MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Electrical Properties and Carrier Transport Mechanism of Au/n-GaN Schottky Contact Modified Using a Copper Pthalocyanine (CuPc) Interlayer
V. JanardhanamI. JyothiJi-Hyun LeeJae-Yeon KimV. Rajagopal ReddyChel-Jong Choi
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JOURNALS FREE ACCESS Advance online publication

Article ID: M2013449

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Abstract

We investigated the electrical characteristics of Au/n-GaN Schottky rectifier incorporating a copper pthalocyanine (CuPc) interlayer using current–voltage (IV), capacitance–voltage (CV) and conductance–voltage (GV) measurements. The barrier height of the Au/CuPc/n-GaN Schottky contact was higher than that of the Au/n-GaN Schottky diode, indicating that the CuPc interlayer influenced the space charge region of the n-GaN layer. The series resistance of Au/CuPc/n-GaN Schottky contact extracted from the CV and GV methods was dependent on the frequency. In addition, the series resistance obtained from CV and GV characteristics was comparable to that from Cheung’s method at sufficiently high frequencies and in strong accumulation regions. The forward log I–log V plot of Au/CuPc/n-GaN Schottky contact exhibited four distinct regions having different slopes, indicating different conduction mechanisms in each region. In particular, at higher forward bias, the trap-filled space-charge-limited current was the dominant conduction mechanism of Au/CuPc/n-GaN Schottky contact, implying that the most of traps were occupied by injected carriers at high injection level.

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© 2014 The Japan Institute of Metals and Materials
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