Preparation Of Self-Assembled Nanostructures And Study Of Photoluminescence Mechanism And Applications

As a clean and renewable energy source,solar energy can alleviate the world’s energy shortage and environmental pollution problems.Photonic devices have a wide range of applications in fields such as communication,transportation,medicine,aviation,and military.However,the high reflectance at the interfaces of photonic devices results in low efficiency,which severely limits their development.Introducing nanostructures can increase light absorption in device through scattering and diffraction effects,thereby improving device efficiency.Based on the anti-reflection properties and principles of self-assembled nanostructures,this paper uses both experiments and simulations to apply nanostructures in photodetector and solar cell,and demonstrates that devices based on nanostructures have better efficiency than traditional devices.The main work is as follows:（1）Two types of structures,nanohole and nanopillar,were prepared by self-assembly at the air-liquid interface.The results show that applying nanopillar structures can achieve good performance in photodetectors.This study uses polystyrene（PS）nanospheres to prepare nanohole and nanopillar by a low-cost and high-quality air-liquid interface self-assembly method.The measurement results show that the minimum reflectance of the nanohole and nanopillar decreased by 95.97%and 84.83%respectively,compared to the planar type.Further research on the parameters of nanohole and nanopillar was conducted using FDTD simulation tools,and it was found that the reflectance curve has a parameter-tunable characteristic.The application of nanopillar in photodetectors was found to have better performance than the planar type through measurements of current-voltage characteristics responsivity,and quantum efficiency（Power Conversion Efficiency）.（2）The optical and electrical properties of fully patterned cone-shaped nanostructure solar cells（FPSC）were studied.The study explores the optical properties of FPSC using FDTD,and the photocurrent density(J_ph)is 41.27 m A/cm²,which is better than single-layer nanostructures,planar types.The electrical properties of FPSC were investigated using CHARGE simulation,and the doping concentration was optimized,and P-V and I-V curves were plotted.The results showed that the photoelectric conversion efficiency（PCE）of FPSC was 172.22%higher than that of the planar type.