苯炔银修饰二硫化钼的制备及其光电器件研究

发布时间：2018-02-16 10:54

本文关键词： 二硫化钼炔基金属化合物配合物表面修饰钙钛矿太阳能电池　出处：《哈尔滨工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：二硫化钼(MoS_2)是类似于碳材料的一种硫化物,最早人们用它作为汽车的润滑剂,这和石墨的性质类似。近几年由于新型材料石墨烯的出现,引起了人们对二维材料的关注与研究。研究表明当MoS_2由块体变成二维单层时,虽然带隙由1.29 eV变成了1.8 eV,但是带隙类型却由间接变成了直接带隙。单层的MoS_2由于其特殊的电子结构,具有优异的磁学、电学和光学性质,可以广泛的用在各个领域。但是,由于MoS_2的化学惰性和不溶于一般常见溶剂,这就在很大程度上限制了它的应用,于是研究人员就开始通过物理和化学修饰来改变MoS_2的物理和化学性质。物理修饰主要是MoS_2和一些碳材料(比如石墨烯,碳纳米管等)的复合,还有一些是有机物(比如氨基酸)的表面吸附;化学修饰主要是MoS_2中的S原子和其他的原子形成稳定的化学键,然后研究修饰后MoS_2的性质。本课题采用水热法来合成MoS_2,然后通过SEM、XRD和拉曼对合成的MoS_2进行表征,分析合成MoS_2的表面形貌和成分。实验中选用含有炔基的有机金属化合物对MoS_2进行表面修饰,用硝酸银和苯乙炔、4-乙炔基苯甲酸甲酯和2-苯基-3-丁炔-2-醇来制备苯炔银、4-乙炔基苯甲酸甲银和2-苯基-3-丁炔-2-醇银。先用溶液法将制备的MoS_2在超声机中超声分离成片层,等超声完成后和含炔基的有机金属银化合物反应,反应后通过一系列的表征方法对反应后的产物进行分析,通过实验和分析发现,苯乙炔银的表面修饰效果最好。由于课题要解决MoS_2的溶解性问题,故在反应中采用不同的溶剂来进行MoS_2和苯乙炔银的反应,实验结果发现当溶剂为N,N-二甲基甲酰胺(DMF)时,重新分散的效果更好。确定了溶剂后,对反应中MoS_2和苯乙炔银反应的物质量的比进行研究,实验中设置了中MoS_2和苯乙炔银的物质量比分别为1:1,1:1.5,1:2,通过分析实验结果发现,当MoS_2和苯乙炔银的比为1:1.5时,表面修饰的效果最佳。实验对修饰好的MoS_2进行了应用,将制得的MoS_2-PAS与聚(3,4-乙烯二氧噻吩)-聚苯烯磺酸(PEDOT:PSS)复合,用作钙钛矿太阳能电池的空穴传输层,由于MoS_2-PAS是一个新材料,它的应用还处于探索阶段,可能效果不是很明显。
[Abstract]:Molybdenum disulfide (MoS _ 2) is a kind of sulfide similar to carbon material, which was first used as a lubricant for automobiles, which is similar to the properties of graphite. The results show that when MoS_2 is changed from block to monolayer, Although the band gap has changed from 1.29 EV to 1.8 EV, the band gap type has changed from indirect to direct band gap. Because of its special electronic structure, the monolayer MoS_2 has excellent magnetic, electrical and optical properties and can be widely used in various fields. Because MoS_2 is chemically inert and insoluble in common solvents, its application is limited to a large extent. So the researchers began to modify the physical and chemical properties of MoS_2 through physical and chemical modifications. The physical modification was mainly a combination of MoS_2 and some carbon materials, such as graphene, carbon nanotubes, etc. Some are adsorbed on the surface of organic matter (such as amino acids); the chemical modification mainly involves the formation of stable chemical bonds between S atoms and other atoms in MoS_2. Then, the properties of modified MoS_2 were studied. In this study, Mos _ 2 was synthesized by hydrothermal method, and then the synthesized MoS_2 was characterized by SEM XRD and Raman spectroscopy. The surface morphology and composition of synthesized MoS_2 were analyzed. Organometallic compounds containing alkynyl group were selected to modify the surface of MoS_2. Silver phenylacetylidene 4-acetylbenzoate and 2-phenyl-3-butyne-2-ol were prepared by using silver nitrate and phenylacetynyl 4-acetylbenzoate methyl ester and 2-phenyl-3-butyne-2-ol respectively. The MoS_2 was firstly separated into lamellar layer by solution method. After isonic reaction with organometallic silver compounds containing acetylene, the products were analyzed by a series of characterization methods. The surface modification of silver phenylacetylene is the best. Because the solubility of MoS_2 is to be solved, different solvents are used for the reaction between MoS_2 and silver phenylacetylene. The experimental results show that when the solvent is NN- dimethylformamide, The effect of redispersion was better. After determining the solvent, the mass ratio of MoS_2 and silver phenylacetylene was studied. In the experiment, the mass ratio of medium MoS_2 and silver phenylacetylene was 1: 1: 1: 1: 1. 5: 1: 2, respectively. The results of the analysis showed that the mass ratio of MoS_2 to silver phenylacetylene was 1: 1: 1: 1. When the ratio of MoS_2 to silver phenylacetylene is 1: 1.5, the effect of surface modification is the best. The modified MoS_2 is used in the experiment, and the MoS_2-PAS prepared is combined with PEDOT: PSS, which is composed of polytrioxothiophene 4-ethylenedioxythiophene and polyphenylethylenesulfonic acid (PEDOT: PSS). As the hole transport layer of perovskite solar cells, MoS_2-PAS is a new material, its application is still in the exploration stage, and the effect may not be obvious.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ136.12

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