Relativistic quasiparticle self-consistent electronic structure of hybrid halide perovskite photovoltaic absorbers

Federico Brivio, Keith T. Butler, Aron Walsh, Mark Van Schilfgaarde

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Abstract

Solar cells based on a light absorbing layer of the organometal halide perovskite CH3NH3PbI3 have recently surpassed 15% conversion efficiency, though how these materials work remains largely unknown. We analyze the electronic structure and optical properties within the quasiparticle self-consistent GW approximation. While this compound bears some similarity to conventional sp semiconductors, it also displays unique features. Quasiparticle self-consistency is essential for an accurate description of the band structure: Band gaps are much larger than what is predicted by the local-density approximation (LDA) or GW based on the LDA. Valence band dispersions are modified in a very unusual manner. In addition, spin-orbit coupling strongly modifies the band structure and gives rise to unconventional dispersion relations and a Dresselhaus splitting at the band edges. The average hole mass is small, which partially accounts for the long diffusion lengths observed. The surface ionization potential (work function) is calculated to be 5.7 eV with respect to the vacuum level, explaining efficient carrier transfer to TiO2 and Au electrical contacts.

Original languageEnglish
Article number155204
JournalPhysical Review B : Condensed Matter and Materials Physics
Volume89
Issue number15
DOIs
Publication statusPublished - 21 Apr 2014

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Local density approximation
Band structure
Perovskite
Electronic structure
halides
absorbers
electronic structure
Ionization potential
Valence bands
Dispersions
Conversion efficiency
Solar cells
Orbits
Energy gap
Optical properties
Vacuum
Semiconductor materials
approximation
surface ionization
diffusion length

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Relativistic quasiparticle self-consistent electronic structure of hybrid halide perovskite photovoltaic absorbers. / Brivio, Federico; Butler, Keith T.; Walsh, Aron; Van Schilfgaarde, Mark.

In: Physical Review B : Condensed Matter and Materials Physics, Vol. 89, No. 15, 155204, 21.04.2014.

Research output: Contribution to journalArticle

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