Photovoltage Behavior in Perovskite Solar Cells under Light-Soaking Showing Photoinduced Interfacial Changes

Jiangang Hu, Ronen Gottesman, Laxman Gouda, Adi Kama, Maayan Priel, Shay Tirosh, Juan Bisquert, Arie Zaban

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85 Scopus citations


The photovoltage of perovskite solar cells (PSCs) was studied over a wide range of light intensities, showing changes from pristine to light-soaking (LS) conditions, explained using a specific model of spatial charge distribution. Migration of ions and vacancies under photovoltage conditions results in localized charge redistribution manifested as positive charge accumulation at the TiO2 or TiO2-MgO interlayer-perovskite interface, signifying photoinduced interfacial upward band bending. Consequentially, generation of an electrostatic potential (Velec) and an increase in interfacial recombination rate are confirmed. The magnitude and effect of Velec and interfacial recombination on the photovoltage depend on the illumination intensity and on the LS duration. PSCs with mesoporous Al2O3 showed similar changes, validating the role of the compact TiO2. Faster generation and a gradual increase of Velec are apparent under LS, which expresses the constant migration of ions and vacancies toward the interface. The nonrigid TiO2-perovskite interface calls for a vital perspective change of PSCs.

Original languageEnglish
Pages (from-to)950-956
Number of pages7
JournalACS Energy Letters
Issue number5
StatePublished - 12 May 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.


The research of J.H. and L.G. received funding from the European Union Seventh Framework Program [FP7/2007-2013] under Grant Agreement 316494. We thank Hannah-Noa Barad, Adam Ginsburg, and David A. Keller for their assistance in substrate preparation and characterization. We acknowledge funding from MINECO of Spain under Project MAT2016-76892-C3-1-R and Generalitat Valenciana Project PROME-TEOII/2014/020.

FundersFunder number
Generalitat Valenciana Project PROME-TEOII/2014/020
Seventh Framework Programme316494
Ministerio de Economía y CompetitividadMAT2016-76892-C3-1-R
Seventh Framework Programme


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