Light-induced conversion of an insulating refractory oxide into a persistent electronic conductor

被引:409
作者
Hayashi, K
Matsuishi, S
Kamiya, T
Hirano, M
Hosono, H
机构
[1] Japan Sci & Technol Corp, Exploratory Res Adv Technol, Transparent Electroact Mat Project, Tatatsu Ku, Kawasaki, Kanagawa 2130012, Japan
[2] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan
基金
美国国家科学基金会;
关键词
D O I
10.1038/nature01053
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Materials that are good electrical conductors are not in general optically transparent, yet a combination of high conductivity and transparency is desirable for many emerging opto-electronic applications(1-6). To this end, various transparent oxides composed of transition or post-transition metals (such as indium tin oxide) are rendered electrically conducting by ion doping(1-6). But such an approach does not work for the abundant transparent oxides of the main-group metals. Here we demonstrate process by which the transparent insulating oxide 12CaO.7Al(2)O(3) (refs 7-13) can be converted into an electrical conductor. H- ions are incorporated into the subnanometre-sized cages of the oxide by a thermal treatment in a hydrogen atmosphere; subsequent irradiation of the material with ultraviolet light results in a conductive state that persists after irradiation ceases. The photo-activated material exhibits moderate electrical conductivity (similar to0.3 S cm(-1)) at room temperature, with visible light absorption losses of only one per cent for 200-nm-thick films. We suggest that this concept can be applied to other main-group metal oxides, for the direct optical writing of conducting wires in insulating transparent media and the formation of a high-density optical memory.
引用
收藏
页码:462 / 465
页数:4
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