K
Kazutaka Nishikawa
Researcher at Toyota
Publications - 25
Citations - 609
Kazutaka Nishikawa is an academic researcher from Toyota. The author has contributed to research in topics: Radiative transfer & Quantum dot. The author has an hindex of 11, co-authored 23 publications receiving 496 citations. Previous affiliations of Kazutaka Nishikawa include Toyota Technological Institute & Osaka University.
Papers
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Experimental investigation of radiative thermal rectifier using vanadium dioxide
TL;DR: In this article, a radiative thermal rectifier with a thin film of vanadium dioxide (VO2) deposited on the silicon wafer is presented, and a rectification contrast ratio as large as two is accurately obtained by utilizing a one-dimensional steady-state heat flux measurement system.
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Dynamic Modulation of Radiative Heat Transfer beyond the Blackbody Limit.
TL;DR: The presented methodology to form a nanometric gap with functional heat flux paves the way to the smart thermal management in various scenes ranging from highly integrated systems to macroscopic apparatus.
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Multilevel radiative thermal memory realized by the hysteretic metal-insulator transition of vanadium dioxide
TL;DR: In this paper, a Preisach model was developed to explain the hysteretic radiative heat transfer between a VO2 film and a fused quartz substrate, and a multilevel thermal memory was demonstrated.
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A hot-carrier solar cell with optical energy selective contacts
Daniel J. Farrell,Yasuhiko Takeda,Kazutaka Nishikawa,Tomonori Nagashima,Tomoyoshi Motohiro,Ned Ekins-Daukes +5 more
TL;DR: In this paper, the authors proposed a method of utilizing hot-carriers within a photovoltaic device in which energy is extracted optically from a hotcarrier distribution rather than through the usual approach of electrical conduction.
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Extremely long carrier lifetime over 200 ns in GaAs wall-inserted type II InAs quantum dots
Kazutaka Nishikawa,Yasuhiko Takeda,Tomoyoshi Motohiro,Daisuke Sato,Junya Ota,Naoya Miyashita,Yoshitaka Okada +6 more
TL;DR: In this article, the authors proposed a concept for IB absorbers using GaAs wall-inserted type II InAs quantum-dots (QDs), in which electrons at the IB of the InAs QDs and holes in the valence band of the GaAsSb layers are farther separated compared to those in conventional type II QDs.