The visible transmittance and solar modulation ability of VO sub(2) flexible foils simultaneously improved by Ti doping: an optimization and first principle study

The Mott phase transition compound vanadium dioxide (VO sub(2)) shows promise as a thermochromic smart material for the improvement of energy efficiency and comfort in a number of applications. However, the use of VO sub(2) has been restricted by its low visible transmittance (T sub(vis)) and limite...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2013-09, Vol.15 (40), p.17537-17543
Main Authors: Chen, Shi, Dai, Lei, Liu, Jianjun, Gao, Yanfeng, Liu, Xinling, Chen, Zhang, Zhou, Jiadong, Cao, Chuanxiang, Han, Penggang, Luo, Hongjie, Kanahira, Minoru
Format: Article
Language:English
Subjects:
Doping
Expenses
Foils
Modulation
Optimization
Titanium
Transmittance
Vanadium oxides
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Summary:The Mott phase transition compound vanadium dioxide (VO sub(2)) shows promise as a thermochromic smart material for the improvement of energy efficiency and comfort in a number of applications. However, the use of VO sub(2) has been restricted by its low visible transmittance (T sub(vis)) and limited solar modulation ability ( Delta T sub(sol)). Many efforts have been made to improve both of these limitations, but progress towards the optimization of one aspect has always come at the expense of the other. This paper reports that Ti doping results in the improvement of both the T sub(vis) and Delta T sub(sol) of VO sub(2)-nanoparticle-derived flexible foils to the best levels yet reported. Compared with an undoped VO sub(2) foil, a 15% increase (from 46.1% to 53%) in T sub(vis) and a 28% increase (from 13.4% to 17.2%) in Delta T sub(sol) are achieved at a Ti doping level of 1.1%, representing the best performance reported for similar foils or films prepared using various methods. Only a defined doping level of less than 3% is beneficial for simultaneous improvement in T sub(vis) and Delta T sub(sol). First principle calculations suggest that an increase in the intrinsic band gap of VO sub(2) (M) and the reduced electron density at Fermi level of VO sub(2) (R) cooperate to result in the improvement of Delta T sub(sol) and that an enhancement in the optical band gap of VO sub(2) (M) leads to the increase of T sub(vis).
ISSN:1463-9076
1463-9084
DOI:10.1039/c3cp52009a