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From kesterite to stannite photovoltaics: Stability and band gaps of the Cu2(Zn,Fe)SnS4 alloy.
- Source :
-
Applied Physics Letters . 1/13/2014, Vol. 104 Issue 2, p021912-1-021912-4. 4p. 1 Diagram, 2 Charts, 4 Graphs. - Publication Year :
- 2014
-
Abstract
- Kesterite semiconductors, particularly Cu2ZnSnS4 (CZTS), have attracted attention for thin-film solar cells. We investigate the incorporation of Fe into CZTS to form the Cu2(Zn,Fe)SnS4 solid-solution for tuning the lattice spacing and band gap. First-principles calculations confirm a phase transition from kesterite (Zn-rich) to stannite (Fe-rich) at Fe/Zn∼0:4. The exothermic enthalpy of mixing is consistent with the high solubility of Fe in the lattice. There is a linear band-gap bowing for each phase, which results in a blue-shift of photo-absorption for Fe-rich alloys due to the confinement of the conduction states. We propose compositions optimal for Si tandem cells. [ABSTRACT FROM AUTHOR]
- Subjects :
- *KESTERITE
*SEMICONDUCTORS
*THIN films
*SOLAR cells
*SOLID solutions
Subjects
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 104
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 93874270
- Full Text :
- https://doi.org/10.1063/1.4862030