کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
701384 1460820 2006 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dielectric loss and energy distribution of the shallow levels in CVD diamonds
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی برق و الکترونیک
پیش نمایش صفحه اول مقاله
Dielectric loss and energy distribution of the shallow levels in CVD diamonds
چکیده انگلیسی

The experimental data and calculations of the dielectric loss in polycrystalline CVD diamonds in the millimeter wave range and in wide temperature range of 1–300 K are analyzed. The theoretical temperature dependencies of the loss were calculated in assumption that the loss is due to the electrical conductance induced by thermal excitation of shallow levels. The continuous uniform activation energy distribution of shallow levels was assumed with additional narrow band at energies ∼ 0.001 eV and graphite-like inclusions were taken into account. A good coincidence was found for the theoretical temperature dependence with the experimental data on loss. These results correlate with the Q-DLTS continuous spectra corresponding to shallow levels obtained in the same samples. The results show the presence of acceptor shallow levels with a continuous energy spectrum and quasi-uniform activation energy distribution from ∼ 0.1 up to ∼ 0.003 eV. It is concluded that the millimeter wave losses in the CVD diamonds at the temperatures ∼ 30–300 K are mainly due to the thermal excitation of charge carriers from native shallow levels.An essential reduction (in the order of magnitude) of the dielectric loss at the edge of the CVD diamond disk after laser cutting (compared to the value in the center) was observed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Diamond and Related Materials - Volume 15, Issues 11–12, November–December 2006, Pages 1917–1920
نویسندگان
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