Wide-Gap a-SiC:H PV-Powered Electrochromic Window Coating

    Research output: Contribution to conferencePaper


    We report on the first monolithic, amorphous-silicon-based, photovoltaic-powered electrochromic window coating. The coating employs a wide bandgap a-Si1-xCx:H n-i-p photovoltaic (PV) cell as a semitransparent power supply, and a LiyWO3/LiAlF4/V2O5 electrochromic (EC) device as an optical-transmittance modulator. The EC device is deposited directly on top of a PV cell that coats a glass substrate.The a-Si1-xCx:H PV cell has a Tauc gap of 2.2 eV and a transmittance of 60% to 80% over a large portion of the visible light spectrum. We reduced the thickness of the device to about 600 ..Alpha.. while maintaining a 1-sun open-circuit voltage of 0.9 V and short-circuit current of 2 mA/cm 2 . Our prototype 16 cm 2 PV/EC device modulates the transmittance by more than 60% over a large portion ofthe visible spectrum. The coloring and bleaching times of the EC device are approximately 1 minute under normal operating conditions (+/- 1 volt). A brief description of photoelectrochromic windows study is also given.
    Original languageAmerican English
    Number of pages5
    StatePublished - 1998
    Event2nd World Conference on Photovoltaic Solar Energy Conversion - Vienna, Austria
    Duration: 6 Jul 199810 Jul 1998


    Conference2nd World Conference on Photovoltaic Solar Energy Conversion
    CityVienna, Austria

    NREL Publication Number

    • NREL/CP-520-23919


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