Heating rate effects on the TL characteristics of hot filament CVD diamond film

Abstract

The thermoluminescence (TL) glow curve of polycrystalline chemically vapor deposited (CVD) diamond is strongly dependent on the heating rate used. In the present work, we report results about the heating rate effects on a 500 mm hot filament (HF) CVD diamond film grown on silicon substrate using a precursor gas mixture composition of CH 4 (5 sccm)-CO(10 sccm)-H 2 (400 sccm). The irradiations were performed with 60 Co source. The TL measurements were carried out at different heating rates in the 2-30 K/s range. As the heating rate increases, the maximum TL peak intensity decreases and shifts to higher temperature. The shift was from 578 to 669 K for heating rates of 2 and 30 K/s, respectively. The kinetics parameter and its dependence on the heating rate were evaluated using the Chen's peak shape method and a computerized glow curve deconvolution (CGCD) method.

A novel fitting method for evaluating the thermal quenching parameters of TL with an application to undoped CVD diamond

“…The increase of the peak maximum should be accompanied by the narrowing of the peak in such manner that the total peak area remains constant 1. There are a number of TL phosphors (and CVD diamond among of them 2–5), for which the peak area decreases with the increase of the heating rate β . Gorbics et al 6, 7 were the first who studied TL in six dosimetry phosphors by varying the heating rate and found that the measured TL decreased for higher heating rates.…”