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High-Pressure Behavior and Disorder for Ag 2 ZnSnS 4 and Ag 2 CdSnS 4 .
- Source :
-
ACS omega [ACS Omega] 2021 Oct 08; Vol. 6 (41), pp. 27387-27395. Date of Electronic Publication: 2021 Oct 08 (Print Publication: 2021). - Publication Year :
- 2021
-
Abstract
- We carried out first-principles calculations to simulate Ag <subscript>2</subscript> ZnSnS <subscript>4</subscript> and Ag <subscript>2</subscript> CdSnS <subscript>4</subscript> and calculated enthalpies of different plausible structural models (kesterite-type, stannite-type, wurtzkesterite-type, wurtzstannite-type, and GeSb-type) to identify low- and high-pressure phases. For Ag <subscript>2</subscript> ZnSnS <subscript>4</subscript> , we predict the following transition: kesterite-type→[8.2GPa]→ GeSb-type. At the transition pressure, the electronic structure changes from semiconducting to metallic. For Ag <subscript>2</subscript> CdSnS <subscript>4</subscript> , we cannot decide which of the experimentally observed structures (kesterite-type or wurtzkesterite-type) is the ground-state structure because their energy difference is too small. At 4.7 GPa, however, we predict a transition to the GeSb-type structure with metallic character for both structures. Regarding the sensitivity of the material to disorder, a major drawback for solar cell applications, Ag <subscript>2</subscript> CdSnS <subscript>4</subscript> behaves similar to Cu <subscript>2</subscript> ZnSnS <subscript>4</subscript> , both showing a high tendency to cationic disorder. In contrast, the disordered structures in Ag <subscript>2</subscript> ZnSnS <subscript>4</subscript> are much higher in energy, and therefore, the material is less affected by disorder.<br />Competing Interests: The authors declare no competing financial interest.<br /> (© 2021 The Authors. Published by American Chemical Society.)
Details
- Language :
- English
- ISSN :
- 2470-1343
- Volume :
- 6
- Issue :
- 41
- Database :
- MEDLINE
- Journal :
- ACS omega
- Publication Type :
- Academic Journal
- Accession number :
- 34693159
- Full Text :
- https://doi.org/10.1021/acsomega.1c04290