Structural and frequency dependencies of a.c. and dielectric characterizations of epitaxial InSb-based heterojunctions

Abstract

In this work, heterojunction of InSb/InP was grown by liquid phase epitaxy (LPE). Surface morphology and crystalline structure of the heterojunction were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The frequency and temperature dependences of a.c. conductivity and dielectric properties of the heterojunctions were investigated in the ranges of 100 kHz-5 MHz and 298-628 K, respectively. The a.c. conductivity and its frequency exponents were interpreted in terms of correlated barrier hopping model (CBH), as the dominant conduction mechanism for charge carrier transport. The calculated activation energy, from the Arrhenius plot, was found to decrease with increasing frequency. Experimental results of both dielectric constant ε 1 and dielectric loss ε 2 showed a remarkable dependence of both frequency and temperature.

Detailed investigation of the structural and electrical properties of ZnO/Fe3O4 nanocomposites

“…In addition, as the temperature rises, the frequency shifts to a high value [49,54]. Space charge and Maxwell-Wagner interfacial polarization are the causes of the frequency deviates in e¢ [55,56], which agrees with the Koops phenomenological hypothesis [57]. This is a common occurrence for zinc oxide [58,59].…”

“…The magnetite concentration dependence of M max for ZnO/xFe 3 O 4 illustrates an increase of M max as Fe 3 O 4 increases up to x = 0.07 and then declines, as clear in table 2. A similar trend was reported in previous literatures [56,63,69]. The Fourier transform of a relaxation function f(t) can be used to represent the electric modulus (M * ) (t) [40,65,81].…”

Structural and dielectric properties of prepared PbS and PbTe nanomaterials

“…Furthermore, ε' increases with increasing temperature and decreases drastically with frequency increase up to a certain frequency f t , after which it becomes constant. The frequency f t shifts to a high value with increasing temperature [32,34] . The increase of the dielectric constant ε' with a frequency decrease can be attributed to electrode polarization and space charge effects [35][36][37] .…”

Dielectric relaxation and current conduction mechanism of Tb and Mn codoped bismuth ferrite grafted poly (vinyl alcohol) nanocomposite film

“…For the mutual movement of dipoles and charges, an electric relaxation arises. The dielectric relaxation behaviour is the result of the combination of two polarisation mechanisms (interfacial polarisation and space charge polarisation) that depend on the physical movement of the charges responsible for the dipoles and on the length of time required for the displacement [25].…”