热电子注入效率影响因素的仿真研究

Simulation Research on Influencing Factors of Hot Electron Injection Efficiency

以Fowler理论模型为基础,通过将热电子注入过程分为热电子的产生、传输和发射3个部分进行量化分析,仿真计算了入射光子能量、贵金属纳米颗粒尺寸、以及肖特基势垒高度3个因素对热电子注入效率的影响。仿真结果表明,入射光子能量和热电子注入效率之间存在正相关关系、半径为5 nm左右的贵金属纳米颗粒具有最佳的热电子注入效率、热电子注入效率随着肖特基势垒高度的升高而逐渐降低。仿真结果加深了热电子注入物理过程的理解,为等离子光催化剂和光电器件的设计提供了理论指导。

The hot electron injection effect plays a vital role in many research and applications involving light energy conversion,such as photoelectric catalysis and optoelectronic devices.The improvement of hot electron injection efficiency is the key to promoting device performance.The establishment of a model of the hot electron injection process and the quantitative calculation of the hot electron injection efficiency are very important for improving the efficiency of hot electron injection.On the basis of the Fowler theoretical model,the hot electron injection process was devided into three parts for quantitative analysis:hot electron generation,transmission,and emission.The effects of incident photon energy,noble metal nanoparticle size,and the Schottky barrier height on the hot electron injection efficiency were simulated and calculated.The simulation results show that there is a positive correlation between incident photon energy and hot electron injection efficiency;noble metal nanoparticles with a radius of about 5 nm have the best hot electron injection efficiency;the hot electron injection efficiency gradually decreases as the height of the Schottky barrier increases.The results of this research deepen the understanding of the physical process of hot electron injection and provide theoretical guidance for the design of plasma photocatalysts and optoelectronic devices.