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Analysis of the UV–Ozone‐Treated SnO 2 Electron Transporting Layer in Planar Perovskite Solar Cells for High Performance and Reduced Hysteresis
Author(s) -
Méndez Perla Fabiola,
Muhammed Salim K. M.,
Barea Eva M.,
Masi Sofia,
Mora-Seró Iván
Publication year - 2019
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201900191
Subject(s) - perovskite (structure) , materials science , crystallinity , hysteresis , wetting , perovskite solar cell , optoelectronics , layer (electronics) , energy conversion efficiency , chemical engineering , tin oxide , nanotechnology , composite material , doping , physics , quantum mechanics , engineering
Tin oxide (SnO 2 ) is widely used as an electron transporting layer (ETL) in perovskite solar cells (PSCs) because of its good transparency, band alignment to perovskite, and stability. The interface between the ETL and the perovskite in the PSCs affects the charge extraction process and influences the optoelectronic properties. Surface treatment of SnO 2 , such as the UV–ozone (UVO) treatment, is shown to enhance the efficiency and reduce the light soaking effect of the PSCs. Herein, the success in control and suppressing hysteresis reaching the highest photoconversion efficiency of 19.4% with negligible hysteresis for the growth of the devices on SnO 2 treated with UVO for 60 min is reported. The wettability of the treated SnO 2 is well matched with the polar solvent of the perovskite solution, leading to complete coverage of the substrate, although the treatment does not affect the morphology and the crystallinity of the perovskite thin films. Impedance spectroscopy measurement analysis clearly indicates the decrease in the recombination rate after the UVO treatment and the reduction in low frequency capacitance causing a reduction in the current–potential curve hysteresis.