22Prof. Masakazu Sugiyama is the director and a professor at Research Center for Advanced Science and Technology (RCAST), The University of Tokyo. He received the B.E., M.S., and Ph.D. degrees in Chemical Systems Engineering, all from the University of Tokyo, Japan, in 1995, 1997, and 2000, respectively. In 2000, he became a Research Associate at the Department of Chemical System Engineering, the University of Tokyo. In 2002, he joined the Department of Electronic Engineering as a Lecturer. He became an Associate Professor in 2005. In 2016, he was promoted to a full professor and then moved to RCAST in 2017. He has been appointed as the director of RCAST from 2022.His major research topics are high-efficiency photovoltaic (PV) devices using the nano-epitaxial structures of III-V compound semiconductors. He is a recognized leader in the sustainable conversion of solar energy to next-generation fuels. He is a program manager of Japanese MOONSHOT program, aiming to realize CO2 capture and conversion to chemical feedstocks driven by renewable electricity. He also participates in the scenario analysis of Net-Zero energy system beyond 2050. He authored and coauthored 320 refereed journal publications and 510 international conference papers. Photovoltaic for Carbon Neutrality: Device Innovation to System IntegrationAbstractTo mitigate global warming caused by the accumulation of CO2 and to pass on a sustainable society to the next generation, carbon neutrality is an essential goal. For the energy system, it is necessary to electrify energy demand as much as possible and to supply most of the electricity through solar and wind power generation. A scenario analysis on the carbon-neutral energy system in Japan quantifies the capacity of renewable power generation in 2050: approximately 400 – 680 GW of photovoltaic (PV) will be necessary, as well as approximately 200 GW of wind power including both on-shore and off-shore installations. Considering the limited flat land area in Japan and preservation of biodiversity, PV should not be limited to conventional rooftop and mega-solar installations, but novel technologies are highly demanded for implementing PV into widespread fields, among which building-integrated PV (BIPV) and the PV installation on the existing agricultural farms (agri-PV) will share the majority of future installations. It should be noted that light-weight and flexible PV modules do not always fit these emerging demands. BIPV needs tolerance against harsh environmental conditions and an extremely long lifetime, and glass modules will be the choice, for which light-weight PV cells cannot appeal their merit. Other than the requirement for low cost, the definitive target of future engineering will be high efficiency. On the other hand, film-style PV modules with a pay-back time (both energy and cost) of a couple of years may change the style of conventional agri-PV and will drastically accelerate its social implementation. In addition, terawatt-scale PV is indispensable worldwide to power green hydrogen production, which is another indispensable piece of a carbon-neutral energy system. For this purpose, tolerance against harsh environmental conditions is the primary requirement, as well as ultra-low cost. Masakazu SugiyamaDirector and Professor Invited Talk 1Research Center for Advanced Science and Technology, The University of Tokyo
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