TY - JOUR
T1 - Photovoltage Behavior in Perovskite Solar Cells under Light-Soaking Showing Photoinduced Interfacial Changes
AU - Hu, Jiangang
AU - Gottesman, Ronen
AU - Gouda, Laxman
AU - Kama, Adi
AU - Priel, Maayan
AU - Tirosh, Shay
AU - Bisquert, Juan
AU - Zaban, Arie
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/5/12
Y1 - 2017/5/12
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85028931771&partnerID=8YFLogxK
U2 - 10.1021/acsenergylett.7b00212
DO - 10.1021/acsenergylett.7b00212
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AN - SCOPUS:85028931771
SN - 2380-8195
VL - 2
SP - 950
EP - 956
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 5
ER -
