Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (2): 185-190.doi: 10.15541/jim20160273

• Orginal Article • Previous Articles     Next Articles

Electrochromic Properties of PEG-modified Tungsten Oxide Thin Films

Shu-Juan LU(), Chang WANG, Bo-Wen ZHAO, Hao WANG(), Jing-Bing LIU, Hui YAN   

  1. College of Materials Science & Engineering, Beijing University of Technology, Beijing 100124, China
  • Received:2016-04-21 Revised:2016-07-04 Online:2017-02-20 Published:2017-01-13
  • About author:LU Shu-Juan. E-mail: lushujuan@emails.bjut.edu.cn

Abstract:

To improve the electrochromic properties of WO3 thin films, polyethylene glycol (PEG)-modified WO3 films via Sol-Gel method were prepared on indium-tin oxide (ITO) glass using dipping-coating technique with post annealing treatment in air. Crystal structures and morphologies of the as-prepared films were investigated by means of X-ray diffraction (XRD) and scanning electron microscope (SEM). Optical properties and cyclic voltage-current characteristic of the films were experimentally studied. Compared with the corresponding neat WO3 films, the PEG-modified WO3 films exhibit superior electrochromic properties, which possesses longer lifetime after 5000 cycles without obvious degradation, as well as higher optical modulation up to 71% at the wavelength of 633 nm. The results suggest that PEG addition in conjunction with post annealing treatment may change the micro-structure of WO3 films to increase the electrochromic properties, due to the enhancement of ion diffusion capacity in the electrochromic material, as evident from the formation of the porous structure with an average pore diameter of 9 nm. As cycling stability is very crucial for practical applications of electrochromic materials, particularly for smart windows, this research provides a promising low-cost wet-chemical route to high performance WO3-based electrochromic devices.

Key words: WO3 thin film, electrochromism, Sol-Gel, PEG-modified

CLC Number: 

  • TQ174