Radiative Recombination Changes under Light-Soaking in CsPbBr3 Films on TiO2 and Insulating Glass Contacts: Interface versus Bulk Effects

Jiangang Hu, Laxman Gouda, Adi Kama, Shay Tirosh, Ronen Gottesman

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The steady-state photoluminescence (PL) of CsPbBr3 films with varying thicknesses was studied under light-soaking on semiconductive and insulating contacts, showing reversible changes in PL, entirely dependent on the nature of the contact and film thicknesses. The PL at 50-100 nm CsPbBr3 on TiO2 increased, and decreased in thicker layers, with no thickness-dependent PL in CsPbBr3 on glass/Al2O3. These observations are described using a spatial charge distribution model which interprets the migration of Br- and VBr+ under light-soaking as suppressing electron injection into the TiO2 due to upward band bending, enhancing PL at the interface and nonradiative recombination further away from it.

Original languageEnglish
Pages (from-to)3013-3016
Number of pages4
JournalACS Applied Energy Materials
Volume2
Issue number5
DOIs
StatePublished - 28 May 2019

Bibliographical note

Publisher Copyright:
© 2019 American Chemical Society.

Funding

*E-mail: [email protected]. ORCID Laxman Gouda: 0000-0001-9022-0151 Ronen Gottesman: 0000-0001-5223-478X Present Address †R.G: Helmholtz-Zentrum Berlin für Materialien and Energie GmbH, Institute for Solar Fuels, Hahn-Meitner-Platz 1, 14109 Berlin, Germany. Funding J.H. and L.G. received funding from the European Union Seventh Framework Program [FP7/2007-2013] under grant agreement 316494. Notes The authors declare no competing financial interest.

FundersFunder number
European Union Seventh Framework Program
FP7/2007316494

    Keywords

    • CsPbBr perovskites
    • light-soaking effect
    • photoluminescence
    • solar cells
    • thin films

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