Nanowire-based electrochromic devices

This report presents studies performed on high contrast electrochromic devices based on WO 3 nanowires. The devices were made in two formats. The first kind was made with vertically oriented nanowires grown on fluorinated tin oxide (FTO) coated glass substrates using a low pressure hot filament CVD...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2007-05, Vol.91 (9), p.813-820
Main Authors: Gubbala, S., Thangala, J., Sunkara, M.K.
Format: Article
Language:English
Subjects:
Applied sciences
CVD
Electrochromics
Energy
Exact sciences and technology
Miscellaneous
Nanowires
Natural energy
Photovoltaic conversion
Solar cells. Photoelectrochemical cells
Solar energy
WO 3
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Summary:This report presents studies performed on high contrast electrochromic devices based on WO 3 nanowires. The devices were made in two formats. The first kind was made with vertically oriented nanowires grown on fluorinated tin oxide (FTO) coated glass substrates using a low pressure hot filament CVD process. The devices made with these substrates showed a highly reversible transmission modulation of over 70% with almost 0% transmission in the colored state, at a wavelength of 700 nm. In the second kind of devices, made using dispersed nanowires in a mat-like format, a transmission modulation of over 50% was observed in the same wavelength regime. The bleaching times of electrodes with high densities of nanowire arrays showed a large dependence of bleaching timescales based on the coloration timescales used. Beyond the observed enhancement in the optical transmission contrast characteristics, the coloration and bleaching timescales can be further improved by optimizing the nanowire array characteristics such as their densities and aspect ratios.
ISSN:0927-0248
1879-3398
DOI:10.1016/j.solmat.2007.01.016