Additive Effects of Copper and Alkali Metal Halides into Methylammonium Lead Iodide Perovskite Solar Cells

• Published in: Electronic materials letters Vol. 18; no. 2; pp. 176 - 186
• Main Authors: Suzuki, Atsushi, Kitagawa, Kaede, Oku, Takeo, Okita, Masanobu, Fukunishi, Sakiko, Tachikawa, Tomoharu
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.03.2022; Springer Nature B.V; 대한금속·재료학회
• Subjects: Characterization and Evaluation of Materials; Charge transfer; Chemistry and Materials Science; Circuits; Condensed Matter Physics; Copper; Copper chloride; Crystal structure; Current density; Decomposition reactions; Diffusion layers; Energy conversion efficiency; Halides; Materials Science; Metal halides; Morphology; Nanotechnology; Nanotechnology and Microengineering; Optical and Electronic Materials; Original Article - Energy and Sustainability; Perovskites; Photovoltaic cells; Short circuit currents; Solar cells; Valence band; 전자/정보통신공학; Morphology, X-ray diffraction; Perovskite solar cells; Photovoltaic properties
• ISSN: 1738-8090; 2093-6788
• DOI: 10.1007/s13391-021-00325-5

Fabrication and characterization of methylammonium lead iodide perovskite solar cells incorporated with formamidinium iodide, copper halides, alkali metal halides and decaphenylcyclopentasilane were performed. Addition of CuCl and KI at 2% into the perovskite layer offered compact morphologies and crystal orientation in the perovskite layer, improving short circuit current densities, series resistance and open-circuit voltages related to conversion efficiencies. The stabilities of conversion efficiencies were improved for the perovskite layer incorporated with 2% CuCl and 2% NaI. The stabilities depended on the state of the surface morphologies and crystal orientation while suppressing decomposition reaction in the perovskite layer. The photovoltaic mechanisms were associated with promotion of carrier generation and diffusion in the crystalline layer. The electronic correlation was based on the charge transfer between 5p orbital of I ion and 3d orbital of Cu ion near valence band, promoting the carrier generation and diffusion related to the short circuit current densities. Graphical Abstract