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Title: p-TlGaSeS/n-BN heterojunction as a microwave filter and as a photovoltaic device
Authors: A. F Qasrawi
ahmad omar
ala’ m. azamtta
nizami m. gasanly
Keywords: BN
microwave filters
p–n junctions
Issue Date: 2014
Publisher: Physica Status Solidi A: Applications and Materials Science
Abstract: In this work, a p–n junction made of p-type TlGaSeS and n-type boron nitride (BN) is investigated and characterized. The bilayer was studied by means of capacitance–voltage characteristics, current–voltage characteristics and Bode signal and photovoltaic effect diagnostics. It was observed that the p- TlGaSeS/n-BN bilayer exhibits negative capacitance values in the frequency range of 30–80 MHz. For an ac signal of 30 MHz, the built-in voltage and density of noncompensating carriers for the device are found to 1.06 eV and 1.72_x0001_1012 cm_x0002_3, respectively. The characteristic Bode curve analysis indicated that the bilayer behaves as a lowpass microwave filter that blocks all signals of frequencies larger than 1.28 GHz. The time constant for this device is 124 ps. In addition, the p-TlGaSeS/ n-BN junction exhibited a well-pronounced photovoltaic effect. The device showed switching properties from low to high-current injection at a particular switching voltage. The switching voltage is sensitive to the light energy and intensity. It decreased systematically with increasing light intensity and energy. The device responsivity is _x0003_7.64mAW_x0002_1. The filtering and photovoltaic properties of the device suggest its use as an optoelectronic switch and as a microwave filter being suitable for multipurpose operations.
Appears in Collections:Faculty & Staff Scientific Research publications

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