Photoelectrochromic Devices with Enhanced Power Conversion Efficiency.

In the present work, we propose a new architecture for partly covered photoelectrochromic devices with a modified anode layout, so that the TiO film is deposited first on the substrate, covering a small part of its surface, followed by the WO film that covers the remaining device area. As a result, the TiO film can be subjected to the proper thermal and chemical treatment without affecting the electrochromic performance of the WO film. The proposed design led to photoelectrochromic (PEC) devices with a power conversion efficiency (PCE) four times higher than that of typical partly covered devices, with a measured maximum of 4.