Theoretical Investigation of Biaxially Tensile-Strained Germanium Nanowires.

Title Theoretical Investigation of Biaxially Tensile-Strained Germanium Nanowires.
Authors Z. Zhu; Y. Song; Q. Chen; Z. Zhang; L. Zhang; Y. Li; S. Wang
Journal Nanoscale Res Lett
DOI 10.1186/s11671-017-2243-1

We theoretically investigate highly tensile-strained Ge nanowires laterally on GaSb. Finite element method has been used to simulate the residual elastic strain in the Ge nanowire. The total energy increment including strain energy, surface energy, and edge energy before and after Ge deposition is calculated in different situations. The result indicates that the Ge nanowire on GaSb is apt to grow along ?100? rather than ?110? in the two situations and prefers to be exposed by {105} facets when deposited a small amount of Ge but to be exposed by {110} when the amount of Ge exceeds a critical value. Furthermore, the conduction band minima in ?-valley at any position in both situations exhibits lower values than those in L-valley, leading to direct bandgap transition in Ge nanowire. For the valence band, the light hole band maxima at ?-point is higher than the heavy hole band maxima at any position and even higher than the conduction band minima for the hydrostatic strain more than ?5.0%, leading to a negative bandgap. In addition, both electron and hole mobility can be enhanced by owing to the decrease of the effective mass under highly tensile strain. The results suggest that biaxially tensile-strained Ge nanowires hold promising properties in device applications.

Citation Z. Zhu; Y. Song; Q. Chen; Z. Zhang; L. Zhang; Y. Li; S. Wang.Theoretical Investigation of Biaxially Tensile-Strained Germanium Nanowires.. Nanoscale Res Lett. 2017;12(1):472. doi:10.1186/s11671-017-2243-1

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See more Germanium products. Germanium (atomic symbol: Ge, atomic number: 32) is a Block P, Group 14, Period 4 element with an atomic weight of 72.63. Germanium Bohr ModelThe number of electrons in each of germanium's shells is 2, 8, 18, 4 and its electron configuration is [Ar] 3d10 4s2 4p2. The germanium atom has a radius of 122.5 pm and a Van der Waals radius of 211 pm. Germanium was first discovered by Clemens Winkler in 1886. In its elemental form, germanium is a brittle grayish white semi-metallic element. Germanium is too reactive to be found naturally on Earth in its native state. High Purity (99.999%) Germanium (Ge) MetalIt is commercially obtained from zinc ores and certain coals. It is also found in argyrodite and germanite. It is used extensively as a semiconductor in transitors, solar cells, and optical materials. Other applications include acting an alloying agent, as a phosphor in fluorescent lamps, and as a catalyst. The name Germanium originates from the Latin word "Germania" meaning "Germany."

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