Investigation on defect levels in CdZnTe: Al using thermally stimulated current spectroscopy

Ruihua Nan, Wanqi Jie, Gangqiang Zha, Tao Wang, Yadong Xu, Weihua Liu

科研成果: 期刊稿件文章同行评审

16 引用 (Scopus)

摘要

Defect levels present in as-grown semi-insulating CdZnTe :Al samples, taken from the top, middle and tail of the same ingot, have been investigated by thermally stimulated current (TSC) spectroscopy. Their trap signatures, particularly the thermal activation energy, capture cross section and concentration, were characterized and discussed, respectively, by fitting the measured TSC spectra with the simultaneous multiple peak analysis method. Furthermore, the deep donor levels EDD from the top, middle and tail were found to be positioned at 0.692 ± 0.659 eV and 0.618 eV below the conduction band, respectively, by fitting the ln(I ) versus1/kT plots above room temperature. The Fermi level was positioned at 0.716 ±0.05 eV by fitting the linear plots of the temperature dependence of resistivity, which was pinned by the EDD level near the middle of the band gap, which in turn caused the observed high resistivity in the as-grown CdZnTe: Al ingot.

源语言英语
文章编号345104
期刊Journal of Physics D: Applied Physics
43
34
DOI
出版状态已出版 - 1 9月 2010

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