Modifying Precursor Solutions to Obtain Screen-Printable Inks for Tungsten Oxides Electrochromic Film Preparation

Coatings

Tian Qiu¹  Zhuohui Xu²  Dongxiang Luo³  Kaiyue Guo⁴  Muyun Li⁴  Guanguang Zhang⁴  Rihui Yao⁴  Yujie Long⁴  Honglong Ning⁴  Junbiao Peng⁴ 

[1] Department of Intelligent Manufacturing, Wuyi University, Jiangmen 529020, China;Guangxi Key Lab of Agricultural Resources Chemistry and Biotechnology, Yulin Normal University, Yulin 537000, China;School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China;State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640, China;

关键词: electrochromic;    screen printing;    polyvinyl alcohol (PVA);    2-perfluoroalkyl ethanol (FSO);    ink formulas;   

DOI  :  10.3390/coatings11080872

来源: DOAJ

【 摘 要 】

Tungsten trioxide (WO₃) is used to prepare the important electrochromic layer of the electrochromic device as a wide bandgap semiconductor material. In this study, WO₃ electrochromic film was successfully prepared by screen printing. To modify the thixotropy and wettability of the ink, polyvinyl alcohol (PVA) and 2-perfluoroalkyl ethanol (FSO) were added in the ammonium meta-tungstate (AMT) solution. We found that the PVA additive could improve the dynamic viscosity of the solution and modify the uniformity of the film. 2-Perfluoroalkyl ethanol (FSO) could lower the surface tension and increase the wettability of the AMT solution on the substrate. By observing the morphology of the printed films, the ink formulas for screen printing were selected. We found the annealing process could help remove PVA. Through characterization of electrochromic performance, it was found that the best performing device had 42.57% modulation and 93.25 cm²·C⁻¹ coloration efficiency (CE) for 600 nm light. This study showed great potential in the preparation of WO₃ electrochromic devices by a low-cost screen-printing method.

【 授权许可】

Unknown