Tin Oxide Modified Titanium Dioxide as Electron Transport Layer in Formamidinium-Rich Perovskite Solar Cells

Richard K. Koech, Reisya Ichwani, Deborah Oyewole, Moses Kigozi, Daniel Amune, Dahiru M. Sanni, Sharafadeen Adeniji, Kehinde Oyewole, Abdulhakeem Bello, Esidor Ntsoenzok and Wole Soboyejo
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Richard K. Koech: Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA
Reisya Ichwani: Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA
Deborah Oyewole: Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA
Moses Kigozi: Department of Materials Science and Engineering, African University of Science and Technology, Km. 10 Airport Road, Abuja 900107, Nigeria
Daniel Amune: Department of Materials Science and Engineering, African University of Science and Technology, Km. 10 Airport Road, Abuja 900107, Nigeria
Dahiru M. Sanni: Department of Theoretical and Applied Physics, African University of Science and Technology, Km. 10 Airport Road, Abuja 900107, Nigeria
Sharafadeen Adeniji: Department of Theoretical and Applied Physics, African University of Science and Technology, Km. 10 Airport Road, Abuja 900107, Nigeria
Kehinde Oyewole: Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA
Abdulhakeem Bello: Department of Materials Science and Engineering, African University of Science and Technology, Km. 10 Airport Road, Abuja 900107, Nigeria
Esidor Ntsoenzok: CEMHTI-CNRS Site Cyclotron, 3A Rue de la Férollerie, 45071 Orléans, France
Wole Soboyejo: Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA

Energies, 2021, vol. 14, issue 23, 1-13

Abstract: The design of electron transport layers (ETLs) with good optoelectronic properties is one of the keys to the improvement of the power conversion efficiencies (PCEs) and stability of perovskite solar cells (PSCs). Titanium dioxide (TiO 2 ), one of the most widely used ETL in PSCs, is characterized by low electrical conductivity that increases the series resistance of PSCs, thus limiting their PCEs. In this work, we incorporated tin oxide (SnO 2 ) into titanium dioxide (TiO 2 ) and studied the evolution of its microstructural and optoelectronic properties with SnO 2 loading. The thin films were then integrated as ETLs in a regular planar Formamidinium (FA)-rich mixed lead halide PSCs so as to assess the overall effect of SnO 2 incorporation on their charge transport and Photovoltaic (PV) characteristics. Analysis of the fabricated PSCs devices revealed that the best performing devices; based on the ETL modified with 0.2 proportion of SnO 2; had an average PCE of 17.35 ± 1.39%, which was about 7.16% higher than those with pristine TiO 2 as ETL. The improvement in the PCE of the PSC devices with 0.2 SnO 2 content in the ETL was attributed to the improved electron extraction and transport ability as revealed by the Time Resolved Photoluminescence (TRPL) and Electrochemical Impedance Spectroscopy (EIS) studies.

Keywords: electron transport layer; titanium dioxide; tin oxide; perovskite solar cell; charge transport; power conversion efficiency; photoluminescence (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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