A Waveguide-Integrated Two-Dimensional Light-Emitting Diode Based on p-Type WSe2/n-Type CdS Nanoribbon Heterojunction
A Waveguide-Integrated Two-Dimensional Light-Emitting Diode Based on p-Type WSe2/n-Type CdS Nanoribbon Heterojunction
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基于p型WSe2/n型CdS纳米带异质结的波导集成二维发光二极管
DOI：
10.1021/acsnano.1c10607
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发表时间：
2022-03-22
期刊：
影响因子：
17.1
通讯作者：
Pan, Anlian
中科院分区：
文献类型：
--
作者：
Yang, Xin;Wu, Rong;Pan, Anlian
过渡金属二卤代化合物(TMD)已经成为构建纳米级光源的二维(2D)构件。到目前为止，已经成功展示了一系列基于TMD的发光器件(LED)。然而，它们的原子性和平面性需要额外的波导/微腔来实现有效的光路由/限制。从这个意义上说，将TMDs与具有电子活性的光子纳米结构集成在一起形成功能异质结对于减小占地面积和提高集成能力的2D光电子芯片具有至关重要的意义。在这里，我们报道了一种基于p型单层二硒化钨(WSe2)和n型硫化镉(CDS)纳米带(NR)异质结二极管的室温波导集成发光器件。混合发光二极管在正向偏置下表现出明显的整流效果，在1.65 eV处通过ML WSe2中的激子共振产生了显著的电致发光。对驱动电流的积分电致发光强度在大电流水平下呈现超线性分布，这意味着通过谷间散射促进了载流子注入。通过利用CDS NR波导，WSe2 EL可以有效地耦合并进一步布线，以实现潜在的光学互连功能。我们的结果表明，波导型LED是基于TMD的光电子电路的双重作用模块。
Transition metal dichalcogenides (TMDs) have emerged as two-dimensional (2D) building blocks to construct nanoscale light sources. To date, a wide array of TMD-based light-emitting devices (LEDs) have been successfully demonstrated. Yet, their atomically thin and planar nature entails an additional waveguide/microcavity for effective optical routing/confinement. In this sense, integration of TMDs with electronically active photonic nanostructures to form a functional heterojunction is of crucial importance for 2D optoelectronic chips with reduced footprint and higher integration capacity. Here, we report a room-temperature waveguide-integrated light-emitting device based on a p-type monolayer (ML) tungsten diselenide (WSe2) and n-type cadmium sulfide (CdS) nanoribbon (NR) heterojunction diode. The hybrid LED exhibited clear rectification under forward biasing, giving pronounced electroluminescence (EL) at 1.65 eV from exciton resonances in ML WSe2. The integrated EL intensity against the driving current shows a superlinear profile at a high current level, implying a facilitated carrier injection via intervalley scattering. By leveraging CdS NR waveguides, the WSe2 EL can be efficiently coupled and further routed for potential optical interconnect functionalities. Our results manifest the waveguided LEDs as a dual-role module for TMD-based optoelectronic circuitries.