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Correlation of energy disorder and open-circuit voltage in hybrid perovskite solar cells

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  • Yuchuan Shao

    (University of Nebraska-Lincoln)

  • Yongbo Yuan

    (University of Nebraska-Lincoln)

  • Jinsong Huang

    (University of Nebraska-Lincoln)

Abstract

Organometal trihalide perovskites have been demonstrated as excellent light absorbers for high-efficiency photovoltaic applications. Previous approaches to increasing the solar cell efficiency have focused on optimization of the grain morphology of perovskite thin films. Here, we show that the structural order of the electron transport layers also has a significant impact on solar cell performance. We demonstrate that the power conversion efficiency of CH3NH3PbI3 planar heterojunction photovoltaic cells increases from 17.1 to 19.4% when the energy disorder in the fullerene electron transport layer is reduced by a simple solvent annealing process. The increase in efficiency is the result of the enhancement in open-circuit voltage from 1.04 to 1.13 V without sacrificing the short-circuit current and fill factor. These results shed light on the origin of open-circuit voltage in perovskite solar cells, and provide a path to further increase their efficiency.

Suggested Citation

  • Yuchuan Shao & Yongbo Yuan & Jinsong Huang, 2016. "Correlation of energy disorder and open-circuit voltage in hybrid perovskite solar cells," Nature Energy, Nature, vol. 1(1), pages 1-6, January.
    • Handle: RePEc:nat:natene:v:1:y:2016:i:1:d:10.1038_nenergy.2015.1
    DOI: 10.1038/nenergy.2015.1
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    Cited by:

    1. Sajid, Sajid & Huang, Hao & Ji, Jun & Jiang, Haoran & Duan, Mingjun & Liu, Xin & Liu, Benyu & Li, Meicheng, 2021. "Quest for robust electron transporting materials towards efficient, hysteresis-free and stable perovskite solar cells," Renewable and Sustainable Energy Reviews, Elsevier, vol. 152(C).

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