33Utilization of Two-Dimensional Perovskite Structure for AbstractOrganic-inorganic perovskite compounds are one of the artificially prepared hybrid materials, and they have attracted significant attention since the first report in photovoltaic solar cells by Miyasaka et. al.1 Although the perovskite compounds used for solar cells are limited, the organic-inorganic perovskites are a relatively large family, thanks to various combinations of organic and inorganic components. Our group have already succeeded in preparing organic-inorganic perovskite compounds having three-, two-, one-, and zero-dimensional (3D, 2D, 1D, and 0D) network of lead halide octahedra [PbX6]4- (X: Cl−, Br−, I−) using various kinds of organic amines.2 While Pb-based 3D perovskites have appropriate bandgap and long carrier diffusion length, however, they are easily affected by moisture, oxygen, and heat, and are susceptible to degradation by water. To overcome this problem, utilization of 2D and quasi-2D (q-2D) perovskites is promising. In this presentation, I would like to show our recent progress using q-2D perovskite research, especially control of orientation and replacement of Pb to Sn for stable and non-toxic solar cells.3,4 References[1] A. Kojima, K. Teshima, Y. Shirai, T. Miyasaka, J. Am. Chem. Soc. 2009, 131, 6050.[2] Y. Takeoka, D. B. Mitzi, Chapter 2 in Perovskite Photovoltaics and Optoelectronics: From Fundamentals to Advanced Applications, T. Miyasaka Ed., Wiley-VCH, Weinheim, 2021[3] D. Hishida, T. Chowdhury, R. Shimono, A. Saeki, G. Uzurano, A. Fujii, M. Yoshizawa-Fujita, M. Rikukawa, Y. Takeoka, ACS Appl. Energy Mater., 8, 5738 (2025). [4] C. Li, T. Chowdhury, Towhid, M. Yoshizawa-Fujita, M. Rikukawa, M. Yanagida, Y. Shirai, Y., Takeoka, ChemComm., 61, 6462 (2025) Acknowledgement Part of this work was supported by JST-ALCA-Next Program Grant Number JPMJAN23B2, Japan.Yuko TakeokaOptical ApplicationProfessor, Sophia University Prof. Dr. Yuko TAKEOKA is the Professor of the Department of Materials Science Sciences of Faculty of Science and Technology in Sophia University. She is also the director of Center for Research Promotion and Support of Sophia University. Personal History:Assistant Professor (2001-2006), Lecturer (2006-), Sophia University2002-2006 Researcher of Japan Science and Technology Agency2010-2018 Associate Professor, Since 2018 Professor, Sophia UniversityE-mail: y-tabuch@sophia.ac.jpResearch interests: Perovskite solar cells, Conjugated polymers, Biodegradable polymersInvited Talk 5
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