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

doi:10.1038/nenergy.2015.1

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

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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 focussed on optimisation 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 CH ₃NH ₃PbI ₃ 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 V to 1.13 V without sacrificing the short-circuit current and fill factor. Finally, these results shed light on the origin of open-circuit voltage in perovskite solar cells, and provide a new path to further increase their efficiency

Authors:

Shao, Yuchuan ^[1]; Yuan, Yongbo ^[1]; Huang, Jinsong ^[1]

Univ. of Nebraska-Lincoln, Lincoln, NE (United States)

Publication Date:: 2016-01-11

Research Org.:: Univ. of Nebraska-Lincoln, Lincoln, NE (United States)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)

OSTI Identifier:: 1342748

Grant/Contract Number:: EE0006709

Resource Type:: Accepted Manuscript

Journal Name:: Nature Energy

Additional Journal Information:: Journal Volume: 1; Journal Issue: 1; Journal ID: ISSN 2058-7546

Publisher:: Nature Publishing Group

Country of Publication:: United States

Language:: English

Subject:: 14 SOLAR ENERGY; electronic properties and materials; electronics, photonics and device physics; solar cells

Citation Formats


                    Shao, Yuchuan, Yuan, Yongbo, and Huang, Jinsong. Correlation of energy disorder and open-circuit voltage in hybrid perovskite solar cells.  United States: N. p., 2016. 
        Web.  doi:10.1038/nenergy.2015.1.

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                    Shao, Yuchuan, Yuan, Yongbo, & Huang, Jinsong. Correlation of energy disorder and open-circuit voltage in hybrid perovskite solar cells.  United States.  doi:10.1038/nenergy.2015.1.

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                    Shao, Yuchuan, Yuan, Yongbo, and Huang, Jinsong. Mon .  
        "Correlation of energy disorder and open-circuit voltage in hybrid perovskite solar cells".  United States.  doi:10.1038/nenergy.2015.1.  https://www.osti.gov/servlets/purl/1342748.

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@article{osti_1342748,

  title        = {Correlation of energy disorder and open-circuit voltage in hybrid perovskite solar cells},

  author       = {Shao, Yuchuan and Yuan, Yongbo and Huang, Jinsong},

  abstractNote = {Organometal trihalide perovskites have been demonstrated as excellent light absorbers for high efficiency photovoltaic applications. Previous approaches to increasing the solar cell efficiency have focussed on optimisation 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 V to 1.13 V without sacrificing the short-circuit current and fill factor. Finally, these results shed light on the origin of open-circuit voltage in perovskite solar cells, and provide a new path to further increase their efficiency},

  doi          = {10.1038/nenergy.2015.1},

  journal      = {Nature Energy},

  number       = 1,

  volume       = 1,

  place        = {United States},

  year         = {2016},

  month        = {1}

}

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DOI: 10.1038/nenergy.2015.1

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