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Computationally Driven Discovery of Layered Quinary Oxychalcogenides: Potential p-Type Transparent Conductors?

preprint
revised on 05.04.2019 and posted on 05.04.2019 by Benjamin Williamson, Gregory Limburn, Graeme W. Watson, Geoffrey Hyett, David Scanlon

n-Type transparent conductors (TCs) are key materials in the modern optoelectronics industry. Despite years of research, the development of a high performance p-type TC has lagged far behind that of its n-type counterparts delaying the advent of “transparent electronics” based on fully transparent p-n junctions. Here, we propose the layered oxysulfide [Cu2S2][Sr3Sc2O5] as a structural motif for discovering novel p-type TCs. We have used density functional theory to screen the thermodynamic and dynamical stability and electronic structure of 24 compositions based on this motif, predicting 2 new p-type TCs and 8 other stable systems with semiconductor properties. Following our predictions, we have successfully synthesized our best candidate p-type TC, [Cu2S2][Ba3Sc2O5], which displays structural and optical properties that validate our computational models. It is expected that the design principles emanating from this analysis will move the field closer to the realization of a high figure-of-merit p-type TC.

Funding

European Research Council Grant 758345, EPSRC (EP/N01572X/1), EPSRC (EP/L000202), Diamond I11 Rapid Access Beamtime (EE16644)

History

Email Address of Submitting Author

benjamin.williamson.10@ucl.ac.uk

Institution

University College London

Country

United Kingdom

ORCID For Submitting Author

0000-0002-6242-1121

Declaration of Conflict of Interest

None

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