Structural diversity and electronic properties of Cu2SnX 3 (X=S, Se)

A first-principles investigation

Ying Teng Zhai, Shiyou Chen, Ji Hui Yang, Hong Jun Xiang, Xin Gao Gong, Aron Walsh, Joongoo Kang, Su Huai Wei

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

The ternary semiconductors Cu2SnX3 (X=S, Se) are found frequently as secondary phases in synthesized Cu2ZnSnS 4 and Cu2ZnSnSe4 samples, but previous reports on their crystal structures and electronic band gaps are conflicting. Here we report their structural and electronic properties as calculated using a first-principles approach. We find that (i) the diverse range of crystal structures such as the monoclinic, cubic, and tetragonal phases can all be derived from the zinc-blende structure with tetrahedral coordination. (ii) The energy stability of different structures is determined primarily by the local cation coordination around anions, which can be explained by a generalized valence octet rule. Structures with only Cu3Sn and Cu 2Sn2 clusters around the anions have low and nearly degenerate energies, which makes Cu and Sn partially disordered in the cation sublattice. (iii) The direct band gaps of the low-energy compounds Cu 2SnS3 and Cu2SnSe3 should be in the range of 0.8-0.9 and 0.4 eV, respectively, and are weakly dependent on the long-range structural order. A direct analogy is drawn with the ordered vacancy compounds found in the Cu(In,Ga)Se2 solar-cell absorbers.

Original languageEnglish
Article number075213
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number7
DOIs
Publication statusPublished - 2011 Aug 15

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Electronic properties
Anions
Cations
Energy gap
Negative ions
Crystal structure
Positive ions
electronics
anions
Vacancies
Zinc
Structural properties
cations
Solar cells
crystal structure
octets
Semiconductor materials
sublattices
energy
absorbers

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Zhai, Ying Teng ; Chen, Shiyou ; Yang, Ji Hui ; Xiang, Hong Jun ; Gong, Xin Gao ; Walsh, Aron ; Kang, Joongoo ; Wei, Su Huai. / Structural diversity and electronic properties of Cu2SnX 3 (X=S, Se) : A first-principles investigation. In: Physical Review B - Condensed Matter and Materials Physics. 2011 ; Vol. 84, No. 7.
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Structural diversity and electronic properties of Cu2SnX 3 (X=S, Se) : A first-principles investigation. / Zhai, Ying Teng; Chen, Shiyou; Yang, Ji Hui; Xiang, Hong Jun; Gong, Xin Gao; Walsh, Aron; Kang, Joongoo; Wei, Su Huai.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 84, No. 7, 075213, 15.08.2011.

Research output: Contribution to journalArticle

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