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Transparent In/SeO2 Thin Film Transistors Designed for Gigahertz/Terahertz Technologies

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Abstract

Herein, thin films of selenium oxide are coated onto transparent indium substrates with thickness of 150 nm under vacuum pressure of 10–5 mbar. In/SeO2 optical receivers are structurally, optically and electrically characterized. Induced crystallization of tetragonal SeO2 showing homogeneous composition and continuous film formation is achieved via indium substrates. Indium thin films enhance the light absorbability and optical conductivity without altering the energy band gap of SeO2. Strong interaction between In and Se at the ultrathin interface of In/SeO2 led to the formation of a new second band gap of 0.92 eV relating to direct allowed transitions in InSe. Indium substrates increased the dielectric constant of SeO2 by more than four times, making SeO2 suitable for nonlinear optical applications. The terahertz cutoff frequency changed in the range of 0.9–14.0 THz. In-depth analysis of the optical conduction in In/SeO2 films showed that the films display drift mobility, plasmon frequency and free carrier density values that render In/SeO2 a suitable candidate for fabrication of thin film transistors. The transistors displayed microwave resonator features presented by double band stop filters. The filters showed return loss values larger than 20 dB and voltage standing wave ratios of 1.0 at 1.16 GHz. A negative capacitance effect is also observed for the transistors under study.

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Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgments

This project was funded by the Deanship of Scientific Research (DSR), Arab American University, Palestine, and by the DSR of Istinye University, Istanbul, Turkey. The authors, therefore, gratefully acknowledge the DSR for technical and financial support.

Funding

This study was funded by the Deanship of Scientific Research (DSR) of Arab American University, Palestine, and by Istinye university, Istanbul, TR.

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Authors and Affiliations

  1. Department of Physics, Arab American University, Jenin, Palestine

    A. F. Qasrawi & Rana B. Daragme

  2. Department of Electrical and Electronics Engineering, Istinye University, 34010, Istanbul, Turkey

    A. F. Qasrawi

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  1. A. F. Qasrawi
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Correspondence to A. F. Qasrawi.

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Qasrawi, A.F., Daragme, R.B. Transparent In/SeO2 Thin Film Transistors Designed for Gigahertz/Terahertz Technologies. J. Electron. Mater. 51, 5617–5626 (2022). https://doi.org/10.1007/s11664-022-09834-x

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