Optimization of Si NC/P3HT Hybrid Solar Cells

Authors

  • Chin-Yi Liu,

    1. Department of Mechanical Engineering University of Minnesota 111 Church St SE, Minneapolis, MN 55455 (USA)
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  • Zachary C. Holman,

    1. Department of Mechanical Engineering University of Minnesota 111 Church St SE, Minneapolis, MN 55455 (USA)
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  • Uwe R. Kortshagen

    Corresponding author
    1. Department of Mechanical Engineering University of Minnesota 111 Church St SE, Minneapolis, MN 55455 (USA)
    • Department of Mechanical Engineering University of Minnesota 111 Church St SE, Minneapolis, MN 55455 (USA).
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Abstract

Silicon nanocrystals (Si NCs) are shown to be an electron acceptor in hybrid solar cells combining Si NCs with poly(3-hexylthiophene) (P3HT). The effects of annealing and different metal electrodes on Si NC/P3HT hybrid solar cells are studied in this paper. After annealing at 150 °C, Si NC/P3HT solar cells exhibit power conversion efficiencies as high as 1.47%. The hole mobility in the P3HT phase extracted from space-charge-limited current measurements of hole-only devices increases from 2.48 × 10−10 to 1.11 × 10−9 m2 V−1 s−1 after annealing, resulting in better transport in the solar cells. A quenching of the open-circuit voltage and short-circuit current is observed when high work function metals are deposited as the cathode on Si NC/P3HT hybrid devices.

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