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Research Paper

Applied Science and Convergence Technology 2022; 31(6): 161-163

Published online November 30, 2022

https://doi.org/10.5757/ASCT.2022.31.6.161

Copyright © The Korean Vacuum Society.

Guanidinium Cation Substitution Effects on Perovskite Solar Cells

Jaewon Oh , Muntae Hwang , Hyunbok Lee , and Mee-Yi Ryu*

Department of Physics, Kangwon National University, Chuncheon 24341, Republic of Korea

Correspondence to:myryu@kangwon.ac.kr

Received: October 24, 2022; Revised: November 17, 2022; Accepted: November 18, 2022

Abstract

Combining different cations is a suitable strategy to improve the efficiency and stability of organic-inorganic halide perovskite-based solar cells. In this study, we fabricated and characterized MAPbI3 perovskite films and solar cells containing guanidinium (GA). X-ray diffraction measurements confirmed that partial substitution of GA cations was successfully performed through a solution process. Substitution of a small amount of GA improved the optical properties along with the reduction of defects in the perovskite film. As a result, all photovoltaic parameters were enhanced to achieve a power conversion efficiency of up to 17.23 %. However, excessive GA substitution causes aggregation of low-dimensional GAPbI3, thereby impairing device properties.

Keywords: Perovskite, Guanidinium, Cation, Substitution, Photovoltaic

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