化学气相沉积法制备二硫化钼薄膜及电学性能表征
[Abstract]:As an important two-dimensional planar semiconductor material, molybdenum disulfide (MoS2) thin films have been widely studied for their unique physical properties. Because of its similar microstructure to graphene, ideal carrier mobility and near immunity to segment channel effect, MoS2 is widely used in many microelectronic devices, such as hydrogen storage devices. Field effect transistor (MOSFET) and photoelectric sensor have great application prospects. In this paper, MoS2 thin films with various morphologies were prepared by chemical vapor deposition (CVD), and the morphology, structure and electrical properties of the films were characterized. On this basis, MOSFET, with different layers with back gate or top gate structure was prepared and the electrical properties of MOSFET were characterized. Finally, the MoS2 based Guang Min sensor was fabricated and the device performance was tested. The main contents are as follows: (1) the preparation process of MoS2 thin films by CVD was investigated. The microstructure and crystallization quality of MoS2 thin films were characterized by optical microscope, atomic force microscope, Raman scattering spectroscopy and XRD diffraction. The effects of different parameters on the preparation of MoS2 thin films were studied. The optimum technological conditions were determined. By improving the process flow, the appearance of 3R metastable structure in MoS2 is reduced, and the crystallization quality of the films is improved effectively. (2) the monolayer or multilayer MoS2 films prepared by CVD are selected as channel materials, respectively. The field effect transistor (MOSFET),) with back gate structure was fabricated and the electrical properties of MOSFET were tested. The results show that the carrier mobility of the single-layer MoS2 channel is about 0.03 卤0.01 cm2V-1s-1, and the carrier mobility of the three-layer MoS2 channel is about 0.6 cmV-1s-1, which is larger than that of the single-layer MoS2 channel. The monolayer or multilayer MoS2 channels are N-type. MoS2 field MOSFET, with top gate structure was prepared and its electrical properties were tested. The experimental results show that the high K value dielectric layer can effectively increase the carrier mobility to 4.3 cm2V-1s-1. (3) the strip MoS2 thin films are prepared on silicon substrates with silicon dioxide by preset graphics. The transparent MoS2-based Guang Min sensor was prepared by transferring it to transparent substrate, and the performance of the sensor was tested. The light responsivity of Guang Min sensor was measured by using a yellow light source with wavelength of 580 nm. The results show that the photoresponsivity of the device to the yellow light source is about 1.92 脳 10-AW-1.
【学位授予单位】:北京有色金属研究总院
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TN304.055
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