Impedance Spectroscopy Analysis of SnO₂ Nanowires/Carbon Nanotubes Heterojunctions
Main Article Content
Abstract
Impedance spectroscopy is a powerful method for characterizing the electrical properties of semiconductor materials and hybrid structures based on them. In this study, the heterojunctions of SnO₂ nanowires and carbon nanotubes (CNTs) were fabricated by first growing the SnO₂ nanowires on Pt electrodes using a thermal chemical vapour deposition (CVD) method and then dip-coating solution of CNTs. The morphology and characteristics of the SnO₂/CNTs heterojunctions were characterized by a scanning electron microscopy (SEM) and Raman spectroscopy. AC impedance spectroscopy of the SnO₂/CNTs heterojunctions were investigated in the frequency range of 13 MHz to 5 Hz with an oscillating voltage of 10 mV during DC bias of ± 0.4 V at room temperature. The AC equivalent circuit model was developed to gain a deeper understanding of the heterojunctions.
Keywords
Impedance spectroscopy, heterojunctions, SnO2 nanowires, carbon nanotubes
Article Details
References
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[10] Yadav P, Pandey K, Bhatt V, Kumar M, Kim J, Critical aspects of impedance spectroscopy in silicon solar cell characterization: A review, Renew Sustain Energy Rev, 76 (2017), 1562–1578.
[11] Yim C, McEvoy N, Kim H-Y, Rezvani E, Duesberg GS, Investigating of the interfaces in Schottky diodes using equivalent circuit models, ACS Appl Mater Interfaces, 5 (2013), 6951–6958.
[12] Fattah A, Khatami S, Mayorga-Martinez CC, Medina-Snchez M, Baptista-Pires L, Merko A, Graphene/Silicon heterojunction schottky diode for vapors sensing using impedance spectroscopy, Small, 10 (2014), 4193–4199.
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