Prof Tsutomu MIYASAKA

Prof Tsutomu MIYASAKA

Toin University of Yokohama Graduate School of Engineering, Japan

Area 3: Organo-metal-halide Perovskite Solar Cells – Past, Present, and Future

Organo metal halide perovskites, represented by CH3NH3PbX3 (X=Br, I), are ionic crystals exhibiting multi-functions in photovoltaic power generation and optoelectronics with high extinction coefficient, 105 cm-1, for visible light. In 2008 we fabricated the first perovskite solid-state photovoltaic cell with a carbon-polymer composite hole transport material. Rapid progress in preparation of high quality perovskite crystals enabled power conversion efficiency (PCE) to reach 22%. Our group has focused on low temperature-based high throughput process and design of perovskite cells with stable hysteresis-less performance. We made plastic film-based flexible perovskite cells by using SnO2 and brookite TiO2 as electron collectors, which work with non-hysteretic PCE>13% with high mechanical stability against bending. Formamidinium-based perovskites are promising materials with good heat resistance and are capable of PCE of 20% and more. However, lead-free new materials are sought after as next direction of printable hybrid perovskite materials. My talk will present metal oxide-based lead halide perovskite cells with high stability and performance and lead-free type perovskite cells as a new direction.


Tsutomu Miyasaka received his Ph.D. degree in engineering from The University of Tokyo in 1981, and joined Fuji Photo Film, Co. where he conducted R&Ds on high sensitivity photographic materials, lithium-ion secondary batteries, and design of an artificial photoreceptor, all of which were based on electrochemistry and photochemistry. In 2001, he joined Toin University of Yokohama (TUY), Japan, Graduate School of Engineering, to continue photoelectrochemistry. From 2006 to 2009 he was dean of the Graduate School. From 2005 to 2010, he served as guest professor at The University of Tokyo. Main topic of his research has been design of solution-printable and lightweight flexible photovoltaic (PV) cells. In 2004 he established a TUY-based company, Peccell Technologies and served as CEO till 2009. Since the discovery of organic inorganic perovskite as PV absorber in 2006, he has focused his research on the organo lead halide perovskite PV cells, both for analysis of optoelectronic properties and design of high performance solar cell. He was a recipient of Ministry of Science & Education award on his achievements of green sustainable solar cell technology in 2009. Lecturing and publishing widely, he has directed R&D teams of national research programs, NEDO and JST, on dye-sensitized and hybrid solar cells.