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Title: Characterization of the Al/Ge/In2Se3/Ga2S3/Al hybrid tunneling barriers designed for Gigahertz/Terahertz applications
Authors: A. F Qasrawi
olfat a.omareya
Issue Date: 2018
Publisher: Thin Solid Films
Abstract: In the current work, we report the design and performance of a tunneling amorphous thin film hybrid device made of Ge/In2Se3/Ga2S3 sandwiched between two aluminum thin films. Each of the stacked semiconducting layers are of 200?nm thicknesses. The hybrid device which is composed of a p-n junction between two Schottky shoulders is designed to have two valence band offsets of 0.59 and 0.84?eV at the Ge/In2Se3 and at In2Se3/Ga2S3 interfaces, respectively. The offsets which caused two quantum confinements forces the device to exhibit field effect assisted thermionic and thermionic transport mechanisms under the reverse and forward biasing conditions, respectively. When an alternating current signal is imposed between the terminals of the device, the device conducted by the quantum mechanical tunneling of charge carriers and by the correlated barrier hopping above and below 0.180?GHz, respectively. The hybrid structure are also observed to exhibit series and parallel resonance at the switching frequency between the two conduction mechanisms. It also exhibited negative differential capacitance effect in the frequency domain of 0.18–1.80?GHz. For the Al/Ge/In2Se3/Ga2S3/Al hybrid structure the microwave cutoff frequency reached 100?GHz. The latter value is promising as it indicates the ability of using the device as fast switches and microwave/Tera wave traps.
Appears in Collections:Faculty & Staff Scientific Research publications

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