Monolithic, Self‐Powered Photovoltaic‐Electrochromic Coating for Windows

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Abstract
We report progress in the development of a monolithic, self‐powered photovoltaic‐electrochromic coating for energy‐conserving windows. The coating employs an all solid‐state electrochromic device based on Li‐doped as an optical transmittance modulator and a wide‐bandgap amorphous SiC alloy (a‐SiC:H) photovoltaic (PV) cell as an integral power source The electrochromic device is deposited together with the PV device as a monolithic coating on a glass substrate. The active Li‐ion concentration in the electrochromic device was optimized based on the thermodynamics and optical properties of the electrochromic and ion‐storage layers. Electrical and electro‐optic characteristics of the multilayer coatings are reported. The monolithic tandem PV‐electrochromic coating shows a transmittance variation of more than 60% under 1 sun illumination.

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