摘要
采用微波等离子体增强化学气相沉积(MPECVD)法,在涂有FeCl3的硅衬底上制备出了纳米非晶碳薄膜。通过SEM、XRD和拉曼光谱分析了薄膜材料的形貌和结构。并研究了薄膜材料的场发射特性。结果表明:薄膜的开启电场仅为0.39 V/μm;当电场强度为1.85 V/μm时,电流密度高达3.06 mA/cm2;且场发射点均匀、密集、稳定。迭代法计算表明薄膜材料的功函数为3.1 eV,发射点密度约为1.7×105个/cm2。这些均表明该薄膜是一种性能优良的场发射阴极材料。
The amorphous nano-carbon films were synthesized on the crystalline silicon by microwave plasma enhanced chemical vapor deposition（MPECVD） system.The surface morphology and the structure of the films were tested by scanning electron microscopy（SEM）,Raman scattering spectroscopy and XRD.The field emission characteristics were measured.The results showed that the turn-on field was only 0.39 V/μm,the current density of 3.06 mA/cm2 was obtained when the electric field was 1.85 V/μm,and the luminous spots were symmetrical,serried and steady.The work function of the films was calculated by an iterative method,which was only 3.1 eV.The emission sites density could reach 1.7×105 cm-2.All these results indicate that the amorphous nano-carbon films are very promising for field emission applications.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2012年第6期1768-1771,共4页
Journal of Synthetic Crystals
基金
国家自然科学基金(61076041)
教育部科学技术研究重点项目(205091)
河南省科技攻关项目(0624250014)
