室温下石墨烯的霍尔效应实验研究

摘要

The grapheme samples were deposited on glass substrates by chemical vapor deposition (CVD). Both the length and width of graphene samples were 1. 23 cm, and the thickness was 3 atomic layer thickness setting scales. The Hall effects at room temperature of the samples were studied. There was good ohmic contact between the sample and the electrode. By using van der Pauw method, the Hall voltage of the samples were measured under the magnetic field strength 0. 353 T and different electric currents. The calculating results show that the graphene Hall coefficient RH is 7.00 x 10-7 m3/C, the carrier concentration n is 10.52 x 1024/m3 and the Hall element production sensitivity KH is 6. 87 x 102 m2/C.%对用化学气相沉积法(CVD)研制的长、宽均为1.23 cm,厚度为3个原子层尺寸的石墨烯样品,进行了室温下的霍尔效应相关研究.实验中电极与石墨烯之间有良好的欧姆接触.通过范德堡法测量了样品在磁场强度为0.353 T,不同电流强度下的霍尔电压,并对结果进行处理分析,得到石墨烯的霍尔系数RH =7.00×10-7 m3/C、载流子浓度n=10.52×1024/m3、霍尔元件乘积灵敏度KH =6.87×102 m2/C.