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Polymorphic Ga2S3 nanowires: phase-controlled growth and crystal structure calculations
Kidong Park1, Doyeon Kim1, Tekalign Terfa Debela2
1Department of Advanced Materials Chemistry, Korea University Sejong 339-700 Republic of Korea parkjh@korea.ac.kr.
Nanoscale Advances
|September 22, 2022
Summary
Gallium sulfide (Ga2S3) nanowires exhibit unique phase transitions from monoclinic to hexagonal, wurtzite, and zinc blende structures with decreasing temperature. These nanostructures show potential for high-performance photodetector devices.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Nanostructure polymorphism is critical for advanced nanodevices.
- Gallium sulfide (Ga2S3) is a promising material for electronic applications.
Purpose of the Study:
- To synthesize and characterize Ga2S3 nanowires (NWs) with controlled phase transitions.
- To investigate the relationship between growth temperature and resulting crystal phases.
- To explore the potential of these NWs in photodetector applications.
Main Methods:
- Chemical vapor deposition (CVD) for Ga2S3 NW synthesis.
- Temperature-controlled growth to induce phase transitions.
- Transmission electron microscopy (TEM) for structural analysis.
- Density functional theory (DFT) for phase stability calculations.
Main Results:
- Ga2S3 NWs demonstrated consecutive phase transitions: monoclinic (M) → hexagonal (H) → wurtzite (W) → zinc blende (C) as temperature decreased from 850 to 600 °C.
- Hexagonal phases exhibited 1.8 nm superlattice structures due to ordered Ga sites.
- Novel core-shell structures were observed, illustrating phase evolution.
- DFT calculations supported the observed successive phase transitions.
- p-type M and H phase Ga2S3 NWs showed excellent UV photoresponse.
Conclusions:
- Controlled synthesis of Ga2S3 NWs allows for tuning of polymorphic phases.
- The observed phase transitions and resulting structures are thermodynamically supported.
- Ga2S3 NWs are suitable for developing high-performance UV photodetectors.
