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Prediction and realisation of high mobility and degenerate p-type conductivity in CaCuP thin films

Willis, Joe; Bravić, Ivona; Schnepf, Rekha R; Heinselman, Karen N; Monserrat, Bartomeu; Unold, Thomas; Zakutayev, Andriy; ... Crovetto, Andrea; + view all (2022) Prediction and realisation of high mobility and degenerate p-type conductivity in CaCuP thin films. Chemical Science , 13 pp. 5872-5883. 10.1039/d2sc01538b. Green open access

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Abstract

Phosphides are interesting candidates for hole transport materials and p-type transparent conducting applications, capable of achieving greater valence band dispersion than their oxide counterparts due to the higher lying energy and increased size of the P 3p orbital. After computational identification of the indirect-gap semiconductor CaCuP as a promising candidate, we now report reactive sputter deposition of phase-pure p-type CaCuP thin films. Their intrinsic hole concentration and hole mobility exceed 1 × 10^{20} cm^{−3} and 35 cm^{2} V^{−1} s^{−1} at room temperature, respectively. Transport calculations indicate potential for even higher mobilities. Copper vacancies are identified as the main source of conductivity, displaying markedly different behaviour compared to typical p-type transparent conductors, leading to improved electronic properties. The optical transparency of CaCuP films is lower than expected from first principles calculations of phonon-mediated indirect transitions. This discrepancy could be partly attributed to crystalline imperfections within the films, increasing the strength of indirect transitions. We determine the transparent conductor figure of merit of CaCuP films as a function of composition, revealing links between stoichiometry, crystalline quality, and opto-electronic properties. These findings provide a promising initial assessment of the viability of CaCuP as a p-type transparent contact.

Type: Article
Title: Prediction and realisation of high mobility and degenerate p-type conductivity in CaCuP thin films
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/d2sc01538b
Publisher version: https://doi.org/10.1039/D2SC01538B
Language: English
Additional information: © 2022 The Author(s). Published by the Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (http://creativecommons.org/licenses/by/3.0/).
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10148173
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