Study of Lead-Free Perovskite Photoelectric Devices with TiO 2 as a Buffer Layer

Rade Tomov and Mariya Aleksandrova ()
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Rade Tomov: Department of Microelectronics, Technical University of Sofia, 1000 Sofia, Bulgaria
Mariya Aleksandrova: Department of Microelectronics, Technical University of Sofia, 1000 Sofia, Bulgaria

Sustainability, 2022, vol. 14, issue 16, 1-14

Abstract: In this work, a titanium oxide buffer layer was explored as a possible buffer electron transporting layer (ETL) with iodine-tin-based perovskite material for enhancement of a thin-film lead-free perovskite solar cell. The open-circuit voltage of the device was used as an indicator for the interface energy barrier’s change with the thickness of the TiO 2 . The buffer and photoabsorbing layers were deposited by vacuum reactive sputtering and a low-temperature ion-assisted process from a confocal sintered source, respectively, allowing precise tuning of the film properties and reproducibility of the solar cell behavior. The surface roughness of the buffer layers was investigated by atomic force microscopy and together with the measured absorbance spectra conclusions about the optical losses in the device were made. It was found that the highest voltage was generated from the structure with 75 nm-thick ETL. The electrical behavior of the cell with this buffer layer was additionally studied by impedance measurements. Small interface capacitance and contact resistance were obtained and considered suitable for photodetector fabrication. The practical applicability of the structure with a dual function of self-powered photodetection was demonstrated by the measurement of the response time.

Keywords: electron transporting layer (ETL); TiO 2 nanocoatings; lead-free perovskite solar cell; photoelectric device (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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