Hybrid Device Architecture Using Plasmonic Nanoparticles, Graphene Quantum Dots, and Titanium Dioxide for UV Photodetectors
Hybrid Device Architecture Using Plasmonic Nanoparticles, Graphene Quantum Dots, and Titanium Dioxide for UV Photodetectors
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DOI：
10.1021/acsami.0c19058
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发表时间：
2021-01-05
影响因子：
9.5
通讯作者：
Lee, Jihoon
中科院分区：
文献类型：
--
作者：
Kunwar, Sundar;Pandit, Sanchaya;Lee, Jihoon
在这项工作中，纳米级器件架构被证明为蓝宝石（0001）上的紫外光探测器应用，首次将等离子体混合纳米粒子（HNP），石墨烯量子点（GQD）和氧化钛（TiO 2）。在10 V、1.64 mW/mm（2）的275 nm光照下，GQDs/TiO 2/HNPs光电探测器的光电流为1.58 × 10（-5）A，比裸TiO 2器件提高了约两个数量级。所提出的架构展示了在10 V下类似于1 × 10（-10）A的低暗电流，并且因此该器件展示了优异的光电暗电流比沿着以及大约几百毫秒的改进的上升和下降时间。器件结构的增强性能归因于局部表面等离子体共振（LSPR）诱导的热载流子以及来自等离子体HNP的散射光子的有效利用，所述等离子体HNP被光活性TiO 2层完全封装。此外，在TiO 2上添加GQD可以提供额外的光子吸收途径。所提出的GQD/TiO 2/HNP的混合架构证明了等离子体HNP、GQD和TiO 2的光子吸收和载流子转移特性的集成，用于增强的紫外（UV）光响应。基于时域有限差分法（FDTD）模拟沿着能带分析，深入研究了混合器件结构的光电流增强机制。这项工作表明了高性能紫外光探测器的混合器件架构的巨大潜力。
In this work, a nanoscale device architecture is demonstrated for a UV photodetector application on sapphire (0001), incorporating the plasmonic hybrid nanoparticles (HNPs), graphene quantum dots (GQDs), and titanium oxide (TiO2) for the first time. The hybrid GQDs/TiO2/HNPs photodetector exhibits the photocurrent of 1.58 X 10(-5) A under the 1.64 mW/mm(2) of 275 nm illumination at 10 V, which is around two order increase from the bare TiO2 device. The proposed architecture demonstrates a low dark current of similar to 1 X 10(-10) A at 10 V and thus the device demonstrates an excellent photo to dark current ratio along with the improved rise and fall time on the order of several hundred millisecond. The enhanced performance of device architecture is attributed to the efficient utilization of localized surface plasmon resonance (LSPR) induced hot carriers as well as scattered photons from the plasmonic HNPs that are fully encapsulated by the photoactive TiO2 layers. Furthermore, the addition of GQDs on the TiO2 can offer an additional photon absorption pathway. The proposed hybrid architecture of GQDs/TiO2 /HNPs demonstrates the integration of the photon absorption and carrier transfer properties of plasmonic HNPs, GQDs, and TiO2 for an enhanced ultraviolet (UV) photoresponse. The photocurrent enhancement mechanisms of the hybrid device architecture are thoroughly investigated based on the finite-difference time domain (FDTD) simulation along with the energy band analysis. This work demonstrates a great potential of the hybrid device architecture for high-performance UV photodetectors.