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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Cu3AsS4 by Materials Project

Cu3AsS4 is Lavarevi\'{c}ite structured and crystallizes in the cubic P-43m space group. The structure is three-dimensional. Cu1+ is bonded to four equivalent S2- atoms to form CuS4 tetrahedra that share corners with four equivalent AsS4 tetrahedra and corners with eight equivalent CuS4 tetrahedra. All Cu–S bond lengths are 2.28 Å. As5+ is bonded to four equivalent S2- atoms to form AsS4 tetrahedra that share corners with twelve equivalent CuS4 tetrahedra. All As–S bond lengths are 2.35 Å. S2- is bonded to three equivalent Cu1+ and one As5+ atom to form corner-sharing SCu3As tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cu3AsS4 by Materials Project

Cu3AsS4 is Enargite structured and crystallizes in the orthorhombic Pmn2_1 space group. The structure is three-dimensional. there are two inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded to four S2- atoms to form CuS4 tetrahedra that share corners with four equivalent AsS4 tetrahedra and corners with eight equivalent CuS4 tetrahedra. There are two shorter (2.30 Å) and two longer (2.32 Å) Cu–S bond lengths. In the second Cu1+ site, Cu1+ is bonded to four S2- atoms to form CuS4 tetrahedra that share corners with four equivalent AsS4 tetrahedra and corners with eight CuS4 tetrahedra. There are a spread of Cu–S bond distances ranging from 2.28–2.30 Å. As5+ is bonded to four S2- atoms to form AsS4 tetrahedra that share corners with twelve CuS4 tetrahedra. There are a spread of As–S bond distances ranging from 2.27–2.29 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded to three Cu1+ and one As5+ atom to form corner-sharing SCu3As tetrahedra. In the second S2- site, S2- is bonded to three Cu1+ and one As5+ atom to form corner-sharing SCu3As tetrahedra. In the third S2- site, S2- is bonded to three Cu1+ and one As5+ atom to form corner-sharing SCu3As tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Optoelectronic Characterization of Emerging Solar Absorber Cu3AsS4

Enargite Cu 3 AsS 4 is a promising absorber for thin-film solar cells but little is known about its optoelectronic properties. Here, we present photoluminescence (PL) spectroscopy, time-resolved terahertz spectroscopy (TRTS), timeresolved photoluminescence (TRPL) spectroscopy, and cyclic voltammetry (CV) measurements of enargite thin films. The results indicate promising defect characteristics with minority carrier lifetimes on the order of ns, and band alignments suggest that buffer layers besides CdS must be developed to achieve high efficiency Cu 3 AsS 4 solar cells.

14 SOLAR ENERGY↗