Investigation of the effects of GaAs substrate orientations on the electrical properties of sulfonated polyaniline based heterostructures

Jameel, Dler Adil; Marroquin, John Fredy Ricardo; Aziz, Mohsin; Al Saqri, Noor Alhuda; Jum'h, Inshad; Telfah, Ahmad; Henini, Mohamed; Felix, Jorlandio Francisco

Abstract

In this work we present a detailed study of the influence of the GaAs substrate orientation on the electrical properties of heterojunctions based on GaAs and sulfonated polyaniline (SPAN) using Current-Voltage (I-V), Capacitance-Voltage (C-V), Deep-Level Transient Spectroscopy (DLTS) and Laplace DLTS techniques. Three different GaAs substrate orientations have been investigated, namely (1 0 0), (3 1 1)A and (3 1 1)B. The I-V results revealed that the turn-on voltage (Von) of SPAN/(3 1 1)B GaAs heterojunction is higher than that for SPAN/(1 0 0) GaAs and SPAN/(3 1 1)A GaAs heterojunctions. The DLTS results showed that the number of electrically active defects present in devices based on the lower index (1 0 0) plane of GaAs substrate is higher than those of higher index (3 1 1)A and (3 1 1)B GaAs substrates, corroborating with I-V results. In order to investigate the role of interface states, capacitance-frequency measurements were performed in forward bias on all three devices.

Citation

Jameel, D. A., Marroquin, J. F. R., Aziz, M., Al Saqri, N. A., Jum'h, I., Telfah, A., Henini, M., & Felix, J. F. (2020). Investigation of the effects of GaAs substrate orientations on the electrical properties of sulfonated polyaniline based heterostructures. Applied Surface Science, 504, Article 144315. https://doi.org/10.1016/j.apsusc.2019.144315

• Journal Article Type: Article
• Acceptance Date: Oct 6, 2019
• Online Publication Date: Oct 23, 2019
• Publication Date: Feb 28, 2020
• Deposit Date: Oct 7, 2019
• Publicly Available Date: Oct 24, 2020
• Journal: Applied Surface Science
• Print ISSN: 0169-4332
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 504
• Article Number: 144315
• DOI: https://doi.org/10.1016/j.apsusc.2019.144315
• Keywords: Surfaces, Coatings and Films
• Public URL: https://nottingham-repository.worktribe.com/output/2772666
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0169433219331319
• Additional Information: This article is maintained by: Elsevier; Article Title: Investigation of the effects of GaAs substrate orientations on the electrical properties of sulfonated polyaniline based heterostructures; Journal Title: Applied Surface Science; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.apsusc.2019.144315; Content Type: article; Copyright: © 2019 Elsevier B.V. All rights reserved.
• Contract Date: Oct 8, 2019