Analysis of Optical Enhancement in a-Si n-i-p Solar Cells Using a Detachable Back Reflector

    Research output: Contribution to conferencePaper


    We have used a novel device structure to study optical enhancement and back reflectors (BRs) in a-Si n-i-p solar cells by separating the effects of substrate texture, BR texture, and BR reflectivity. QE and diffuse and total reflection are compared for devices on smooth or textured substrates, with smooth or textured BRs. There is little improvement in J/sub SC/ for substrate haze exceeding 5%.Substrate texture is much more effective at increasing red response than the BR texture. Smooth substrates with textured BRs have comparable diffuse reflection but much higher specular reflection than textured substrates with a smooth BR. Devices on textured substrates also have lower reflection losses in the blue regions, resulting in higher QE at all wavelengths. These results apply to bothsuperstrate and substrate device configurations.
    Original languageAmerican English
    Number of pages4
    StatePublished - 1996
    EventTwenty Fifth IEEE Photovoltaic Specialists Conference - Washington, D.C.
    Duration: 13 May 199617 May 1996


    ConferenceTwenty Fifth IEEE Photovoltaic Specialists Conference
    CityWashington, D.C.

    Bibliographical note

    Work performed by the University of Delaware, Newark, Delaware and Energy Conversion Devices, Troy, Michigan

    NREL Publication Number

    • NREL/CP-22505


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