Fabrication and Electronic Properties of CZTSe
To solve the open circuit voltage limitation in Cu2ZnSn(SSe)4 further understanding of defects and the fundamental properties of the bulk material are needed. Although there are a number of literature reports of single crystals, the vast majority are made with a flux agent such as iodine which could potentially act as a dopant or affect defect properties in the material. In this report 2-5 mm single crystals of CZTSe of different compositions were achieved by solid state reaction of elements in a sealed ampoule below the melt temperature without a flux agent. The bulk composition of single crystals are compared to electronic and opto-electronic properties from Hall and photoluminescence (PL) measurements. Intergrain measurements showed record hole mobilities for pure CZTSe in excess of 100 cm2/Vs. PL intensity and uniformity were improved by removing inhomogeneities and surface phases through crystal polishing, followed by Br-methanol etching to remove polishing damage. Despite processing conditions more favorable to equilibrium crystal conditions, a broad PL peak is observed with significant luminescence below the band-gap similar to literature reports of band-tailing. A more detailed publication of results and further experiments will be reported in an upcoming Journal of Photovoltaics.
- Publication Date:
- OSTI Identifier:
- Report Number(s):
- DOE Contract Number:
- Resource Type:
- Resource Relation:
- Conference: IEEE Photovoltaics Specialists Conference, Denver, CO, June 9-13, 2014
- Research Org:
- IBM TJ Watson Research Center / University of Delaware
- Sponsoring Org:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Country of Publication:
- United States
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