大尺寸二硒化鎢薄膜的CVD法可控制備及其光學性質研究
[Abstract]:In recent years, with the discovery of graphene, a variety of graphene two-dimensional materials have become a hot topic, of which monolayer transition metal sulfide (TMDCs) has attracted the most attention. Monolayer TMDC materials, such as MoS2,MoSe2,WSe2 and WS2, are direct band-gap semiconductor materials, which make up the defect that graphene band gap is zero. Monolayer WSe2 has excellent optoelectronic properties, and its direct bandgap width of 1.65 eV can be used as most of the requirements of electronic and optoelectronic devices. Monolayer WSe2 is one of the few TMDCs materials with both p-type and n-type conductive properties. This makes it possible to make single-layer complementary logic circuits. The high quality and large scale preparation of two-dimensional materials is an essential prerequisite for the fabrication of large-scale devices. Chemical vapor deposition (CVD) is one of the most important methods for the preparation of two-dimensional materials, and it is the most promising way to achieve mass production in industry. However, so far, how to prepare large scale and high quality WSe2 thin films by CVD is still a problem to be solved. Therefore, it is of great significance to study the optimal growth conditions and growth mechanism of WSe2 thin films by CVD method. In this paper, the controllable preparation of large size tungsten diselenide thin films under atmospheric pressure CVD method is studied. The effects of growth temperature, amount of precursor tungsten source and the distance between tungsten source and substrate on the growth of WSe2 thin films are discussed. By adjusting these factors, the maximum size of 50 渭 m monolayer WSe2 triangular films, 150 渭 m hexagonal monolayer WSe2 thin films and 0.5 cm 脳 0.5 cm continuous WSe2 thin films were prepared on SiO2/Si substrates. Single layer WSe2 thin films were characterized by optical microscope, Raman spectroscopy, scanning electron microscope (SEM) and atomic force microscope (AFM). The results show that the surface morphology of monolayer WSe2 films is good and the size is large. The height measured by AFM is about 0.9 nm.. By optical microscope and Raman spectroscopy, the WSe2 films of the same sample were identified as order layer, double layer and three layers. On this basis, the photoluminescence (PL) spectra of monolayer, bilayer and three-layer WSe2 thin films are studied, and the energy band structure of tungsten diselenide from bulk material to monolayer is analyzed.
【學位授予單位】:蘭州大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:O484
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