scholarly journals High-performance near-infrared photodetectors based on gate-controlled graphene–germanium Schottky junction with split active junction

Nanophotonics ◽  
2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Cihyun Kim ◽  
Tae Jin Yoo ◽  
Min Gyu Kwon ◽  
Kyoung Eun Chang ◽  
Hyeon Jun Hwang ◽  
...  
Keyword(s):  
Dark Current ◽  
Interfacial Layer ◽  
High Performance ◽  
Near Infrared ◽  
Infrared Detection ◽  
Schottky Junction ◽  
Internal Electric Field ◽  
Detection Capability ◽  
Junction Device ◽  
Highly Sensitive

Abstract The structure of a gate-controlled graphene/germanium hybrid photodetector was optimized by splitting the active region to achieve highly sensitive infrared detection capability. The strengthened internal electric field in the split active junctions enabled efficient collection of photocarriers, resulting in a responsivity of 2.02 A W−1 and a specific detectivity of 5.28 × 1010 Jones with reduced dark current and improved external quantum efficiency; these results are more than doubled compared with the responsivity of 0.85 A W−1 and detectivity of 1.69 × 1010 Jones for a single active junction device. The responsivity of the optimized structure is 1.7, 2.7, and 39 times higher than that of previously reported graphene/Ge with Al2O3 interfacial layer, gate-controlled graphene/Ge, and simple graphene/Ge heterostructure photodetectors, respectively.

scholarly journals Highly responsive near-infrared photodetector with low dark current using graphene/germanium Schottky junction with Al2O3 interfacial layer

Nanophotonics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 1573-1579
Author(s):  
Cihyun Kim ◽  
Tae Jin Yoo ◽  
Kyoung Eun Chang ◽  
Min Gyu Kwon ◽  
Hyeon Jun Hwang ◽  
...  
Keyword(s):  
Dark Current ◽  
Interfacial Layer ◽  
Near Infrared ◽  
Schottky Junction ◽  
Infrared Photodetector ◽  
Current Ratio ◽  
Specific Detectivity

Abstract The performance of a graphene/Ge Schottky junction near-infrared photodetector is significantly enhanced by inserting a thin Al2O3 interfacial layer between graphene and Ge. Dark current is reduced by two orders of magnitudes, and the specific detectivity is improved to 1.9 × 1010 cm ⋅ Hz1/2W−1. The responsivity is improved to 1.2 AW−1 with an interfacial layer from 0.5 AW−1 of the reference devices. The normalized photo-to-dark current ratio is improved to 4.3 × 107 W−1 at a wavelength of 1550 nm, which is 10–100 times higher than those of other Ge photodetectors.

High-performance WO3−x-WSe2/SiO2/n-Si heterojunction near-infrared photodetector via a homo-doping strategy

2018 ◽  
Vol 6 (21) ◽  
pp. 5821-5829 ◽  
Author(s):  
Tianchao Guo ◽  
Cuicui Ling ◽  
Teng Zhang ◽  
Hui Li ◽  
Xiaofang Li ◽  
...  
Keyword(s):  
Barrier Height ◽  
Dark Current ◽  
High Performance ◽  
Near Infrared ◽  
Infrared Photodetector ◽  
Interface Barrier

The enhanced performance of WO3−x-WSe2/SiO2/n-Si can be mainly attributed to the down-shift of the EF of WO3−x-WSe2, which results in a larger interface barrier height and a greatly reduced dark current.

scholarly journals Functionalization of Carbon Nanomaterials for Biomedical Applications

2019 ◽  
Vol 5 (4) ◽  
pp. 72 ◽  
Author(s):  
Liu ◽  
Speranza
Keyword(s):  
Protein Delivery ◽  
Carbon Nanostructures ◽  
Biomedical Applications ◽  
High Performance ◽  
Near Infrared ◽  
Carbon Nanomaterials ◽  
Chemical Species ◽  
Infrared Region ◽  
Highly Sensitive ◽  
Versatile Tool

