Advances in solution-processable near-infrared phototransistors

2019 ◽  
Vol 7 (13) ◽  
pp. 3711-3729 ◽  
Author(s):  
Ning Li ◽  
Zhaojue Lan ◽  
Linfeng Cai ◽  
Furong Zhu
Keyword(s):  
Near Infrared ◽  
Low Cost ◽  
Health And Safety ◽  
Safety Monitoring ◽  
Large Area ◽  
Promising Alternative ◽  
High Performing ◽  
Nir Light ◽  
Inorganic Semiconductor ◽  
Solution Processable

Solution processable near infrared (NIR) photodetectors provide a promising alternative due to their low cost, flexible design, adaptability to various fabrications, and large area manufacturability, removing the limitations of traditional wafer-based inorganic semiconductor techniques. High performing NIR photodetectors offer attractive options for applications in visualizing NIR light, health and safety monitoring.

scholarly journals Reshaping Hybrid Perovskites Emission with Flexible Polymer Microcavities

2020 ◽  
Vol 230 ◽  
pp. 00006
Author(s):  
Paola Lova ◽  
Paolo Giusto ◽  
Francesco Di Stasio ◽  
Giovanni Manfredi ◽  
Giuseppe M. Paternò ◽  
...  
Keyword(s):  
Thin Films ◽  
Photonic Crystals ◽  
Low Cost ◽  
Scale Production ◽  
Large Area ◽  
Light Emitting Devices ◽  
Flexible Polymer ◽  
Hybrid Perovskite ◽  
Wide Range ◽  
Solution Processable

Thanks to versatile optoelectronic properties solution processable perovskites have attracted increasing interest as active materials in photovoltaic and light emitting devices. However, the deposition of perovskite thin films necessitates wide range solvents that are incompatible with many other solution-processable media, including polymers that are usually dissolved by the perovskite solvents. In this work, we demonstrate that hybrid perovskite thin films can be coupled with all polymer planar photonic crystals with different approaches to achieve emission intensity enhancement and reshaping using different approaches. The possibility to control and modify the emission spectrum of a solution processable perovskite via a simple spun-cast polymer structure is indeed of great interest in optoelectronic applications requiring high color purity or emission directionality. Furthermore, thanks to the ease of fabrication and scalability of solution-processed photonic crystals, this approach could enable industrial scale production of low-cost, large area, lightweight and flexible polymer-perovskite lighting devices, which may be tuned without resorting to compositional engineering.

ASSESSING WORKING MEMORY IN REAL-LIFE SITUATIONS WITH FUNCTIONAL NEAR-INFRARED SPECTROSCOPY

2009 ◽  
Vol 02 (04) ◽  
pp. 423-430 ◽  
Author(s):  
TING LI ◽  
LI LI ◽  
QINGMING LUO ◽  
HUI GONG
Keyword(s):  
Working Memory ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Brain Function ◽  
Near Infrared ◽  
Low Cost ◽  
Real Life ◽  
Memory Studies ◽  
Functional Near Infrared Spectroscopy ◽  
Promising Alternative

Working memory is one of the most important functions in our brain, which has been widely studied with unreal-life measured technologies. A functional near-infrared spectroscopy (fNIRS) instrument with a portable and low-cost design is developed, which is capable of providing hemodynamic measurement associated with brain function in real-life situations. Using this instrument, we performed working memory studies involved in Chinese words encoding, verbal, and spatial stem recognition, which are mainly studied with other technologies. Our results show that fNIRS can well assess working memory activities, in comparison with the reported results mainly using other methodologies. Furthermore, we find that hemodynamic change in the prefrontal cortex during all working memory tasks is highly associated with subjects' behavioral data. fNIRS is shown to be a promising alternative to the current methodologies for studying or assessing functional brain activities in natural condition.

scholarly journals Solution-processed near-infrared Cu(In,Ga)(S,Se)2 photodetectors with enhanced chalcopyrite crystallization and bandgap grading structure via potassium incorporation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Joo-Hyun Kim ◽  
Hyemi Han ◽  
Min Kyu Kim ◽  
Jongtae Ahn ◽  
Do Kyung Hwang ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Grain Growth ◽  
Carrier Mobility ◽  
Near Infrared ◽  
Low Cost ◽  
Charge Carrier Mobility ◽  
Infrared Region ◽  
Infrared Light ◽  
Large Area ◽  
Solution Processed

