Determination of the Minority Carrier Diffusion Length in Compositionally Graded Cu(In,Ga)Se2 Solar Cells Using Electron Beam Induced Current: Article no. 022104

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    Abstract

    A method is proposed and tested which allows for the accurate determination of the carrier collection efficiency and minority carrier diffusion length in Cu(In,Ga)Se-2 solar cells using energy dependent electron beam induced current. Gallium composition gradients across the film thickness introduce quasielectric fields that are found to improve collection efficiency when they are located towardthe rear of the sample. The quasielectric fields are also shown to reduce the influence of back surface recombination. The strengths and limitations of this technique are discussed and compared with external quantum efficiency measurements.
    Original languageAmerican English
    Number of pages3
    JournalApplied Physics Letters
    Volume96
    Issue number2
    DOIs
    StatePublished - 2010

    NREL Publication Number

    • NREL/JA-520-47799

    Keywords

    • carrier lifetime
    • copper compounds
    • efficiency
    • performance
    • solar cells
    • surface recombination

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