石墨烯基超晶格材料的超长波长光探测研究

To enlarge the wavelength range of photodetector to mid-infrared or even higher range is important for communications or military affairs. In the current project, we choose graphene-transition metal dichalcogenides superlattice as the investigate subject, design universal synthetic routes for the controllable synthesis of ultrathin graphene. Various method will be applied to comfirm the microstructure and the electronic structure of the superlattice. The superlattice will be applied in photodetectors, the influencing factors of the photodetector such as wavelength、intensity、frequency rate of the detected light, as well as the thickness of the superlattice and the voltage of the gate will be studied. Different substrate and treatment method will be compared for optimization of the photodetector.In addition, the relationship of the special band structure of the superlattice and the process of the excitation of electron-hole under light illumination and the photocurrent gain mechanism will be invested, these results will help to give a model of the physical processes. The current project will take advantage of and strengthen the theoretical basis and experience of the proposer on material science, solid state physics and chemistry and optics science, and realize the construction of super-long wavelength photodetector.

扩大光探测器件的有效探测波长范围到中红外甚至更长波段对提高通讯及军事水平有重要意义。本项目拟以石墨烯-过渡金属硫化物超晶格材料为研究对象，设计基于材料结构特点的普适性超薄石墨烯-过渡金属硫化物超晶格的合成方法，研究确定超晶格材料的微观原子结构及电子结构。将石墨烯-过渡金属硫化物薄膜制备成光探测器件，聚焦其光探测行为相关参数的规律，如被探测光波长、强度、频率、薄膜材料厚度及门电压变化情况等与光响应率的关系。研究不同基底材料及基底材料处理方法对光探测性能的影响，对光探测性能进行优化。探索光照射下超晶格材料的特殊能带结构与光致电子-空穴分离过程、光电流增益过程之间的关系，从理论上构建超晶格材料光探测微观物理过程模型。本项目的实施将充分发挥和强化申请人在材料学、固体物理与化学及光学等交叉领域中的研究特色和优势，可望实现具有基于超薄石墨烯-过渡金属硫属化合物超晶格材料的超长波长光探测器的构筑。

本项目执行过程中合成了石墨烯-ZnO超晶格材料应用于拉曼纳米激光中，首次获得了可以调谐的室温无阈值拉曼纳米激光，该成果发表于Advanced Materials。合成碳管-二硫化钼复合材料，研究了其在近红外光探测器件方面的应用，尚需进一步寻找新的材料和新的探测方法拓展其在中远红外光探测方面的应用，相关工作尚待发表。合成沟槽状VOOH纳米片在锂离子电池方面的应用，成果发表于Materials letters上。