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1、Thermochromic VO2 thin film for smart window,Y.J.Zhou,Y.C.Zhou T.Y.Zhou J.Q.zheng,group 21,Table of contents,Two questions！,Working principle VO2 undergoes reversible transition at critical temperature Tc (68) ; below 68 ，VO2 is semiconducting and relatively infrared transparent,and above Tc it is m
2、etallic and infrared reflecting.(NIR:0.78-2.5um),Resistance of a suspended VO2 nanobeam measured in a four-probe geometry as a function of temperature 1,1 Jinqian Wu,Qian Gu , Nanoletter,2006 Vol.6,No.10,2313-2317.2 Litao Kang, Yanfeng Gao, ACS,Applied material & interfaces, VOL. 1 NO. 10 22112218 2
3、009,Optical transmittance spectra of VO2 film 2,Methods of synthesis,Sol-gel method Chemical vapor deposition DC、RF&magnetron sputtering Pluse laser deposition,Sol-gel method,Mixing solution(HCl,N2H4,V2O5),Sol(Only VOCl2),Gel,Primaryproduct,5 Litao Kang,Yanfeng Gao,J.Phys.Chem.C ,2010,114,1901-1911,
4、Secondproduct,Finalproduct,Merits of Sol-gel method,Low cost,Sol-gel,Easyhandling,Ease fordoping,Large scaleprocess,Vaporization and Transport of Precursor Molecules into Reactor,Adsorption of Precursor Molecules to Surface,Decomposition of Precursor Molecules on Surface and Incorporation into Solid
5、 Films,Recombination of Molecular Byproducts and Desorption into Gas Phase,Chemical vapor deposition,Problems,Applications?,Q1:High MIPT temperature (68),Q2:Low visible transmittance (50%),Q3:Weak optical contrast in the IR region,Q4:Unfavorable color & Immature processing,God is impartial , who endows a kind of material with outstanding properties wh- ile in turn hard to prepare.,-Y.J.Zhou,For us,Many thanks for your attention ！,