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A transparent electrochromic metal-insulator switching device with three-terminal transistor geometry

Proton and hydroxyl ion play an essential role for tuning functionality of oxides because their electronic state can be controlled by modifying oxygen off-stoichiometry and/or protonation. Tungsten trioxide (WO(3)), a well-known electrochromic (EC) material for smart window, is a wide bandgap insula...

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Autores principales: Katase, Takayoshi, Onozato, Takaki, Hirono, Misako, Mizuno, Taku, Ohta, Hiromichi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4865842/
https://www.ncbi.nlm.nih.gov/pubmed/27174791
http://dx.doi.org/10.1038/srep25819
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author Katase, Takayoshi
Onozato, Takaki
Hirono, Misako
Mizuno, Taku
Ohta, Hiromichi
author_facet Katase, Takayoshi
Onozato, Takaki
Hirono, Misako
Mizuno, Taku
Ohta, Hiromichi
author_sort Katase, Takayoshi
collection PubMed
description Proton and hydroxyl ion play an essential role for tuning functionality of oxides because their electronic state can be controlled by modifying oxygen off-stoichiometry and/or protonation. Tungsten trioxide (WO(3)), a well-known electrochromic (EC) material for smart window, is a wide bandgap insulator, whereas it becomes a metallic conductor H(x)WO(3) by protonation. Although one can utilize electrochromism together with metal-insulator (MI) switching for one device, such EC-MI switching cannot be utilized in current EC devices because of their two-terminal structure with parallel-plate configuration. Here we demonstrate a transparent EC-MI switchable device with three-terminal TFT-type structure using amorphous (a-) WO(3) channel layer, which was fabricated on glass substrate at room temperature. We used water-infiltrated nano-porous glass, CAN (calcium aluminate with nano-pores), as a liquid-leakage-free solid gate insulator. At virgin state, the device was fully transparent in the visible-light region. For positive gate voltage, the active channel became dark blue, and electrical resistivity of the a-WO(3) layer drastically decreased with protonation. For negative gate voltage, deprotonation occurred and the active channel returned to transparent insulator. Good cycleability of the present transparent EC-MI switching device would have potential for the development of advanced smart windows.
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spelling pubmed-48658422016-05-23 A transparent electrochromic metal-insulator switching device with three-terminal transistor geometry Katase, Takayoshi Onozato, Takaki Hirono, Misako Mizuno, Taku Ohta, Hiromichi Sci Rep Article Proton and hydroxyl ion play an essential role for tuning functionality of oxides because their electronic state can be controlled by modifying oxygen off-stoichiometry and/or protonation. Tungsten trioxide (WO(3)), a well-known electrochromic (EC) material for smart window, is a wide bandgap insulator, whereas it becomes a metallic conductor H(x)WO(3) by protonation. Although one can utilize electrochromism together with metal-insulator (MI) switching for one device, such EC-MI switching cannot be utilized in current EC devices because of their two-terminal structure with parallel-plate configuration. Here we demonstrate a transparent EC-MI switchable device with three-terminal TFT-type structure using amorphous (a-) WO(3) channel layer, which was fabricated on glass substrate at room temperature. We used water-infiltrated nano-porous glass, CAN (calcium aluminate with nano-pores), as a liquid-leakage-free solid gate insulator. At virgin state, the device was fully transparent in the visible-light region. For positive gate voltage, the active channel became dark blue, and electrical resistivity of the a-WO(3) layer drastically decreased with protonation. For negative gate voltage, deprotonation occurred and the active channel returned to transparent insulator. Good cycleability of the present transparent EC-MI switching device would have potential for the development of advanced smart windows. Nature Publishing Group 2016-05-13 /pmc/articles/PMC4865842/ /pubmed/27174791 http://dx.doi.org/10.1038/srep25819 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Katase, Takayoshi
Onozato, Takaki
Hirono, Misako
Mizuno, Taku
Ohta, Hiromichi
A transparent electrochromic metal-insulator switching device with three-terminal transistor geometry
title A transparent electrochromic metal-insulator switching device with three-terminal transistor geometry
title_full A transparent electrochromic metal-insulator switching device with three-terminal transistor geometry
title_fullStr A transparent electrochromic metal-insulator switching device with three-terminal transistor geometry
title_full_unstemmed A transparent electrochromic metal-insulator switching device with three-terminal transistor geometry
title_short A transparent electrochromic metal-insulator switching device with three-terminal transistor geometry
title_sort transparent electrochromic metal-insulator switching device with three-terminal transistor geometry
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4865842/
https://www.ncbi.nlm.nih.gov/pubmed/27174791
http://dx.doi.org/10.1038/srep25819
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