Evolution of Structural and Electrical Properties of Carbon Films from Amorphous Carbon to Nanocrystalline Graphene on Quartz Glass by HFCVD
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- 所属单位：材料科学与技术学院
- 发表刊物：ACS APPLIED MATERIALS & INTERFACES
- 关键字：structural transition hot-filament chemical vapor deposition amorphous carbon nanocrystalline graphene hydrogen dilution ratio
- 摘要：Direct growth of graphene films on glass is of great importance but has so far met with limited success. The noncatalytic property of glass results in the low decomposition ability of hydrocarbon precursors, especially at reduced temperatures (<1000 degrees C), and therefore amorphous carbon (a-C) films are more likely to be obtained. Here, we report the hydrogen influence on the structural and electrical properties of carbon films deposited on quartz glass at 850 degrees C by hot filament chemical vapor deposition (HFCVD). The results revealed that the obtained a-C films were all graphitelike carbon films. Structural transition of the deposited films from a-C to nanocrystalline graphene was achieved by raising the hydrogen dilution ratios from 10 to over 80%. On the basis of systematic structural and chemical characterizations, a schematic process with three steps including sp(2) chain aggregation, aromatic ring formation, and spa bond etching was proposed to interpret the structural evolution. The nanocrystalline graphene films grown on glass by HFCVD exhibited good electrical performance with a carrier mobility of 36.76 cm(2)/(V s) and a resistivity of 5.24 x 10(-3) Omega cm over an area of 1 cm(2). Temperature-dependent electrical characterizations revealed that the electronic transport in carbon films was dominated by defect, localized, and extended states, respectively, when increasing the temperature from 75 to 292 K. The nanocrystalline graphene films presented higher carrier mobility and lower carrier concentration than those of a-C films, which was mainly attributed to their smaller conductive activation energy. The present investigation provides an effective way for direct growth of graphene films on glass at reduced temperatures and also offers useful insights into the understanding of structural and electrical relationship between a-C and graphene.
- ISSN号：1944-8244
- 是否译文：否
- 发表时间：2018-05-23
- 合写作者：翟子豪,陈洁仪
- 通讯作者：沈鸿烈
- 发表时间：2018-05-23
