Fast response CdS-CdS Te1−-CdTe core-shell nanobelt photodetector

Tang, Mingwei; Xu, Pengfei; Zhong, Wen; Chen, Xing; Pang, Chenlei; Xu, Xuechu; Meng, Chao; Liu, Xiaowei; Tian, He; Raghavan, Nagarajan; Yang, Qing

doi:10.1016/j.scib.2018.08.003

Cited by 24 publications

(4 citation statements)

References 41 publications

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“…Figure a shows the schematic of the NWRIM, in which a CdS NW serves as the local light source. [ 184–186 ] When the NW is pumped by a 405 nm continuous‐wave laser, the excited fluorescent light (center wavelength of ≈520 nm) could efficiently couple into the 200 nm thick TiO 2 film waveguide beneath the NW and illuminate the samples on the waveguide. Thus, scattered light can be collected by a far‐field objective, contributing subdiffraction‐limited spatial information to the final image.…”

Section: Superresolution Imaging Based On Sfs Methodsmentioning

confidence: 99%

Far‐Field Superresolution Imaging via Spatial Frequency Modulation

Tang

Liu

Zhong

et al. 2020

Laser & Photonics Reviews

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The diffraction limit substantially impedes the resolution of the conventional optical microscope. Under traditional illumination, the high-spatial-frequency light corresponding to the subwavelength information of objects is located in the near-field in the form of evanescent waves, and thus not detectable by conventional far-field objectives. Recent advances in nanomaterials and metamaterials provide new approaches to break this limitation by utilizing large-wavevector evanescent waves. Here, a comprehensive review of this emerging and fast-growing field is presented. The current superresolution imaging techniques based on evanescent-wave-assisted spatial frequency modulation, including hyperlens, microsphere lens, and evanescent field-illuminated spatial frequency shift microscopy, are illustrated. They are promising in investigating unobserved details and processes in fields such as medicine, biology, and material research. Some current challenges and future possibilities of these superresolution methods are also discussed.

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Section: Superresolution Imaging Based On Sfs Methodsmentioning

confidence: 99%

Far‐Field Superresolution Imaging via Spatial Frequency Modulation

Tang

Liu

Zhong

et al. 2020

Laser & Photonics Reviews

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“…2D material‐based photodetectors have merits such as ultrahigh photoresponsivity, broad detection range, ultrasensitive detection, and so on. [ 752–755 ] The high performance of 2D optical‐active materials for photodetection, together with their unprecedented mechanical flexibility and potential integrability with silicon technologies, make 2D materials promising candidates for next‐generation wearable optoelectronics and photonics. [ 752,756–761 ] Photoresponsivity ( R ) is the most important indicator of the performance of photodetectors.…”

Section: D Materials‐based Wearable Sensors For Human Health Applicationsmentioning

confidence: 99%

Scalably Nanomanufactured Atomically Thin Materials‐Based Wearable Health Sensors

Zhang

Jiang

2021

Small Structures

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Wearable multimodal sensors could enable the continuous, non‐invasive, precise monitoring of vital human signals critical for remote health monitoring and telemedicine. Atomically thin materials with intriguing physical characteristics, rich chemistry, and extreme sensitivity to external stimuli are attractive for implementing high‐performance wearable sensors. Despite the increased interest and efforts in 2D materials‐based wearable sensors, reducing the manufacturing and integration costs while improving the product performance remains challenging. Previous review articles provided good coverage discussing the material and device aspects of 2D materials‐based wearable devices. However, few reviews discussed the status quo, prospects, and opportunities for the scalable nanomanufacturing of 2D materials wearable sensors for health monitoring. To fill this gap, the recent advances in 2D materials‐based wearable health sensors are reviewed. The structure design, fabrication processing, the mechanisms of 2D materials‐based wearable health sensors, and their applications for human health monitoring are discussed. More significantly, a systematic discussion of the state‐of‐the‐art and technological gaps for enabling future design and nanomanufacturing of 2D materials wearable health sensors are provided. Finally, the challenges and opportunities associated with the scalable nanomanufacturing of 2D wearable health sensors are discussed.

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“…[ 14,15 ] Up to now, SnO 2 , [ 16 ] CuCrO 2 , [ 17 ] and many other materials have been applied to enhance the photoconductive performance of ZnO‐based PDs by constructing core–shell heterojunction. And PDs made of CdS core covered with inorganic semiconductors such as CdSe, [ 18 ] CdS x Te 1 − x ‐CdTe [ 19 ] have been reported. Despite numerous reports of core–shell heterojunction PDs, the heterojunction materials should be carefully selected.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photoresponse of Single GaN Microwire Ultraviolet Photodetectors by Heteroepitaxial AlN Coating Layer

Liu

Shi

Wang

et al. 2021

Adv Materials Technologies

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Core–shell heterojunction structure is a feasible approach to optimize the optoelectronic performance of devices by combining the advantages of different materials. In this work, GaN/AlN core–shell heterojunction microwire‐based photodetector (PD) has been fabricated, and appropriate epitaxy growth of AlN can improve the performances of PDs. Compared with pure GaN microwire device, the enhanced responsivity, sensitivity, detectivity, and external quantum efficiency value of 4160 A W−1, 1.88 × 107%, 3.93 × 1012 Jones, and 4.07 × 106% are obtained with 5 nm thick AlN. Meanwhile, a rise/decay time of 25/16 ms is possessed. In addition, the responsivity and detectivity are increased with an acceptable decrease in sensitivity when the exciting light intensity decreases. The effective advances of PDs are benefited from the increased Schottky barrier height, the built‐in electric field that promotes the separation of photogenerated electron‐hole pairs, and direct heteroepitaxial growth high crystal quality GaN/AlN core/shell structure, which will effectively passivate the surface of GaN microwire by covering AlN. This study sheds some light on fabricating high‐performance microwire‐based PDs.

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Fast response CdS-CdS Te1−-CdTe core-shell nanobelt photodetector

Cited by 24 publications

References 41 publications

Far‐Field Superresolution Imaging via Spatial Frequency Modulation

Far‐Field Superresolution Imaging via Spatial Frequency Modulation

Scalably Nanomanufactured Atomically Thin Materials‐Based Wearable Health Sensors

Enhanced Photoresponse of Single GaN Microwire Ultraviolet Photodetectors by Heteroepitaxial AlN Coating Layer

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