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Published on: May 11, 2019
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InPBi single crystals grown by molecular beam epitaxy
1State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, CAS, 865 Changning Road, Shanghai 200050, China.
Scientific Reports
|June 27, 2014
Summary
Researchers successfully synthesized InPBi single crystals, a robust infrared optoelectronic material previously thought difficult to grow. This breakthrough opens new possibilities for advanced semiconductor heterostructures.
Area of Science:
- Materials Science
- Semiconductor Physics
- Optoelectronics
Background:
- Indium phosphide bismuthide (InPBi) was theoretically predicted as a highly robust infrared optoelectronic material.
- Previous research indicated significant challenges in synthesizing InPBi beyond typical doping concentrations.
Purpose of the Study:
- To achieve the first successful synthesis of InPBi single crystals with a high bismuth (Bi) concentration.
- To characterize the structural, surface, and optical properties of the synthesized InPBi.
- To explore the potential of InPBi as a novel III-V compound for heterostructure applications.
Main Methods:
- Gas source molecular beam epitaxy (GSMBE) was employed for crystal growth.
- X-ray diffraction and microscopy techniques were used for structural and surface analysis.
- Optical absorption and photoluminescence spectroscopy were performed for optical characterization.
Main Results:
- Successful growth of InPBi single crystals with a high Bi concentration (2.4 ± 0.4%).
- High crystalline quality with 94 ± 5% of Bi atoms occupying substitutional sites.
- Measured band gap of 1.23 eV at room temperature.
- Observed strong and broad photoluminescence emission from 1.4 to 2.7 μm, deviating from current theoretical models.
Conclusions:
- InPBi is a viable and promising new material within the III-V semiconductor family.
- The synthesized InPBi thin films exhibit excellent material qualities suitable for heterostructures.
- The unexpected photoluminescence properties necessitate further theoretical investigation.
