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An Assessment of Silver Copper Sulfides for Photovoltaic Applications: Theoretical and Experimental Insights

DOI: 10.1039/C6TA03376H DOI Help

Authors: Christopher N Savory (University College London) , Alex M Ganose (University College London, Diamond Light Source) , Will Travis (University College London) , Ria S Atri (University College London) , Robert Palgrave (University College London) , David O. Scanlon (University College London; Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: J. Mater. Chem. A

State: Published (Approved)
Published: July 2016

Abstract: As the worldwide demand for energy increases, low-cost solar cells are being looked to as a solution for the future. To attain this, non-toxic earth-abundant materials are crucial, however cell efficiencies for current materials are limited in many cases. In this article, we examine the two silver copper sulfides AgCuS and Ag3CuS2 as possible solar absorbers using hybrid density functional theory, diffuse reflectance spectroscopy, XPS and Hall effect measurements. We show that both compounds demonstrate promising electronic structures and band gaps for high theoretical efficiency solar cells, based on Shockley-Queisser limits. Detailed analysis of their optical properties, however, indicates that only AgCuS should be of interest for PV applications, with a high theoretical efficiency. From this, we also calculate the band alignment of AgCuS against various buffer layers to aid in future device construction.

Subject Areas: Chemistry

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Added On: 29/07/2016 13:29

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