Materials and interface engineering for inorganic halide perovskite photovoltaics
Tsutomu Miyasaka a
a Toin University of Yokohama, Graduate School of Engineering, 1614 Kuroganecho, Aoba, Yokohama, 225-8503, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP23)
Kobe, Japan, 2023 January 22nd - 24th
Organizers: Seigo Ito, Hideo Ohkita and Atsushi Wakamiya
Invited Speaker, Tsutomu Miyasaka, presentation 018
Publication date: 21st November 2022

Since perovskite solar cell (PSC) achieved high efficiency over 25%, fundamental studies of PSCs have been directed to stability and durability improvement by defect passivation and interfacial modification while efficiency development is becoming a major issue for large area modules and muti-junction tandem cells.1 We have been tackling interfacial passivation with functional organic molecules, particularly focusing on the method of enabling high voltage output (close to theoretical limit) in photovoltaic performance.2 In compositional engineering, inorganic perovskites are promising in the viewpoints of high thermal stability and potentially high stability against light-assisted phase segregation. Besides the perovskite composition, use of diffusible dopants in hole transport materials (HTMs) are responsible for low stability of perovskites at high temperatures (>120oC). In this respect, use of dopant-free HTMs for all-inorganic perovskite absorbers is highly desired. CsPbI2Br perovskites in combination of dopant-free polymer HTMs achieved PCEs of >17% under 1 sun and >34% under indoor LED illumination, supported by high Voc values and low voltage deficits.3 Phase segregation in CsPbI2Br is less than those for hybrid perovskite and it was not observed under indoor light circumstance. Therefore, inorganic PSCs are promising for applications to the IoT industry. Creation of new inorganic perovskite materials includes lead-free compositions. As a typical composition, Ag-Bi-halide (sulfide) system is an important target for achieving environmentally kind PSCs, where the method to achieve high Voc by interfacial passivation is the key to high efficiency.4

Applications of PSCs in space environments attract attentions because thin perovskite photovoltaic films demonstrate high stability and tolerance against exposure to high energy particle irradiations (proton and electron beams).5 Thin absorbers (<500 nm) avoid accumulation of particles and due to intrinsic defect tolerant nature of perovskites, radiation-induced collision damage is highly suppressed. Based on our current R&Ds, future perspectives of perovskite photovoltaics will be presented.

1. T. Miyasaka, editor, Perovskite Photovoltaics and Optoelectronics ―From Fundamentals to Advanced Applications―, Wiley-VCH, Weinheim, 2021, ISBN: 978-3-527-34748-3.

2. G. M. Kim, H. Sato, Y. Ohkura, A. Ishii, and T. Miyasaka, Adv. Energy Mat. 2022, 12, 2102856.

3. Z. Guo, A. K. Jena, I. Takei, M. Ikegami, A. Ishii, Y. Numata, N. Shibayama, T. Miyasaka, Adv. Func. Mat. 2021, 31, 2103614.

4. T. Miyasaka, A. Kulkarni, Gyu Min Kim, Senol Öz, A. K. Jena, Adv. Energy. Mat. 2019, 1902500.

5. Y. Miyazawa, M. Ikegami, H.-W. Chen, T. Ohshima, M. Imaizumi, K. Hirose, T. Miyasaka, iScience 2018, 2, 148.

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