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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment >Evidence of localised charge build-up mechanisms in CVD diamond as observed using micro-X-ray beam analysis
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Evidence of localised charge build-up mechanisms in CVD diamond as observed using micro-X-ray beam analysis

机译：使用微X射线束分析观察到的CVD金刚石中局部电荷积累机制的证据

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摘要

Geometrical non-uniformities in the photoconduction properties of polycrystalline diamond detection devices are known and can be attributed to the spatial variation of the electric field distribution in the vicinity of grain boundaries. In this study, we provided further insights into these spatial variations of the sensitivity by using a monochromatic X-ray source in order to locally create carriers in diamond under a narrow spot size with a focal point size below 1 μm in diameter. In this way, photo-sensitivity maps can be probed, and since the variation of the photon energies leads to modified penetration depths, the tool also enables the probing of the non-uniformity of the device throughout the volume of the device. Here we have also particularly focused on non-stable mechanisms that are known to affect the device performances, namely polarisation effects and charge build-up. This study therefore highlights several mechanisms that can be observed in diamond radiation detectors and that motivates their study: (ⅰ) limitations in sensitivity due to the saturation of the velocity of carriers, (ⅱ) non-uniform photo-sensitivity, (ⅲ) polarisation and (ⅳ) charge build-up.
机译：多晶金刚石检测装置的光电导特性中的几何不均匀是已知的，并且可以归因于在晶界附近的电场分布的空间变化。在这项研究中，我们通过使用单色X射线源对灵敏度的这些空间变化提供了进一步的见解，以便在焦点尺寸小于直径1μm的窄点尺寸下在钻石中局部创建载流子。以这种方式，可以探测光敏度图，并且由于光子能量的变化导致改变的穿透深度，该工具还使得能够在整个装置的体积中探测装置的不均匀性。在这里，我们还特别关注了已知会影响器件性能的不稳定机制，即极化效应和电荷积累。因此，本研究重点介绍了可以在金刚石辐射探测器中观察到的几种机制，并激发了它们的研究：（ⅰ）由于载流子速度饱和而导致的灵敏度限制；（ⅱ）不均匀的光敏性；（ⅲ）极化（ⅳ）累积电荷。

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