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Issue 2, 2015
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Band alignment of the hybrid halide perovskites CH3NH3PbCl3, CH3NH3PbBr3 and CH3NH3PbI3

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Abstract

Organic–inorganic halide perovskites efficiently convert sunlight to electricity in solar cells. The choice of halide (Cl, Br or I) can be used to chemically tune the spectral response of the materials and the positions of the valence and conduction bands (i.e. the ionisation potential and electron affinity). Here the band offsets of the methylammonium lead halides are reported, including relativistic corrections and using the Pb 1s core level as a reference state. The binding energy of the valence band decreases monotonically down the series, primarily due to the change from 3p to 4p to 5p valence orbitals of the halide. Type I band alignments are predicted, which implies that Br and Cl secondary phases in CH3NH3PbI3 thin-films would act as barriers to charge transport in photovoltaic devices.

Graphical abstract: Band alignment of the hybrid halide perovskites CH3NH3PbCl3, CH3NH3PbBr3 and CH3NH3PbI3

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Publication details

The article was received on 09 Sep 2014, accepted on 28 Oct 2014 and first published on 28 Oct 2014


Article type: Communication
DOI: 10.1039/C4MH00174E
Citation: Mater. Horiz., 2015,2, 228-231
  • Open access: Creative Commons BY license
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    Band alignment of the hybrid halide perovskites CH3NH3PbCl3, CH3NH3PbBr3 and CH3NH3PbI3

    K. T. Butler, J. M. Frost and A. Walsh, Mater. Horiz., 2015, 2, 228
    DOI: 10.1039/C4MH00174E

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