Capacitance of Organic Schottky Diodes Based on Copper Phthalocyanine (CuPc)
LI Zhong-Liang, WU Zhao-Xin, JIAO Bo, MAO Gui-Lin, HOU Xun
Key Laboratory of Photonics Technology for Information (Shaanxi Province), and Key Laboratory for Physical Electronics and Devices of the Ministry of Education, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an 710049
Capacitance of Organic Schottky Diodes Based on Copper Phthalocyanine (CuPc)
LI Zhong-Liang, WU Zhao-Xin, JIAO Bo, MAO Gui-Lin, HOU Xun
Key Laboratory of Photonics Technology for Information (Shaanxi Province), and Key Laboratory for Physical Electronics and Devices of the Ministry of Education, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an 710049
The capacitance of an organic Schottky diode based on copper phthalocyanine (CuPc) is investigated. Based on the organic small-signal equivalent model established, we calculate the reverse capacitance CMetal of the organic Schottky diode with different kinds of metal cathodes (Mg, Al, Au). It is found that the reverse capacitance of the organic Schottky diode shows behavior as C Mg >C Al >C Au at the same frequency, and according to our analysis, the reverse Schottky junction capacitance Cj is expected to have little effect on the reverse capacitance of the organic Schottky diode, and the space-charge limited current capacitance CS is considered to dominate the reverse capacitance, which limits the improvement of frequency characteristics of organic Schottky diodes.
The capacitance of an organic Schottky diode based on copper phthalocyanine (CuPc) is investigated. Based on the organic small-signal equivalent model established, we calculate the reverse capacitance CMetal of the organic Schottky diode with different kinds of metal cathodes (Mg, Al, Au). It is found that the reverse capacitance of the organic Schottky diode shows behavior as C Mg >C Al >C Au at the same frequency, and according to our analysis, the reverse Schottky junction capacitance Cj is expected to have little effect on the reverse capacitance of the organic Schottky diode, and the space-charge limited current capacitance CS is considered to dominate the reverse capacitance, which limits the improvement of frequency characteristics of organic Schottky diodes.
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2010, Vol. 27 
