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Willis J, Claes R, Zhou Q, Giantomassi M, Rignanese GM, Hautier G, Scanlon DO. Limits to Hole Mobility and Doping in Copper Iodide. Chem Mater 2023; 35:8995-9006. [PMID: 38027540 PMCID: PMC10653089 DOI: 10.1021/acs.chemmater.3c01628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 10/09/2023] [Accepted: 10/09/2023] [Indexed: 12/01/2023]
Abstract
Over one hundred years have passed since the discovery of the p-type transparent conducting material copper iodide, predating the concept of the "electron-hole" itself. Supercentenarian status notwithstanding, little is understood about the charge transport mechanisms in CuI. Herein, a variety of modeling techniques are used to investigate the charge transport properties of CuI, and limitations to the hole mobility over experimentally achievable carrier concentrations are discussed. Poor dielectric response is responsible for extensive scattering from ionized impurities at degenerately doped carrier concentrations, while phonon scattering is found to dominate at lower carrier concentrations. A phonon-limited hole mobility of 162 cm2 V-1 s-1 is predicted at room temperature. The simulated charge transport properties for CuI are compared to existing experimental data, and the implications for future device performance are discussed. In addition to charge transport calculations, the defect chemistry of CuI is investigated with hybrid functionals, revealing that reasonably localized holes from the copper vacancy are the predominant source of charge carriers. The chalcogens S and Se are investigated as extrinsic dopants, where it is found that despite relatively low defect formation energies, they are unlikely to act as efficient electron acceptors due to the strong localization of holes and subsequent deep transition levels.
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Affiliation(s)
- Joe Willis
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
- Thomas
Young Centre, University College London, Gower Street, London WC1E 6BT, U.K.
| | - Romain Claes
- UCLouvain,
Institute of Condensed Matter and Nanosciences (IMCN), Chemin des Étoiles 8, Louvain-la-Neuve B-1348, Belgium
| | - Qi Zhou
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
- Thomas
Young Centre, University College London, Gower Street, London WC1E 6BT, U.K.
| | - Matteo Giantomassi
- UCLouvain,
Institute of Condensed Matter and Nanosciences (IMCN), Chemin des Étoiles 8, Louvain-la-Neuve B-1348, Belgium
| | - Gian-Marco Rignanese
- UCLouvain,
Institute of Condensed Matter and Nanosciences (IMCN), Chemin des Étoiles 8, Louvain-la-Neuve B-1348, Belgium
| | - Geoffroy Hautier
- UCLouvain,
Institute of Condensed Matter and Nanosciences (IMCN), Chemin des Étoiles 8, Louvain-la-Neuve B-1348, Belgium
- Thayer
School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - David O. Scanlon
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
- Thomas
Young Centre, University College London, Gower Street, London WC1E 6BT, U.K.
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K.
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