论文标题
纳米晶体钻石膜的结构，拉曼和光致发光研究：原料中氨的影响
Structural, Raman and photoluminescence studies on nanocrystalline diamond films: Effects of ammonia in feedstock
论文作者
论文摘要
在本文中，我们报告了最佳N掺杂纳米晶钻（NCD）膜的结构质量和增强光致发光（PL）发射的增强。纯和N掺杂的纳米晶钻膜是通过使用NH3：CH4：H2在不同的名义N/C比率下通过热丝化学蒸气沉积在Si上合成的。原料中的0、0.13、0.35、0.50和0.75。 X射线衍射分析揭示了系统的初始增加，然后在原料中使用N/C比的结晶石大小减小。此外，拉曼线宽度和钻石带的峰位置的单调增加表明，钻石晶格中的压缩应变随着N/C比的函数的增加，最高为0.50。但是，在较高的N/C比为0.75时，压缩应变会稍微放松一点，并产生较低的应变。此外，观察到在1195 cm-1处的独特拉曼模式，对应于C = N-H振动，表明NCD膜中的N浓度显着。此外，可见和紫外线PL研究揭示了几个相关的颜色中心的存在，其多个发射线在380至700 nm的范围内。原料中N/C比为0.35生长的最佳N掺杂钻石膜显示出约505和700 nm的室温PL发射的显着增强。该PL增强分别归因于H3和N相关缺陷中心的其他聚集体，分别在355和532 nm激光激发下。
Herein, we report on the improvement of structural quality and enhancement of photoluminescence (PL) emission for an optimally N doped nanocrystalline diamond (NCD) film. Pure and N doped nanocrystalline diamond films are synthesized on Si by hot filament chemical vapour deposition using NH3:CH4:H2 at different nominal N/C ratios viz. 0, 0.13, 0.35, 0.50 and 0.75 in feedstock. X ray diffraction analysis reveal a systematic initial increase and then a decrease in crystallite size with N/C ratio in feedstock. Further, a monotonic increase in Raman line width and peak position of diamond band indicates that the compressive strain in diamond lattice increases as a function of N/C ratio upto 0.50. However, at higher N/C ratio of 0.75, the compressive strain gets relaxed a little and produces a lower strain. Furthermore, a unique Raman mode at 1195 cm-1 is observed corresponding to the C=N-H vibrations indicating a significant N concentration in the NCD films. In addition, visible and UV PL studies reveal the presence of several N related color centres with multiple emission lines in the range of 380 to 700 nm. An optimally N doped diamond film grown at N/C ratio of 0.35 in feedstock shows a significant enhancement in room temperature PL emission at about 505 and 700 nm. This PL enhancement is attributed to H3 and other aggregates of N related defect centres, under 355 and 532 nm laser excitations respectively.
