Photodeposition of amorphous metal oxide films for electrochromic windows
Dr. Wei Cheng
Department of Chemistry, The University of British Columbia
About the Speaker
Dr. Wei Cheng is currently a postdoctoral research fellow in the Department of Chemistry at the University of British Columbia. He received his PhD in materials science in 2016 from the Swiss Federal Institute of Technology in Zurich (ETH Zurich). His research interests are focused on functional inorganic materials.
Electrochromic (EC) windows on the market are mainly produced by sputtering, which is a high-cost and energy-intensive technique that involves high vacuum conditions and sophisticated instrumentation. The high manufacturing cost of sputtered EC windows has prevented their widespread deployment. Here I present a cost-effective solution-based photodeposition method for accessing amorphous metal oxide films for electrochromic layers and charge-balancing counter electrode layers, enabling the fabrication of full EC devices that show state-of-the-art performance. This method uses UV irradiation to convert solution-processed metal chlorides to desired amorphous metal oxides. Importantly, this method is amenable to scalable solution deposition techniques such as spray-coating, which enables us to fabricate large-area electrochromic devices. This scalable technique also has other advantages including low temperature processing, inexpensive instrumentation, and easy operation which meet the industrial production requirements. For these reasons our photodeposition method has the potential to expedite commercial large-scale deployment of EC windows.
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