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.
|Number of pages||4|
|Journal||ACS Applied Energy Materials|
|State||Published - 28 May 2019|
Bibliographical noteFunding Information:
*E-mail: firstname.lastname@example.org. 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.
© 2019 American Chemical Society.
- CsPbBr perovskites
- light-soaking effect
- solar cells
- thin films