Fabisiak Kazimierz, Łoś Szymon, Paprocki Kazimierz, Szybowicz Mirosław, Winiecki Janusz, Dychalska Anna
Institute of Physics, Kazimierz Wielki University, Powstańców Wielkopolskich 2, 85090 Bydgoszcz, Poland.
Faculty of Materials Engineering and Technical Physics, Poznań University of Technology, Piotrowo 3, 60965 Poznań, Poland.
Materials (Basel). 2020 Nov 29;13(23):5446. doi: 10.3390/ma13235446.
Point defects, impurities, and defect-impurity complexes in diamond microcrystals were studied with the cathodoluminescence (CL) spectroscopy in the scanning electron microscope, photoluminescence (PL), and Raman spectroscopy (RS). Such defects can influence the directions that microcrystals are grown. Micro-diamonds were obtained by a hot-filament chemical vapor deposition (HF CVD) technique from the methane-hydrogen gas mixture. The CL spectra of diamond microcrystals taken from (100) and (111) crystallographic planes were compared to the CL spectrum of a (100) oriented Element Six diamond monocrystal. The following color centers were identified: 2.52, 2.156, 2.055 eV attributed to a nitrogen-vacancy complex and a violet-emitting center (A-band) observed at 2.82 eV associated with dislocation line defects, whose atomic structure is still under discussion. The Raman studies showed that the planes (111) are more defective in comparison to (100) planes. What is reflected in the CL spectra as (111) shows a strong band in the UV region (2.815 eV) which is not observed in the case of the (100) plane.
利用扫描电子显微镜中的阴极发光（CL）光谱、光致发光（PL）和拉曼光谱（RS）对金刚石微晶中的点缺陷、杂质以及缺陷 - 杂质复合体进行了研究。此类缺陷会影响微晶的生长方向。通过热丝化学气相沉积（HF CVD）技术，由甲烷 - 氢气混合气体制备出微金刚石。将取自（100）和（111）晶面的金刚石微晶的CL光谱与（100）取向的Element Six金刚石单晶的CL光谱进行了比较。识别出了以下色心：2.52、2.156、2.055电子伏特，它们归因于氮 - 空位复合体，以及在2.82电子伏特处观察到的与位错线缺陷相关的紫色发射中心（A带），其原子结构仍在讨论之中。拉曼研究表明，与（100）平面相比，（111）平面的缺陷更多。这在CL光谱中表现为（111）在紫外区域（2.815电子伏特）有一个强峰，而（100）平面则未观察到该峰。
