Overview of Si Tandem Solar Cells and Approaches to PV-Powered Vehicle Applications
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.66
Overview of Si Tandem Solar Cells and Approaches to PV-Powered Vehicle Applications Masafumi Yamaguchi1, Kan-Hua Lee1, Daisuke Sato1, Kenji Araki1, Nobuaki Kojima1, Tatsuya Takamoto2, Taizo Masuda3, and Akinori Satou3 1
Toyota Technological Institute, Nagoya, Japan
2
Sharp Corporation, Nara, Japan
3
Toyota Motor Corporation, Shizuoka, Japan
ABSTRACT
Development of high-efficiency solar cell modules and new application fields are significant for the further development of photovoltaics (PV) and creation of new clean energy infrastructure based on PV. Especially, development of PV-powered EV applications is desirable and very important for this end. This paper shows analytical results for efficiency potential of various solar cells for choosing candidates of high-efficiency solar cell modules for automobile applications. As a result of analysis, Si tandem solar cells are thought to be some of their candidates. This paper also overviews efficiency potential and recent activities of various Si tandem solar cells such as III-V/Si, II-VI/Si, chalcopyrite/Si, perovskite/Si and nanowire/Si tandem solar cells. The III-V/Si tandem solar cells are expected to have a high potential for various applications because of high efficiency with efficiencies of more than 36% for 2-junction and 42 % for 3-junction tandem solar cells under 1-sun AM1.5 G, lightweight and low-cost potential. Recent results for our 28.2 % efficiency and Sharp’s 33% mechanically stacked InGaP/GaAs/Si 3-junction solar cell are also presented. Approaches to automobile application by using III-V/Si tandem solar cells and static low concentration are presented.
INTRODUCTION The solar electricity including solar photovoltaics (PV) is expected to contribute to the primary energy with a share of about 20% and 70% in 2050 and 2100. It respectively
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occupies in the total energy of the world, according to the recommendation (World Energy Vision 2100) by the German Advisory Council on Global Change [1]. According to Shell’s “Sky Scenario” [2], cumulative capacity of PV power systems in the world by 2050 is 22TW. However, total cumulative capacity of PV power systemsin the world is only 500GW. These suggest the importance of further installation of PV power systems, and the importance of further development of science and technology and deployment of PV This paper presents our approaches to PV powered electric vehicle applications towards the creation of “Mobility Society by using Solar Energy.” For this end, the IIIV/Si tandem solar cell modules and static low concentrator PV modules are expected to provide high-efficiency and low-cost modules. This paper also overviews recent results and efficiency potential of Si tandem solar cells. IMPORTANCE OF PV-POWERED
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