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Title: BC8 Silicon (Si-III) is a Narrow-Gap Semiconductor

Journal Article · · Physical Review Letters
 [1];  [1];  [2];  [3];  [3];  [1];  [4];  [1];  [2];  [1]
  1. Carnegie Inst. of Washington, Washington, DC (United States)
  2. Univ. of South Florida, Tampa, FL (United States)
  3. Sorbonne Univ., Paris (France)
  4. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)

Large-volume, phase-pure synthesis of BC8 silicon ($$Ia\bar{3}$$, cI16) has allowed bulk measurements of optical, electronic, and thermal properties. Unlike previous reports that conclude BC8-Si is semimetallic, we demonstrate that this phase is a direct band gap semiconductor with a very small energy gap and moderate carrier concentration and mobility at room temperature, based on far- and midinfrared optical spectroscopy, temperature-dependent electrical conductivity, Seebeck and heat capacity measurements. Samples exhibit a plasma wavelength near 11 μm, indicating potential for infrared plasmonic applications. Thermal conductivity is reduced by 1–2 orders of magnitude depending on temperature as compared with the diamond cubic (DC-Si) phase. The electronic structure and dielectric properties can be reproduced by first-principles calculations with hybrid functionals after adjusting the level of exact Hartree–Fock (HF) exchange mixing. These results clarify existing limited and controversial experimental data sets and ab initio calculations.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001057; FG02-04ER46145
OSTI ID:
1388062
Alternate ID(s):
OSTI ID: 1349707
Report Number(s):
BNL-114579-2017-JA; PRLTAO
Journal Information:
Physical Review Letters, Vol. 118, Issue 14; Related Information: EFree partners with Carnegie Institution of Washington (lead); California Institute of Technology; Colorado School of Mines; Cornell University; Lehigh University; Pennsylvania State University; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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  • Law, Stephanie; Liu, Runyu; Wasserman, Daniel
  • Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena, Vol. 32, Issue 5 https://doi.org/10.1116/1.4891170
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Cited By (4)

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The high pressure phase transformation behavior of silicon nanowires journal September 2018
Physical properties of group 14 semiconductor alloys in orthorhombic phase journal July 2019
Silicon nanowires to detect electric signals from living cells journal May 2019