 0.2 μm diffusion lengths. Non-encapsulated devices generate stable photocurrent for > 1 hr under continuous illumination at maximum power in ambient.

Original languageEnglish
Article number100
JournalFrontiers in Energy Research
Volume8
DOIs
StatePublished - 9 Jun 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© Copyright © 2020 Gupta, Kulbak and Cahen.

Keywords

  • electron beam-induced current
  • halide perovskite
  • solar cell
  • stability
  • thin films

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