Journal
IEEE JOURNAL OF PHOTOVOLTAICS
Volume 9, Issue 1, Pages 200-206Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2018.2877002
Keywords
Electron transport layer (ETL); oxidation states; oxygen adsorption; perovskite solar cells (PSCs); X-ray photoelectron spectroscopy (XPS)
Funding
- National Natural Science Foundation of China [61421002, 61574029, 61471085, 61474015]
- University of Kentucky
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Although SnO2 is widely used in perovskite solar cells (PSCs) as the electron transport layer, there is still a need for a detailed investigation regarding the impact of physisorption on the performance of PSCs. Here, we report the role of physisorption of oxygen species from the ambient atmosphere in the oxidation states and defective oxides at the surface of SnO2 nanoparticles for the performance of PSCs. The SnO2 nanoparticle's thin film shows a higher oxidation state (Sn-O) and lower charge trap sites at an annealing temperature of 100 degrees C, and the SnO(2 )film based PSCs yield an efficiency of 18.04%. The annealing process results in the gradual desorption of physically adsorbed oxygen species. Therefore, the annealing process of SnO2 nanoparticle thin films in atmosphere is the key factor to control the oxidation states and defective oxides at the surface of SnO2 nanoparticle thin films.
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