一氧化二氮对CVD金刚石单晶生长的影响
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摘要
近年来,大尺寸化学气相沉积(CVD)金刚石单晶的高速生长和性质研究,引起国内外众多研究者的关注,引入不同气氛高速生长CVD金刚石单晶成为其中研究热点之一。
     本论文采用微波等离子体CVD(MPCVD)方法,在H2:CH4=750sccm:90sccm的气氛条件基础上,分别引入不同形式的氮氧元素(氮气N_2,氧气O2,笑气N_2O)在高温高压法(HTHP)合成的Ib型(100)金刚石单晶籽晶上同质外延生长金刚石单晶。对样品进行显微镜、OES、Raman、PL光谱以及SEM、AFM表征,研究了氮、氧引入后对CVD金刚石单晶生长速率、生长机制以及质量、光学性能等的影响。
     在反应气氛中引入N_2O,CVD金刚石单晶的生长速率在氮、氧基团共同作用下,有较大的提高,最大速率达到135μm/h。Raman光谱和PL光谱研究表明,引入2sccm N_2O时,样品的氮含量最少、质量最好。不同N_2O流量条件下生长的金刚石单晶表面形貌变化很大。适当引入N_2O,金刚石表面刻蚀坑尺寸和数量减少,显露出典型的台阶流动生长模式。氧、氮对台阶传播的竞争作用,使得生长出形貌较好的金刚石成为可能,为CVD金刚石单晶的多次生长奠定了良好基础,有利于大尺寸单晶的合成。
     与其他气体(N_2和O2)相比,引入N_2O生长金刚石有助于提高金刚石的生长速率,同时保持良好的品质,对高速生长高品质金刚石单晶有积极作用。
Single crystal diamond attracted many researchers’ attention because of itsexcellent properties. However, limited by their size, doping and cost, natural andhigh-pressure high-temperature (HPHT) diamonds are unsuitable for applications.Single crystal diamond synthesized by MPCVD technique becomes the mostpromising method.
     In this work, nitrogen-and oxygen-related radicals was generally introduced inthe reaction atmosphere (H2:CH4=750sccm:90sccm) with different modalities(N_2,O2,N_2O) to synthesize homoepitaxy single crystal diamonds. The sampleswere tested by microscopy, optical emission spectroscopy (OES), Raman,photoluminescence (PL),SEM and AFM.
     For an appropriate addition of N_2O (at2sccm), the product presents the highestgrowth rate (135μm/h) and narrowest FWHM (2.59cm-1) of diamond Raman peak.Moreover, introducing N_2O can result in the density of the large-sized pits decrease onthe top surface of SCDs. These facts are expected to realize the long-term stabledeposition required for large crystals production. The surface roughness and color areboth in respect to the N-related content. The CVD SCDs grown with N_2O are of highquality, high growth rate, smooth surface, and/or enhanced transparency with respectto the products grown with the additions of N_2or O2. It is demonstrated that thecombined effect of N-and O-related radicals generating from N_2O in the CH4/H2plasma ambient is significant to achieve high quality and high-rate growth ofhomoepitaxial CVD SCDs.
引文
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