Related Experiment Video
Updated: Feb 21, 2026
06:44
Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
Published on: June 9, 2023
3.9K
Compositional tuning in sputter-grown highly-oriented Bi-Te films and their optical and electronic structures
Yuta Saito1, Paul Fons, Kotaro Makino
1Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan. yuta-saito@aist.go.jp.
Nanoscale
|October 4, 2017
Summary
Bismuth-telluride (Bi-Te) films were grown using helicon-wave magnetron sputtering, achieving tunable compositions. These films exhibit topological insulating properties, paving the way for advanced electronics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Bismuth-telluride (Bi-Te) based materials are crucial for thermoelectric and topological electronic applications.
- Controlling film composition is essential for tuning their electronic properties.
- Helicon-wave magnetron sputtering offers a potential method for scalable thin-film deposition.
Purpose of the Study:
- To systematically explore the growth of Bi-Te films using helicon-wave magnetron sputtering with alloy targets.
- To investigate the influence of sputtering parameters on film composition and structure.
- To characterize the electronic properties and atomic structure of the grown Bi-Te films.
Main Methods:
- Helicon-wave magnetron sputtering utilizing Bi2Te3 and Te-rich Bi30Te70 alloy targets.
- Systematic variation of sputtering power and antenna-coil power to control film composition.
- High-resolution transmission electron microscopy (HRTEM) for atomic-level structural analysis.
- Band structure simulations and optical measurements for electronic property characterization.
Main Results:
- Achieved tunable film compositions ranging from Bi55Te45 to Bi43Te57 using a Bi2Te3 target, and Bi42Te58 to Bi40Te60 using a Te-rich target.
- All deposited films exhibited strong orientation of van der Waals layers parallel to the substrate.
- Direct observation of atomic stacking of Bi2Te3 quintuple and Bi bi-layers via HRTEM.
- Band structure simulations and optical measurements confirmed a zero band gap for Bi-rich Bi4Te3, indicating semimetallic behavior with a Dirac cone.
Conclusions:
- Helicon-wave magnetron sputtering enables controlled growth of Bi-Te films with tunable compositions.
- The films possess desirable structural and electronic properties, including topological insulating characteristics.
- These findings suggest significant potential for industrial-scale application in future electronics.
