Impedance Spectroscopy of Au-CdTe:Ga Schottky Contacts

• Authors: E. Płaczek-Popko , J. Trzmiel , Z. Gumienny , E. Wojtyna , J. Szatkowski
• Languages of publication: EN

Abstracts

EN

The dielectric response of Au-CdTe gallium doped Schottky contacts was investigated by impedance spectroscopy in the frequency range from 0.2 Hz to 3 MHz, at temperatures in the range from 77 K to 300 K. Combined modulus and impedance spectroscopic plots were analyzed to study the response of the structure. The data were fitted with the simple RC circuit composed of a depletion layer capacitance in parallel with resistance and a series resistance of the bulk CdTe:Ga. The activation energy of the bulk trap obtained from the Arrhenius plot of the resistance was found to be equal to 0.08 eV, close to the value 0.09 eV obtained from the impedance-modulus spectroscopy. The trap dominant in CdTe:Ga is possibly the DX center related, as it has been observed that this is the dominant trap in the material.

Keywords

EN

81.05.Dz; 85.30.De; 84.37.+q

Discipline

• 85.30.De: Semiconductor-device characterization, design, and modeling
• 84.37.+q: Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.)
• 81.05.Dz: II-VI semiconductors

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 114
• Issue: 5
• Pages: 1279-1283

Dates

published

2008-11

received

2008-06-07

Contributors

author

E. Płaczek-Popko

• Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

author

J. Trzmiel

• Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

author

Z. Gumienny

• Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

author

E. Wojtyna

• Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

author

J. Szatkowski

• Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

References

• 1. A.K. Jonscher, Dielectric Relaxation in Solids, Chelsea Dielectric, London 1983
• 2. J. Szatkowski, E. Płaczek-Popko, K. Sierański, B. Bieg, J. Cryst. Growth 197, 684 (1999)
• 3. C.H. Park, D.J. Chadi, Phys. Rev. B 52, 11884 (1995)
• 4. E. Płaczek-Popko, Z. Gumienny, J. Trzmiel, J. Szatkowski, Opt. Appl. 38, no. 3, in press

Identifiers

DOI

10.12693/APhysPolA.114.1279