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2010•JOURNAL OF INFRARED AND MILLIMETER WAVESOpen access

ANOMALOUS CAPACITANCE OF GaN-BASED SCHOTTKY DIODES

KH Chu, WJ Zhang, JT Xu, Xiangyang Li

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Abstract

The capacitance-voltage (C-V) measurements of GaN-based Schottky diodes were carried out in the frequency range of 0.3～1.5MHz. Anomalous peaks and negative value of capacitance were observed in the C-V plots of Au/i-GaN Schottky diodes under forward bias, while neither of them was seen in the plots of Au/i-Al0.45Ga0.55N Schottky diodes. Based on the parameters extracted from the current-voltage (I-V) and C-V plots of GaN and Al0.45Ga0.55N Schottky diodes, the peak and negative capacitance are ascribed to the capture and loss of interface charges. These processes are greatly suppressed when there exists a huge series resistance in the diode.

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What this paper is about

The capacitance-voltage (C-V) measurements of GaN-based Schottky diodes were carried out in the frequency range of 0.3～1.5MHz. Anomalous peaks and negative value of capacitance were observed in the C-V plots of Au/i-GaN Schottky diodes under forward bias, while neither of them was seen in the plots of Au/i-Al0.45Ga0.55N Schottky diodes. Based on the parameters extracted from the current-voltage (I-V) and C-V plots of GaN and Al0.45Ga0.55N Schottky diodes, the peak and negative capacitance are ascribed to the capture and loss of interface charges. These processes are greatly suppressed when there exists a huge series resistance in the diode.

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Available abstract

The capacitance-voltage (C-V) measurements of GaN-based Schottky diodes were carried out in the frequency range of 0.3～1.5MHz. Anomalous peaks and negative value of capacitance were observed in the C-V plots of Au/i-GaN Schottky diodes under forward bias, while neither of them was seen in the plots of Au/i-Al0.45Ga0.55N Schottky diodes. Based on the parameters extracted from the current-voltage (I-V) and C-V plots of GaN and Al0.45Ga0.55N Schottky diodes, the peak and negative capacitance are ascribed to the capture and loss of interface charges. These processes are greatly suppressed when there exists a huge series resistance in the diode.

Key concepts: Schottky diode, Capacitance, Materials science, Optoelectronics, Diode, Equivalent series resistance, Schottky barrier, Metal–semiconductor junction

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