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First-principles study of intrinsic defects in formamidinium lead triiodide perovskite solar cell absorber

Abstract

As an alternative to methylammonium lead triiodide (MAPbI3), formamidinium lead triiodide (FAPbI3) perovskites have recently attracted significant interest because of its higher stability and smaller band gap. Here, based on first-principles calculations, we investigate systematically the intrinsic defects in FAPbI3. While methylammonium(MA)-related defects MAI and IMA in MAPbI3 have high formation energies, we found that formamidinium(FA)-related defects VFA, FAI and IFA in FAPbI3 have much lower formation energies. Antisites FAI and IFA create deep levels in the band gap which can act as recombination centers and results in reduced carrier lifetime and low open circuit voltage in FAPbI3-based photovoltaic devices. We further demonstrate that through cation mixing of MA and FA in perovskites, the formation of these defects can be substantially suppressed.

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Publication details

The article was received on 13 Jan 2018, accepted on 09 Feb 2018 and first published on 09 Feb 2018


Article type: Communication
DOI: 10.1039/C8CP00280K
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    First-principles study of intrinsic defects in formamidinium lead triiodide perovskite solar cell absorber

    N. Liu and C. Yam, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP00280K

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