Next generation of perovskite PV with all-inorganic absorbers and dopant-free hole transporters
Tsutomu Miyasaka a
a Toin University of Yokohama, Yokohama, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
Tsukuba-shi, Japan, 2020 January 20th - 22nd
Organizers: Michio Kondo and Takurou Murakami
Invited Speaker, Tsutomu Miyasaka, presentation 107
Publication date: 14th October 2019

Enormous efforts have been made in the last 8 years to up-grade the performance of lead halide hybrid perovskite solar cells (PSCs).1 Although efficiency level has reached 25%, PSCs face serious challenges of practical stability and durability required for industrialization. Compositional engineering of lead halide perovskites by mixing different cations and anions, using modulator molecules and mixing 2D and 3D structures have improved the stability of perovskites against heat and moisture. However, organic cations in halide perovskites (methylammonium, etc.) and use of diffusible ionic dopants in hole transport materials (HTMs) are responsible for low stability of perovskites at high temperatures (>120oC). In this respect, use of all-inorganic perovskite materials and dopant-free HTMs is highly desired.2 We have conducted some work in this direction which includes stabilization of CsPbI3 black phase3 and use of dopant-free HTMs. We could show that PSCs with all-inorganic perovskites and dopant-free HTMs are capable of efficiency up to 15%.2 Further, Open-circuit voltage was found to be enhanced over 1.4V. In preparation of all-inorganic perovskites, a big challenge should be directed to development of lead-free perovskite materials for environmental safety in practical applications.2

Among extensive applications of PSCs for outdoor and indoor power generation, use of PSCs in space environments is also promising because thin perovskite photovoltaic films demonstrate high stability and tolerance against exposure to severe space environment having high energy particle irradiations (proton and electron beams).4 Thin absorbers (<500 nm) avoid accumulation of particles and due to intrinsic defect tolerant nature of perovskites, radiation-induced collision damage is highly suppressed. Our current efforts in making PSCs based on both lead and lead-free perovskites, and future perspectives of perovskite photovoltaics will be introduced.



1. A. K. Jena, A.,Kulkarni, T. Miyasaka, Chem. Rev. 2019, 119, 3036–3103.

2. T. Miyasaka, A. Kulkarni, Gyu Min Kim, Senol Öz, and A. K. Jena, Adv. Energy. Materials 2019, 1902500, 1-20.

3. A. K. Jena, A. Kulkarni, Y. Sanehira, M. Ikegami, and T. Miyasaka, Chem. Mater. 2018, 30,


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