High-quality II-VI films grown on amorphous substrates using tunable tetradymite templates

作者：Stoica, V. A.^*; Endicott, L.; Shen, H. H.; Liu, W.; Sun, K.; Uher, C.; Clarke, R.

来源：Applied Physics Letters, 2014, 105(22): 221606.

DOI：10.1063/1.4903268

• INSULATOR BI2TE3 FILMS
• THIN-FILMS
• TOPOLOGICAL INSULATORS
• TRANSPORT-PROPERTIES
• SB2TE3
• SURFACE
• BI2SE3
• SI

We demonstrate the growth of highly oriented CdSe and ZnTe films at similar to 300 degrees 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 similar to 1.74 eV for optimized CdSe films, the same as in a single crystal reference. An in-plane carrier diffusion length of similar to 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.

• 出版日期2014-12-1
• 单位电子科技大学