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Efficient Solution-Processed Small-Molecule Solar Cells with Inverted Structure

Authors

  • Aung Ko Ko Kyaw,

    1. Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93106-5090, USA
    2. Institute of Material Research and Engineering (A*STAR), Singapore 11760, Republic of Singapore
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  • Dong Hwan Wang,

    1. Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93106-5090, USA
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  • Vinay Gupta,

    Corresponding author
    1. Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93106-5090, USA
    2. Organic and hybrid solar cell group, CSIR- National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi, 110012, India
    • Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93106-5090, USA.
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  • Jie Zhang,

    1. Institute of Material Research and Engineering (A*STAR), Singapore 11760, Republic of Singapore
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  • Suresh Chand,

    1. Organic and hybrid solar cell group, CSIR- National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi, 110012, India
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  • Guillermo C. Bazan,

    1. Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93106-5090, USA
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  • Alan J. Heeger

    Corresponding author
    1. Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93106-5090, USA
    • Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93106-5090, USA.
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Abstract

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We successfully demonstrate inverted structure small-molecule (SM) solar cells with an efficiency of 7.88% using ZnO and PEIE as an interfacial layer. Modification of ZnO with a cost-effective PEIE thin layer increases the efficiency of the inverted cell as a result of reducing the work function of the cathode and suppressing the trap-assisted recombination. In addition to the high efficiency, the inverted SM solar cells are relatively stable in air compared to conventional cells.

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