Over the past decade, carbon nanostructures (CNSs) have been widely used in a variety of biomedical applications. Examples are the use of CNSs for drug and protein delivery or in tools to locally dispense nucleic acids to fight tumor affections. CNSs were successfully utilized in diagnostics and in noninvasive and highly sensitive imaging devices thanks to their optical properties in the near infrared region. However, biomedical applications require a complete biocompatibility to avoid adverse reactions of the immune system and CNSs potentials for biodegradability. Water is one of the main constituents of the living matter. Unfortunately, one of the disadvantages of CNSs is their poor solubility. Surface functionalization of CNSs is commonly utilized as an efficient solution to both tune the surface wettability of CNSs and impart biocompatible properties. Grafting functional groups onto the CNSs surface consists in bonding the desired chemical species on the carbon nanoparticles via wet or dry processes leading to the formation of a stable interaction. This latter may be of different nature as the van Der Waals, the electrostatic or the covalent, the π-π interaction, the hydrogen bond etc. depending on the process and on the functional molecule at play. Grafting is utilized for multiple purposes including bonding mimetic agents such as polyethylene glycol, drug/protein adsorption, attaching nanostructures to increase the CNSs opacity to selected wavelengths or provide magnetic properties. This makes the CNSs a very versatile tool for a broad selection of applications as medicinal biochips, new high-performance platforms for magnetic resonance (MR), photothermal therapy, molecular imaging, tissue engineering, and neuroscience. The scope of this work is to highlight up-to-date using of the functionalized carbon materials such as graphene, carbon fibers, carbon nanotubes, fullerene and nanodiamonds in biomedical applications.

Transparent photodetectors with ultra-low dark current and high photoresponse for near-infrared detection

2021 ◽  
Vol 99 ◽  
pp. 106356
Author(s):  
Marvin Yonathan Hadiyanto ◽  
Richie Estrada ◽  
Chih-Chien Lee ◽  
Sajal Biring ◽  
Abdul Khalik Akbar ◽  
...  
Keyword(s):  
Dark Current ◽  
Near Infrared ◽  
Infrared Detection

Hybrid nano-scale Au with ITO structure for a high-performance near-infrared silicon-based photodetector with ultralow dark current

2020 ◽  
Vol 8 (11) ◽  
pp. 1662
Author(s):  
Xinxin Li ◽  
Zhen Deng ◽  
Jun Li ◽  
Yangfeng Li ◽  
Linbao Guo ◽  
...  
Keyword(s):  
Dark Current ◽  
High Performance ◽  
Near Infrared ◽  
Nano Scale ◽  
Silicon Based

Enhanced performance of a graphene/GaAs self-driven near-infrared photodetector with upconversion nanoparticles

Nanoscale ◽  
2018 ◽  
Vol 10 (17) ◽  
pp. 8023-8030 ◽  
Author(s):  
Jianghong Wu ◽  
Zhenwei Yang ◽  
Caiyu Qiu ◽  
Yuejiao Zhang ◽  
Zhiqian Wu ◽  
...  
Keyword(s):  
High Performance ◽  
Near Infrared ◽  
Schottky Junction ◽  
Upconversion Nanoparticles ◽  
Infrared Photodetector

A high performance near-infrared photodetector is achieved by the graphene/GaAs Schottky junction which can be further improved by coating NaYF4:Yb3+/Er3+ nanoparticles.

scholarly journals Research progress of near-infrared fluorescence immunoassay

2019 ◽  
pp. 001-007
Author(s):  
Ma Ai Jin
Keyword(s):  
Rapid Detection ◽  
Near Infrared ◽  
Infrared Detection ◽  
Research Progress ◽  
Recent Improvement ◽  
Basic Principles ◽  
Detection Technology ◽  
Food Borne ◽  
Highly Sensitive ◽  
Application Potential

Near-infrared fl uorescence immunoassay has been widely studied in the bio analytical fi eld. This review mainly introduces the basic principles of near-infrared spectroscopy and near-infrared detection technology, and summarizes the properties, characteristics and recent improvement of optical properties and signal intensity of three near-infrared fl uorescence probes (i.e. organic fl uorophores, quantum dots and rare earth compounds). We describe the applications of near-infrared fl uorescence technology in immunoassay, and prospect the application potential of lateral fl ow assay (LFA) based on this probe in the rapid detection of pathogens. Our team intends to establish a new platform which has highly sensitive near-infrared fl uorescence probes (NIFPs) combined with portable and simple immunochromatographic test strips (ICTSs) for rapid detection of food borne viruses. This will provide technical support for a rapid detection on the port.

Mitigating Dark Current for High-Performance Near-Infrared Organic Photodiodes via Charge Blocking and Defect Passivation

2021 ◽  
Vol 13 (14) ◽  
pp. 16766-16774
Author(s):  
Weitao Yang ◽  
Weiming Qiu ◽  
Epimitheas Georgitzikis ◽  
Eddy Simoen ◽  
Jill Serron ◽  
...  
Keyword(s):  
Dark Current ◽  
High Performance ◽  
Near Infrared ◽  
Defect Passivation
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