High-quality II-VI films grown on amorphous substrates using tunable tetradymite templates
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
We demonstrate the growth of highly oriented CdSe and ZnTe films at ~300 °C on amorphous substrates such as glass and flexible polyimide using ultrathin tetradymite buffer layers composed of SbxBi2-xTe3 alloys lattice-matched to the film overgrowth. This leads to significant improvement of the crystallinity, roughness, grain size, and pit density of the II-VI overlayer along with enhancement of the optoelectronic properties. For example, photoluminescence emission is observed at ~1.74 eV for optimized CdSe films, the same as in a single crystal reference. An in-plane carrier diffusion length of ~500 nm is inferred from transient optical data. The use of tetradymite buffer layers to control II-VI compound deposition on non-crystalline substrates is a promising route for large area optoelectronic applications such as photovoltaic, light-emission, or infrared detector devices.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Center for Solar and Thermal Energy Conversion (CSTEC)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0000957; FG02-06ER46273; AC02-06CH11357
- OSTI ID:
- 1370084
- Alternate ID(s):
- OSTI ID: 1226576
- Journal Information:
- Applied Physics Letters, Vol. 105, Issue 22; Related Information: CSTEC partners with University of Michigan (lead); Kent State University; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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