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Capacitance–Voltage Spectroscopy of Trapping States in GaN/AlGaN Heterostructure Field-Effect Transistors

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In AlGaN/GaN heterostructure field-effect transistor structures, the surface defects and dislocations may serve as trapping centers and affect the device performance via leakage current and low-frequency noise. In this paper we report results of our investigation of the trapping characteristics of SiO2-passivated Al0.2Ga0.8N/GaN heterostructure field-effect transistors using the capacitance–voltage (CV) profiling technique. From the measured frequency dependent CV data, we identified the characteristics of the traps at the AlGaN/GaN interface adjoining the channel and on the surface along the ungated region between the gate and drain. Based on the measured data, the influence of the channel traps on the low-frequency noise spectra and the effect of the surface traps on possible leakage noise are analyzed and compared with the previous studies.
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Document Type: Research Article

Publication date: August 1, 2006

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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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