摘要
提出基于金属薄膜-分布式布拉格反射器微腔效应增强单层二硫化钨光吸收的多层薄膜结构。运用光学传输矩阵理论研究了其输运特性,发现由于金属薄膜-分布式布拉格反射器的微腔效应,在间隔层和覆盖层之间形成电场强度极大值,有效促进入射光与单层二硫化钨的相互作用。综合优化金属层、间隔层和覆盖层厚度,单层二硫化钨在612 nm处的光吸收提高了38倍,达到78.42%。进一步探讨了光入射角、分布式布拉格反射器周期、间隔层折射率与单层二硫化钨光吸收的关系。研究结果表明,上述结构参数的变化可有效调控单层二硫化钨的吸收峰值。研究结果为制备高性能单层二硫化钨光电探测器等新型光电子器件提供了新思路。
A multi-layer thin films structure based on the microcavity effect of metal thin film-distributed Bragg reflector(DBR)to enhance light absorption of monolayer tungsten disulfide(WS 2)was proposed.Its optical transport characteristics was studied by optical transfer matrix theory.It is found that the microcavity effect of the metal thin film-DBR forms the maximum value of the electric field strength between the cover layer and spacer layer,which effectively promotes the interaction between incident light and the monolayer WS 2.As the thickness of the metal layer,spacer layer and cover layer are comprehensively optimized,the light absorption of monolayer WS 2 at 612 nm increases by 38 times,up to 78.42%.Furthermore,the influenced of light incident angle,period of the DBR and the refractive index of space layer on the light absorption of monolayer WS 2 were discussed.The research results show that changing of the above structural parameters can effectively regulate the absorption peak value of monolayer WS 2.The research results provide new ideas for the preparation of high-performance monolayer WS 2 photodetectors and other new optoelectronic devices.
作者
罗国平
陈星源
胡素梅
朱伟玲
LUO Guoping;CHEN Xingyuan;HU Sumei;ZHU Weiling(College of Science,Guangdong University of Petrochemical Technology,Maoming 525000,China)
出处
《人工晶体学报》
EI
CAS
北大核心
2020年第9期1653-1659,共7页
Journal of Synthetic Crystals
基金
广东省教育厅青年创新人才(680067)
茂名市科技计划(2017309,mm2017000007)
广东石油化工学院科研基金(2017rc20)。
关键词
单层二硫化钨
薄膜
光吸收
微腔效应
光电探测器
monolayer tungsten disulfide
thin film
light absorption
microcavity effect
photodetector
