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Phase Controlled Growth of Cd3As2 Nanowires and Their Negative Photoconductivity
- Phase Controlled Growth of Cd3As2 Nanowires and Their Negative Photoconductivity
- Park, Kidong; Jung, Minkyung; Kim, Doyeon; Bayogan, Janice Ruth; Lee, Jong Hyun; An, Sung Jin; Seo, Jungpil; Seo, Jaemin; Ahn, Jae-Pyoung; Park, Jeunghee
- DGIST Authors
- Jung, Minkyung; Seo, Jungpil
- Issue Date
- Nano Letters, 20(7), 4939-4946
- Article Type
- Author Keywords
- Cadmium arsenide; nanowires; Dirac semimetal; body centered tetragonal phase; primitive tetragonal phase; photoconductivity
- SEMIMETAL; MAGNETORESISTANCE; TRANSPORT; MOBILITY; CRYSTAL; SINGLE
- The bottom-up synthesis process often allows the growth of metastable phase nanowires instead of the thermodynamically stable phase. Herein, we synthesized Cd3As2 nanowires with a controlled three-dimensional Dirac semimetal phase using a chemical vapor transport method. Three different phases such as the body centered tetragonal (bct), and two metastable primitive tetragonal (P42/nbc and P42/nmc) phases were identified. The conversion between three phases (bct → P42/nbc → P42/nmc) was achieved by increasing the growth temperature. The growth direction is  for bct and P42/nbc and  for P42/nmc, corresponding to the same crystallographic axis. Field effect transistors and photodetector devices showed the nearly same electrical and photoelectrical properties for three phases. Differential conductance measurement confirms excellent electron mobility (2 × 104 cm2/(V s) at 10 K). Negative photoconductance was first observed, and the photoresponsivity reached 3 × 104 A/W, which is ascribed to the surface defects acting as trap sites for the photogenerated electrons. Copyright © 2020 American Chemical Society.
- American Chemical Society
- Related Researcher
Nanospm Lab(Advanced Materials Research Group)
Topological Matters; High Tc Superconductors; Low dimensional Quantum Matters
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