基于量子点功能化石墨烯的组成调控与性能研究

Graphene has a unique two-dimensional surface structure, good optical transmittance and excellent conductivity. It is the research focus to explore the potential application of graphene in many fields. This study was designed to prepare of functional materials of graphene based on the purification of natural graphites. CdSe1-xTex/graphene composite films were prepared to mix graphene with high carrier mobility and CdSe1-xTex quantum dots with wide spectral response features using functional PEG covalent modification. Combined with the surface of photovoltaic technology and four-probe method, quantum dots functionalized graphenes were investigated on the photoelectric properties. By adjusting the ratio of CdSe1-xTex quantum dots and graphene, the relationships between the composition of CdSe1-xTex/graphene and the dark conductivity, photoconductivity, photosensitivity of composite films were investigated to realize the photoelectric performance optimization. Based on the composition regulation and performance study of quantum dots functionalized graphene, it provides new ways to make full use of the graphite mineral resources from low additional value to high additional value, and it shows important application prospects in the photoelectric conversion of solar energy and the manufacture of photoelectric functional devices.

石墨烯具有独特的二维表面结构、良好的光学透过率和优异的导电性能，开拓石墨烯潜在光电应用是目前众多领域的研究热点。本研究旨在天然石墨提纯基础上制备石墨烯功能材料。利用石墨烯高的载流子迁移率和CdSe1-xTex量子点宽的光谱响应范围，采用功能PEG共价修饰的方法，制备CdSe1-xTex/石墨烯功能复合薄膜。结合表面光伏技术和四探针法，分析量子点功能化石墨烯的光电性能。通过调整复合薄膜中三元CdSe1-xTex量子点和石墨烯的配比，研究CdSe1-xTex/石墨烯组成与复合薄膜暗电导、光电导、光敏性的关系，实现CdSe1-xTex/石墨烯复合薄膜光电性能最优化。基于量子点功能化石墨烯的组成调控与光电性能研究，为充分利用石墨矿资源，实现石墨产品从低附加值向高附加值的转变提供新途径，在太阳能光电转换、光电功能器件的制造方面具有重要的应用前景。

石墨烯具有独特的二维表面结构、良好的光学透过率和优异的导电性能，开拓石墨烯潜在光电应用是目前众多领域的研究热点。本项目采用溶液合成法，将组成可调、带隙可控的活性量子点负载在石墨烯片层上，制备量子点/石墨烯复合材料。结合光电流测试技术与方法，分析光生载流子的产生与电荷转移过程，研究化学组成与结构、石墨烯/量子点配比、颗粒尺寸、反应时间等因素对量子点/石墨烯光电性能影响，实现量子点/石墨烯复合材料光电性能最优化。基于量子点功能化石墨烯的组成调控与光电性能研究，为充分利用石墨矿资源，实现石墨产品从低附加值向高附加值的转变提供新途径，在太阳能光电转换、光电功能器件的制造方面具有重要的应用前景。