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    Nano-scale origins of recombination activity and optical properties of extended defects in mc-Si wafers and PV cells

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    Nano-scale origins of recombination ...
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    Author
    Guthrey, Harvey L.
    Advisor
    Gorman, Brian P.
    Date issued
    2013
    Keywords
    solar cell
    silicon photovoltaics
    extended defects
    characterization
    Silicon
    Photovoltaic cells
    Luminescence
    Electron beams
    
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    URI
    https://hdl.handle.net/11124/78713
    Abstract
    Multicrystalline silicon (mc-Si) is the most used absorber in photovoltaic (PV) cells at present. If efficiencies are to improve in this established technology a better understanding of how minority carrier lifetimes are reduced is necessary. The capture of minority carriers by states associated with extended defects is known to play a major role in reducing minority carrier lifetimes. Energy levels introduced into the silicon bandgap often have electrical activity or optical signatures that can provide clues as to the structural or chemical origin of a particular level. This work utilizes electron beam induced current (EBIC), cathodoluminescence (CL) imaging and spectroscopy, photoluminescence (PL) imaging, and nano-scale chemical analysis to provide new insight into the origin of the electrical and optical properties of extended defects in mc-Si wafers and PV cells. A new interpretation of the temperature dependence of EBIC contrast is formulated based on observations of an anomalous form of the contrast vs. temperature curves as well as evidence of high impurity content. In addition an attempt is made to determine the origin of specific types of defect related emission as well as how this emission is influenced by processing steps applied to mc-Si wafers. Nano-scale chemical analysis is used to reveal the origin of the observed luminescence.
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