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Title: A new silicon phase with direct band gap and novel optoelectronic properties

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep14342· OSTI ID:1324969
 [1];  [2];  [3];  [4]
  1. Peking Univ., Beijing (China); Key Lab. of High Energy Density Physics Simulation, and IFSA Collaborative Innovation Center, Ministry of Education, Beijing (China)
  2. Peking Univ., Beijing (China); Key Lab. of High Energy Density Physics Simulation, and IFSA Collaborative Innovation Center, Ministry of Education, Beijing (China); Virginia Commonwealth Univ., Richmond, VA (United States)
  3. Tohoku Univ., Sendai (Japan); Kutateladze Institute of Thermophysics, Novosibirsk (Russia)
  4. Virginia Commonwealth Univ., Richmond, VA (United States)

Due to the compatibility with the well-developed Si-based semiconductor industry, there is considerable interest in developing silicon structures with direct energy band gaps for effective sunlight harvesting. In this paper, using silicon triangles as the building block, we propose a new silicon allotrope with a direct band gap of 0.61 eV, which is dynamically, thermally and mechanically stable. Symmetry group analysis further suggests that dipole transition at the direct band gap is allowed. Additionally, this new allotrope displays large carrier mobility (~104 cm/V · s) at room temperature and a low mass density (1.71 g/cm3), making it a promising material for optoelectronic applications.

Research Organization:
Virginia Commonwealth Univ., Richmond, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-96ER45579
OSTI ID:
1324969
Journal Information:
Scientific Reports, Vol. 5; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 73 works
Citation information provided by
Web of Science

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Two novel silicon phases with direct band gaps journal January 2016
The generalized maximum hardness principle revisited and applied to solids (Part 2) journal January 2017
Long-lived luminescence of silicon nanocrystals: from principles to applications journal January 2017
Six new silicon phases with direct band gaps journal January 2019
Novel silicon phases and nanostructures for solar energy conversion journal December 2016
Optical properties of lonsdaleite silicon nanowires: A promising material for optoelectronic applications journal June 2018
Physical properties of Si–Ge alloys in C 2/ m phase: a comprehensive investigation journal April 2019
A new series of two-dimensional silicon crystals with versatile electronic properties journal February 2018
Structure and infrared photoluminescence of GeSi nanocrystals formed by high temperature annealing of GeO x /SiO 2 multilayers journal August 2016
A Reinvestigation of a Superhard Tetragonal sp3 Carbon Allotrope journal June 2016
Thermal Dependence of Optical Parameters of Thin Polythiophene Films Blended with PCBM journal April 2018