Hopping conduction in n-type indium phosphide

“…The temperature dependence of the pre-exponential factor can be neglected only if T 0 >> T. As has been pointed out by Nagels [20], one should have to plot ln(σT For the data on n-type InP, Mansfield et al [19] deduced the values of T 0 from the plots of ln(σT) versus…”

Section: Nnh Conduction In the Impurity Bandmentioning

confidence: 98%

“…However, Mansfield [19] has pointed out that, for deducing the hopping activation energy correctly, it is necessary to include properly the temperature dependence of the pre-exponential factor σ 003 . When assuming a form of…”

Section: Nnh Conduction In the Impurity Bandmentioning

confidence: 99%

Analysis of the Hall‐effect data on Mn‐doped GaAs with taking into account the Hall factor for nearest‐neighbor hopping conduction

Kajikawa

2016

Phys. Status Solidi C

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The experimental data of the temperature‐dependent Hall‐effect measurements on Mn‐doped p ‐GaAs reported by Wolos et al. [Phys. Status Solidi C 6, 2769 (2009)], which exhibit the characteristic of nearest‐neighbor hoping (NNH) conduction, have been analyzed. For NNH conduction, it is assumed that the conductivity is expressed as σib (T) ∝︁ T−3/2 exp(−T0/T) while the Hall factor is expressed as Aib (T) ∝︁ T exp(−T0H/T), where T0 and T0H are adjustable parameters. It is found that kBT0 increases from 9 to 21 meV in proportion to the cube root of the substitutional Mn acceptor concentration, being consistent with the theory for NNH conduction. It is also found that KNNH = T0H/T0 decreases from 1.45 to 1.15 with increasing the substitutional Mn acceptor concentration from 0.8×1017 to 4×1017 cm‐3, being different from the concentration‐independent value of KNNH = 2/3 or 1/6 predicted by the theories. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…6a and c. Different hopping parameters computed from the above T 0 values did not yield rational values indicating the need for a more faithful relationship between electrical conductivity and temperature. Thus, it necessitates that the Mott's hopping is reviewed by considering the complete temperature dependence of the conductivity [16,23,24]. The expression for conductivity in such case, considering energy dependence of density of states at the Fermi energy, reduces to:…”

Section: Article In Pressmentioning

confidence: 99%