Tetsuya Asano
Panasonic
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Publication
Featured researches published by Tetsuya Asano.
IEEE Journal of Photovoltaics | 2014
Hidekazu Arase; Akio Matsushita; Akihiro Itou; Tetsuya Asano; Nobuhiko Hayashi; Daijiro Inoue; Ryutaro Futakuchi; Kazuo Inoue; Tohru Nakagawa; Masaki Yamamoto; Eiji Fujii; Yoshiharu Anda; Hidetoshi Ishida; Tetsuzo Ueda; Onur Fidaner; Michael W. Wiemer; Daisuke Ueda
We propose a novel concept of thin and compact CPV modules in which submillimeter solar cells are directly attached to lens arrays without secondary optics or an extra heat sink. With this small cell size, the optical path length of the module can be brought down to one-twentieth that of conventional CPV modules. To achieve precise alignment of the microsolar cells at the lens focal points, we have developed a fluidic self-assembly technique that utilizes surface tension. This novel CPV module with triple junction microsolar cells demonstrated an efficiency of 34.7% under sunlight in the particular measured condition.
Applied Physics Letters | 2014
Onur Fidaner; Ferran Suarez; Michael W. Wiemer; Vijit A. Sabnis; Tetsuya Asano; Akihiro Itou; Daijiro Inoue; Nobuhiko Hayashi; Hidekazu Arase; Akio Matsushita; Tohru Nakagawa
We demonstrate high efficiency triple junction solar cells with submillimeter dimensions in an all-back-contact architecture. 550 × 550 μm2 cells flash at 41.3% efficiency under the air mass 1.5 direct normal spectrum at 50 W/cm2 at 25 °C. Compared to standard size production cells, the micro cells have reduced performance at 1-sun due to perimeter recombination, but the performance gap closes at higher concentrations. Micro cells integrated with lens arrays were tested on-sun with an efficiency of 34.7%. All-back-contact architecture and submillimeter dimensions are advantageous for module integration and heat dissipation, allowing for high-performance, compact, lightweight, and cost-effective concentrated photovoltaic modules.
Japanese Journal of Applied Physics | 2014
Akihiro Itou; Tetsuya Asano; Daijiro Inoue; Hidekazu Arase; Akio Matsushita; Nobuhiko Hayashi; Ryutaro Futakuchi; Kazuo Inoue; Masaki Yamamoto; Eiji Fujii; Tohru Nakagawa; Yoshiharu Anda; Hidetoshi Ishida; Tetsuzo Ueda; Onur Fidaner; Michael W. Wiemer; Daisuke Ueda
We have developed a compact concentrator photovoltaic (CPV) module that comprises micro-solar cells with an area of ≈0.6 × 0.6 mm2 sandwiched between a 20-mm-thick lens array and a 1-mm-thick circuit board with no air gap. To establish electrical connections between the circuit board and the micro-solar cells, we developed a micro-solar cell with positive and negative electrodes on the lower face of the cell. In this study, we demonstrated the photovoltaic performance of the micro-solar cell closely approaches that of the standard solar cell measuring ≈5 × 5 mm2 commonly used in conventional CPVs under concentrated illumination. Our study showed that the negative effect on PV performance of perimeter carrier recombination in the micro-solar cell was insignificant under concentrated illumination. Finally, we assembled our micro-solar cells into a CPV module and achieved the module energy conversion efficiency of 34.7% under outdoor solar illumination.
ACS Applied Materials & Interfaces | 2017
Tetsuya Asano; Yukihiro Kaneko; Atsushi Omote; Hideaki Adachi; Eiji Fujii
We demonstrated the field-effect conductivity modulation of a gold thin film by all-solid-state electric-double-layer (EDL) gating at room temperature using an epitaxially grown oxide fast lithium conductor, La2/3-xLi3xTiO3 (LLT), as a solid electrolyte. The linearly increasing gold conductivity with increasing gate bias demonstrates that the conductivity modulation is indeed due to carrier injection by EDL gating. The response time becomes exponentially faster with increasing gate bias, a result of the onset of nonlinear ionic transportation. This nonlinear dynamic response indicates that the ionic motion-driven device can be much faster than would be estimated from a linear ionic transport model.
Advanced Materials | 2018
Tetsuya Asano; Akihiro Sakai; Satoru Ouchi; Masashi Sakaida; Akinobu Miyazaki; Shinya Hasegawa
New lithium halide solid-electrolyte materials, Li3 YCl6 and Li3 YBr6 , are found to exhibit high lithium-ion conductivity, high deformability, and high chemical and electrochemical stability, which are required properties for all-solid-state battery (ASSB) applications, particularly for large-scale deployment. The lithium-ion conductivities of cold-pressed powders surpass 1 mS cm-1 at room temperature without additional intergrain or grain boundary resistances. Bulk-type ASSB cells employing these new halide solid electrolyte materials exhibit coulombic efficiencies as high as 94% with an active cathode material of LiCoO2 without any extra coating. These superior electrochemical characteristics, as well as their material stability, indicate that lithium halide salts are another promising candidate for ASSB solid electrolytes in addition to sulfides or oxides.
photovoltaic specialists conference | 2013
Masaki Yamamoto; Ryutaro Futakuchi; Kazuo Inoue; Hidekazu Arase; Akio Matsushita; Akihiro Itoh; Tetsuya Asano; Nobuhiko Hayashi; Daijiro Inoue; Tohru Nakagawa; Eiji Fujii; Daisuke Ueda
Due to its higher photovoltaic efficiency, CPV has the advantage of needing a smaller panel footprint than fixed PV systems. This characteristic makes it ideal for use as an independent power supply in remote locations where transportation and site procurement present a challenge. The overall system needs to be compact and light without sacrificing weather resistance. Skilled personnel are scarce in remote areas, so easy setup and maintenance are also important. We have developed two techniques based on the notion of bio-mimicry. One is machine learning to counteract errors in installation position without the need for human intervention, and the other is a three-dimensional panel structure that cuts the wind load by up to 20%. We describe our experimental results gained in field tests.
Archive | 2016
Hiroki Takeuchi; Yuji Zenitani; Tetsuya Asano
Archive | 2015
Takashi Nishihara; Yuji Zenitani; Tetsuya Asano; Akihiro Itoh; Tomoyuki Komori; Hideaki Adachi; Eiji Fujii
Archive | 2015
Yuji Zenitani; Takashi Nishihara; Tetsuya Asano; Akihiro Itou; Saifullah Badar
Archive | 2015
Tetsuya Asano; Tomoyuki Komori