Synthesis of Novel Phases in Si Nanowires Using Diamond Anvil Cells at High Pressures and Temperatures
- Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Acton, Australian Capital Territory 2601,Australia
- Institute for Solid State Electronics, Vienna University of Technology, Floragasse 7, 1040 Vienna, Austria
- High Pressure Collaborative Access Team, X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
- Center for Nanophase Materials Sciences, Physical Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
Silicon has several technologically promising allotropes that are formed via high-pressure synthesis. One of these phases (hd) has been predicted to have a direct band gap under tensile strain, whereas other (r8 and bc8) phases are predicted to have narrow band gaps and good absorption across the solar spectrum. Pure volumes of these phases cannot be made using conventional nanowire growth techniques. In this work, Si nanowires were compressed up to ~20 GPa and then decompressed using a diamond anvil cell in the temperature range of 25–165 °C. It was found that at intermediate temperatures, near-phase-pure bc8-Si nanowires were produced, whereas amorphous Si (a-Si) dominated at lower temperatures, and a direct transformation to the diamond cubic phase (dc-Si) occurred at higher temperatures under compression. Thus this study has opened up a new pressure–temperature pathway for the synthesis of novel Si nanowires consisting of designed phase components with transformative properties.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Austrian Science Fund (FWF); Australian Research Council
- Grant/Contract Number:
- AC05-00OR22725; AC02-06CH11357; FG02-94ER14466; EAR-1606856; EAR-1634415; P28175-N27; DP140102331; 89233218CNA000001
- OSTI ID:
- 1765056
- Alternate ID(s):
- OSTI ID: 1764483; OSTI ID: 1765130; OSTI ID: 1765724; OSTI ID: 1774445
- Report Number(s):
- LA-UR-20-23970
- Journal Information:
- Nano Letters, Journal Name: Nano Letters Vol. 21 Journal Issue: 3; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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