Effect of Trap Levels and Defect Inhomogeneities on Carrier Transport in SiC Crystals and Radiation Detectors

• Authors: V. Kažukauskas , V. Kalendra , J. Vaitkus
• Languages of publication: EN

Abstracts

EN

We present investigation of carrier transport and trapping in 4H-SiC single crystals and high-energy radiation detectors. SiC detectors were produced from bulk vanadium-compensated semi-insulating single crystal 4H-SiC and provided with nickel ohmic and titanium Schottky contacts. The prevailing defect levels were revealed by means of thermally stimulated current and thermally stimulated depolarization methods and their advanced modification - multiple heating technique. From I-V measurements a Schottky barrier height of≈1.9 eV was found. In 4H-SiC:Va the following thermal activation values were deduced: 0.18-0.19 eV, 0.20-0.22 eV, 0.3-0.32 eV, 0.33 -0.41 eV, and 0.63 eV. The maximum with activation energy of 0.33-0.41 eV appears below 125 K and most probably is caused by thermal carrier generation from defect levels. In contrast, the first three maxima with lowest activation energies, which appear at higher temperatures, are likely associated with material inhomogeneities causing potential fluctuations of the band gap. The existence of different polarization sources in different temperature ranges is also demonstrated by thermally stimulated depolarization.

Keywords

EN

72.20.Jv; 72.80.Jc; 85.30.De

Discipline

• 72.80.Jc: Other crystalline inorganic semiconductors
• 85.30.De: Semiconductor-device characterization, design, and modeling
• 72.20.Jv: Charge carriers: generation, recombination, lifetime, and trapping

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 107
• Issue: 2
• Pages: 333-339

Dates

published

2005-02

received

2004-08-22

Contributors

author

V. Kažukauskas

• Semiconductor Physics Department and Institute of Materials Science and Applied Research, Vilnius University, Saulėtekio al. 9, bldg. 3, 2040 Vilnius, Lithuania

author

V. Kalendra

• Semiconductor Physics Department and Institute of Materials Science and Applied Research, Vilnius University, Saulėtekio al. 9, bldg. 3, 2040 Vilnius, Lithuania

author

J. Vaitkus

• Semiconductor Physics Department and Institute of Materials Science and Applied Research, Vilnius University, Saulėtekio al. 9, bldg. 3, 2040 Vilnius, Lithuania

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Identifiers

DOI

10.12693/APhysPolA.107.333