High Performance Perovskite Solar Cells and Modules: Current Situation and Future Prospects
Hiroshi Segawa a
a RCAST, The University of Tokyo
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP24)
Tokyo, Japan, 2024 January 21st - 23rd
Organizers: Qing Shen and James Ryan
Keynote, Hiroshi Segawa, presentation 106
DOI: https://doi.org/10.29363/nanoge.iperop.2024.106
Publication date: 18th October 2023

Organometal halide perovskite is a promising material for the light-weight and high-efficiency solar cells. In this lecture, current situation and future prospects of the high performance perovskite solar cells and modules are summarized. Through the many studies related to the organometal halide perovskite solar cells (PSCs), the composition of the organometal halide perovskite is recognised as one of the key factors in the improvement of the stability and efficiency. Many groups investigated mixed cation and mixed halogen perovskite absorber toward the high efficiency, whereas unexpected ion migration and/or phase segregation were observed. For the improvement of the stability, several approaches have been investigated. In our study, K+-doped perovskite is good for the stabilization with keeping relatively high performance. It can be stabilized to some extent where it is not decomposed after 10, 000 h of heating. The crystal lattice structure of the organometal halide perovskite is also important for both absorption and photophysics of them, whereas the micro-structural aspects within the simple organometal halide perovskite are still controversial issue. In our study, direct observation of the microstructure of the thin film organometal halide perovskite using transmission electron microscopy was investigated. Unlike previous reports, it is identified that the tetragonal and cubic phases coexist at room temperature, and it is confirmed that superlattices composed of a mixture of tetragonal and cubic phases are selforganized without a compositional change. The organometal halide perovskite self-adjusts the configuration of phases and automatically organizes a buffer layer at boundaries by introducing a superlattice. These results show the fundamental crystallographic information for the organometal halide perovskite and demonstrates new possibilities toward high performance perovskite solar cells.


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