Optical And Electrical Properties Of Amorphous LixWO3 Films

Junichi Nagai

doi:10.1117/12.949910

6 March 1989 Optical And Electrical Properties Of Amorphous Li_xWO₃ Films

Junichi Nagai

Proceedings Volume 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII; (1989) https://doi.org/10.1117/12.949910
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

Amorphous thin films of Li.W03 are investigated to de,termine optical and electrical properties together with their photoelectrochemical behaviors. Optical spectra of the colorations in amorphous Li_xW0₃ films were consistent with EMT (Effective Medium Theory) on the assumption that spheres of Drude-like metallic tungsten bronzes (LiW0₃) and tungsten oxides(WO₃) are randomly mixed. EMT also predicts the percolation threshold at x>x_c where insulator-metal transition of dc-conductivity occurs at x>xc. These features give new insight on the nature of optical and electrical properties of amorphous tungsten bronzes. DC-conductivity of Li_xW0₃ was strongly dependent on the deposition conditions of the W0₃ films. Dense W03 film deposited under higher vacuum showed higher dc-conductivity and was less sensitive to UV light. Photoelectrochemical coloring of dense WO3 was lower than porous( and highly disordered) W0₃. This phenomena could be primarily ascribed to the high electron mobility so that it can be easy to recombine the photogenarated electrons and holes. Consequently it was proved that the electronic states in disordered amorphous WO₃ structure played important roles on photoelectrochemistry of W0₃/electrolyte interface.

Citation Download Citation

Junichi Nagai "Optical And Electrical Properties Of Amorphous Li_xWO₃ Films", Proc. SPIE 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII, (6 March 1989); https://doi.org/10.1117/12.949910

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