Process Development for High Voc CdTe Solar Cells: Phase I, Annual Technical Report, October 2005 - September 2006

    Research output: NRELSubcontract Report


    The focus of this project is the open-circuit voltage of the CdTe thin-film solar cell. CdTe continues to be one of the leading materials for large-scale cost-effective production of photovoltaics, but the efficiency of the CdTe solar cell has been stagnant for the last few years. At the manufacturing front, the CdTe technology is fast paced and moving forward with U.S.-based First Solar LLCleading the world in CdTe module production. To support the industry efforts and continue the advancement of this technology, it will be necessary to continue improvements in solar cell efficiency. A closer look at the state-of-the-art performance levels puts the three solar cell efficiency parameters of short-circuit current density (JSC), open-circuit voltage (VOC), and fill factor (FF) in the24-26 mA/cm2, 844?850 mV, and 74%-76% ranges respectively. During the late 1090s, efforts to improve cell efficiency were primarily concerned with increasing JSC, simply by using thinner CdS window layers to enhance the blue response (<510 nm) of the CdTe cell. These efforts led to underscoring the important role 'buffers' (or high-resistivity transparent films) play in CdTe cells. The use oftransparent bi-layers (low-p/high-p) as the front contact is becoming a 'standard' feature of the CdTe cell.
    Original languageAmerican English
    Number of pages26
    StatePublished - 2007

    Bibliographical note

    Work performed by University of South Florida, Tampa, Florida

    NREL Publication Number

    • NREL/SR-520-41525


    • buffers
    • cadmium telluride (CdTe) photovoltaic solar cells modules
    • conversion efficiency
    • fill factor
    • high resistivity transparent films
    • manufacturer
    • open-circuit voltages
    • performance
    • PV
    • short circuit current density
    • solar cells
    • thin films


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