Journal of Physical Studies 23(3), Article 3701 [5 pages] (2019)
DOI: https://doi.org/10.30970/jps.23.3701
THE IMPACT OF INTRINSIC CONDUCTIVITY ON THE MECHANISMS OF TENSORESISTANCE OF UNIAXIALLY DEFORMED n-Ge SINGLE CRYSTALS
S. V. Luniov
Lutsk National Technical University,
75, L'vivska St., Lutsk, UA-43018, Ukraine
luniovser@ukr.net
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The tensoresistance for the $n$-Ge single crystals uniaxially deformed along the crystallographic direction [100] in the region of intrinsic conductivity is investigated. Measurements were conducted for $n$-Ge samples, alloyed by Sb impurity, $N_{\rm Sb}=5\cdot 10^{14}$ cm$^{-3}$ concentration.
The dependence of tensoresistance at temperatures $T<330$ K has three characteristic regions. For the first region (at $P<0.8$ GPa), the resistivity of $n$-Ge does not depend on the uniaxial pressure, since at such pressures there is a lack of the deforming redistribution of electrons between the $L_1$ and $\Delta_1$ minima. For uniaxial pressures from 0.8 to 2 GPa (second region), the growth of the resistivity of $n$-Ge is explained by the decrease of an effective electron mobility due to the redistribution of electrons between the $L_1$ and $\Delta_1$ minima with different mobility. A sharp decrease of the resistivity of $n$-Ge at uniaxial pressures $P>2$ GPa (third region) is associated with an increase in the concentration of intrinsic carriers.
The reduction of the resistivity of the investigated samples of germanium at temperatures $T> 330$ K is explained by the growth of the intrinsic carrier concentration of current. The features of the $n$-Ge tensoresistance and the non-linear growth of the electron concentration for such single crystals in the range of uniaxial pressures from 0.8 to 2.4 GPa are explained by the two-band mechanism of intrinsic conduction. The conduction band of germanium under such pressures becomes ($L_1-\Delta_1$)-type. A sharp decrease in the resistivity of $n$-Ge at uniaxial pressures $P> 2.4$ GPa is associated with an increase in the magnitude of the baric coefficient of the variation of the width of the band gap at the expense of ($L_1-\Delta_1$)-type inversion of the absolute minimum in germanium. The obtained results are important in the interpretation of various kinetic effects observed in highly deformed germanium single crystals and germanium-based nanostructures. Therefore, the results can be used for the creation of high-pressure sensors, heterostructures of SiGe, quantum dots of germanium.
PACS number(s): 72.20.Fr, 72.10.-d
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