光致发光
材料科学
异质结
单层
光子学
兴奋剂
光电子学
化学气相沉积
堆栈(抽象数据类型)
光谱学
量子产额
纳米技术
光学
物理
量子力学
计算机科学
荧光
程序设计语言
作者
Wenshuo Xu,Daichi Kozawa,Yingqiu Zhou,Yizhi Wang,Yuewen Sheng,Tian Jiang,Michael S. Strano,Jamie H. Warner
出处
期刊:Small
[Wiley]
日期:2019-12-18
卷期号:16 (3)
被引量:31
标识
DOI:10.1002/smll.201905985
摘要
2D semiconducting transition metal dichalcogenides (TMDs) are endowed with fascinating optical properties especially in their monolayer limit. Insulating hBN films possessing customizable thickness can act as a separation barrier to dictate the interactions between TMDs. In this work, vertical layered heterostructures (VLHs) of WS2 :hBN:WS2 are fabricated utilizing chemical vapor deposition (CVD)-grown materials, and the optical performance is evaluated through photoluminescence (PL) spectroscopy. Apart from the prohibited indirect optical transition due to the insertion of hBN spacers, the variation in the doping level of WS2 drives energy transfer to arise from the layer with lower quantum efficiency to the other layer with higher quantum efficiency, whereby the total PL yield of the heterosystem is increased and the stack exhibits a higher PL intensity compared to the sum of those in the two WS2 constituents. Such doping effects originate from the interfaces that WS2 monolayers reside on and interact with. The electron density in the WS2 is also controlled and subsequent modulation of PL in the heterostructure is demonstrated by applying back-gated voltages. Other influential factors include the strain in WS2 and temperature. Being able to tune the energy transfer in the VLHs may expand the development of photonic applications in 2D systems.
科研通智能强力驱动
Strongly Powered by AbleSci AI