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 language | English |
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Pages (from-to) | 3013-3016 |
Number of pages | 4 |
Journal | ACS Applied Energy Materials |
Volume | 2 |
Issue number | 5 |
DOIs | |
State | Published - 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.
Funders | Funder number |
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European Union Seventh Framework Program | |
FP7/2007 | 316494 |
Keywords
- CsPbBr perovskites
- light-soaking effect
- photoluminescence
- solar cells
- thin films