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

Band alignment of the hybrid halide perovskites CH3NH3PbCl3, CH3NH3PbBr3 and CH3NH3PbI3 The most studied material has been CH3NH3PbI3 (MAPI) as it has a band gap (ca. 1.6 eV) well matched for a single-junction solar cell configuration and it is more chemically robust than the SnII analogues. MA refers to the methylammonium (CH3NH3+) cation. The optical absorption onset is blue shifted (larger band gaps) for the isostructural bromide and chloride compounds, which makes them of interest for multi-junction and semi-transparent photovoltaic applications.17 In addition, PbCl2 is commonly used as a precursor to obtain the iodide, with the presence of secondary chloride phases a possibility. The inclusion of mixed halides in hybrid perovskite absorbers has been studied from several perspectives and offers control over several important characteristics of the materials and devices. Improved carrier lifetimes are obtained with the increased crystal quality associated with the presence of Cl, possibly through partial substitution of I in the lattice,18–20 which has been attributed to reduced bi-molecular recombination rates.21 Tuning of optical absorption spectra due to band gap modification has also been reported in several studies.8,17,20,22 The analogous bromide based devices display larger open circuit voltages23 and improved device lifetimes.20 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Materials Horizons Royal Society of Chemistry

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

Butler, Keith T.; Frost, Jarvist M.; Walsh, Aron
Royal Society of Chemistry — Feb 23, 2015
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Abstract

The most studied material has been CH3NH3PbI3 (MAPI) as it has a band gap (ca. 1.6 eV) well matched for a single-junction solar cell configuration and it is more chemically robust than the SnII analogues. MA refers to the methylammonium (CH3NH3+) cation. The optical absorption onset is blue shifted (larger band gaps) for the isostructural bromide and chloride compounds, which makes them of interest for multi-junction and semi-transparent photovoltaic applications.17 In addition, PbCl2 is commonly used as a precursor to obtain the iodide, with the presence of secondary chloride phases a possibility. The inclusion of mixed halides in hybrid perovskite absorbers has been studied from several perspectives and offers control over several important characteristics of the materials and devices. Improved carrier lifetimes are obtained with the increased crystal quality associated with the presence of Cl, possibly through partial substitution of I in the lattice,18–20 which has been attributed to reduced bi-molecular recombination rates.21 Tuning of optical absorption spectra due to band gap modification has also been reported in several studies.8,17,20,22 The analogous bromide based devices display larger open circuit voltages23 and improved device lifetimes.20

Journal

Materials Horizons – Royal Society of Chemistry

Published: Feb 23, 2015

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