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2024/12/24

Press Release

Understanding and controlling the precursor solution of tin-containing perovskites enabled efficient multijunction photovoltaics

Summary

Our collaborative research group, comprising researchers from the University of Oxford, Kyoto University, the Institute for Molecular Science, RIKEN, and other institutions, has developed a method to desirably control the properties of perovskite precursor solutions. This advancement enabled the preparation of high-quality narrow-bandgap mixed-metal Sn-Pb perovskite films, achieving record-breaking performance in single-, double-, triple-, and quadruple-junction solar cell devices.

We developed a method to fabricate high-quality Sn-Pb perovskite semiconductor films by incorporating phenylalanine hydrochloride, a simple compound bearing both amino acid and carboxylic acid groups, into the precursor solutions. Through various spectroscopic measurements and theoretical calculations, we elucidated the mechanism of how the phenylalanine cation interacts with the constituent ions of perovskite and their composed species during the solution stages, providing a global improvement in the bulk and surface quality of the as-deposited films.

Single-, double-, and triple-junction solar cells incorporating these high-quality Sn-Pb perovskite layers achieved remarkable open-circuit voltages of 0.91 V, 2.22 V, and 3.46 V, respectively, and power conversion efficiencies of 23.9%, 29.7% (certified value: 29.26%), and 28.7%. Additionally, triple-junction devices with an area of 1 cm² demonstrated power conversion efficiencies of up to 28.4% (certified value: 27.28% by the National Institute of Advanced Industrial Science and Technology [AIST], Japan).

Furthermore, for the first time, all-perovskite four-junction devices were fabricated, achieving an impressive open-circuit voltage of 4.94 V and power conversion efficiencies of up to 27.9%.

Details: PDF

Financial Supports:

This research was supported by NEDO, JST-Mirai Program (JPMJMI22E2), and JSPS KAKENHI (JP21H04699, JP24H00481, JP22H05133, JP24K17663, JP24K01571) in Japanese groups.

Information of the paper:

Title: Steering perovskite precursor solutions for multijunction photovoltaics

Journal: Nature, (2024) DOI:10.1038/s41586-024-08546-y

Authors: Shuaifeng Hu, Junke Wang, Pei Zhao, Jorge Pascual, Jianan Wang, Florine Rombach, Akash Dasgupta, Wentao Liu, Minh Anh Truong, He Zhu, Manuel Kober-Czerny, James N. Drysdale, Joel A. Smith, Zhongcheng Yuan, Guus J. W. Aalbers, Nick R. M. Schipper, Jin Yao, Kyohei Nakano, Silver-Hamill Turren-Cruz, André Dallmann, M. Greyson Christoforo, James M. Ball, David P. McMeekin, Karl-Augustin Zaininger, Zonghao Liu, Nakita K. Noel, Keisuke Tajima, Wei Chen, Masahiro Ehara, René A. J. Janssen, Atsushi Wakamiya, and Henry J. Snaith

Contact persons:

Dr. Shuaifeng Hu
University of Oxford
E-mail: shuaifeng.hu_at_physics.ox.ac.uk (Please replace the "_at_" with @)

Prof. Masahiro Ehara
Institute for Molecular Science
TEL: 0564-55-7461 FAX: 0564-55-7025
E-mail: ehara_at_ims.ac.jp (Please replace the "_at_" with @)