Abstract
A highly optical performance photoelectrochromic device (PECD) is assembled and investigated. The device consists of an electrochromic (EC) polymer film, a ruthenium-based dye-sensitized TiO2 electrode and a layer of Br−/Br3− electrolyte. The optical modulation of device is 44.3% at 582nm, which is much higher than device based on commonly used I−/I3− electrolyte. Its switching times between colored and bleached states are fast under illumination (100mWcm−2), 2.5s for coloring process and 2.6s for bleaching process. Also, this PECD reveals a robust cyclic durability of photoelectrochromic performance over 1000 cycles. These may indicate that Br−/Br3− electrolyte is beneficial for collaboration of photovoltaic and electrochromic parts. The results not only provide a method to assemble high performance PECD, but also disclose its potential for commercialization.
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