AbstractAlthough solution-processed Cu(In,Ga)(S,Se)2 (CIGS) absorber layers can potentially enable the low-cost and large-area production of highly stable electronic devices, they have rarely been applied in photodetector applications. In this work, we present a near-infrared photodetector functioning at 980 nm based on solution-processed CIGS with a potassium-induced bandgap grading structure and chalcopyrite grain growth. The incorporation of potassium in the CIGS film promotes Se uptake in the bulk of the film during the chalcogenization process, resulting in a bandgap grading structure with a wide space charge region that allows improved light absorption in the near-infrared region and charge carrier separation. Also, increasing the Se penetration in the potassium-incorporated CIGS film leads to the enhancement of chalcopyrite crystalline grain growth, increasing charge carrier mobility. Under the reverse bias condition, associated with hole tunneling from the ZnO interlayer, the increasing carrier mobility of potassium-incorporated CIGS photodetector improved photosensitivity and particularly external quantum efficiency more than 100% at low light intensity. The responsivity and detectivity of the potassium-incorporated CIGS photodetector reach 1.87 A W−1 and 6.45 $$\times$$ ×  1010 Jones, respectively, and the − 3 dB bandwidth of the device extends to 10.5 kHz under 980 nm near-infrared light.

scholarly journals Large-area, low-cost near-infrared meta-surface reflector based on a pixelated two-dimensional silicon disk array

2020 ◽  
Vol 28 (25) ◽  
pp. 38355
Author(s):  
Cheng Chen ◽  
Zhao-yi Wang ◽  
Zhi-gang Zheng ◽  
Yanhua Liu ◽  
Wenbin Huang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Low Cost ◽  
Two Dimensional ◽  
Large Area ◽  
Disk Array

Graphene-based scaffolds for tissue engineering and photothermal therapy

Nanomedicine ◽  
2020 ◽  
Vol 15 (14) ◽  
pp. 1411-1417
Author(s):  
Valentina Palmieri ◽  
Marco De Spirito ◽  
Massimiliano Papi
Keyword(s):  
Tissue Regeneration ◽  
Photothermal Therapy ◽  
Near Infrared ◽  
High Growth ◽  
Factor Loading ◽  
Future Research ◽  
Promising Alternative ◽  
Nir Light ◽  
Innovative Biomaterials ◽  
Light Absorbers

Researchers have been creating 3D replicas of damaged tissues for millions of patients by using innovative biomaterials. While these scaffolds have regenerative properties, it would be beneficial if they could be utilized for local therapies, such as for cancer treatment. This report discusses the main advances in graphene scaffold design for near-infrared (NIR) photothermal therapy (PTT). NIR-PTT is a promising alternative for cancer cell killing, mediated by an increase of temperature due to NIR light-absorbers delivered to the tumor proximity. Graphene is a bidimensional material largely exploited in nanomedicine for its unique properties, such as high growth factor loading, which induces cell differentiation and its capacity to absorb NIR light. Here we cover aspects of future research in multifunctional graphene implants for cancer therapy and tissue regeneration.

scholarly journals Vein Pattern Locating Technology for Cannulation: A Review of the Low-Cost Vein Finder Prototypes Utilizing near Infrared (NIR) Light to Improve Peripheral Subcutaneous Vein Selection for Phlebotomy

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3573 ◽  
Author(s):  
Cheng-Tang Pan ◽  
Mark D. Francisco ◽  
Chung-Kun Yen ◽  
Shao-Yu Wang ◽  
Yow-Ling Shiue
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Low Cost ◽  
Venous Blood ◽  
Cost Effective ◽  
Medical Laboratory ◽  
Scientific Publications ◽  
Medical Practitioners ◽  
Nir Light ◽  
Number Of Patients

One of the most common means for diagnosis is through medical laboratory testing, which primarily uses venous blood as a sample. This requires an invasive method by cannulation that needs proper vein selection. The use of a vein finder would help the phlebotomist to easily locate the vein, preventing possible pre-analytical error in the specimen collection and even more discomfort and pain to the patient. This paper is a review of the scientific publications on the different developed low-cost vein finder prototypes utilizing camera assisted near infrared (NIR) light technology. Methods: Electronic databases were searched online, these included PubMed (PMC), MEDLINE, Science Direct, ResearchGate, and Institute of Electrical and Electronics Engineers (IEEE) Xplore digital library. Specifically, publications with the terms vein finder prototype, NIR technology, vein detection, and infrared imaging were screened. In addition, reference lists were used to further review related publications. Results: Cannulation challenges medical practitioners because of the different factors that can be reduced by the utilization of a vein finder. A limited number of publications regarding the assessment of personnel performing cannulation were observed. Moreover, variations in methodology, number of patients, type of patients according to their demographics and materials used in the assessment of the developed prototypes were noted. Some studies were limited with regard to the actual human testing of the prototype. Conclusions: The development of a low-cost effective near infrared (NIR) vein finder remains in the phase of improvement. Since, it is being challenged by different human factors, increasing the number of parameters and participants/human for actual testing of the prototypes must also be taken into consideration for possible commercialization. Finally, it was noted that publications regarding the assessment of the performance of phlebotomists using vein finders were limited.

scholarly journals Large-area flexible nanostripe electrodes featuring plasmon hybridization engineering

Nano Research ◽  
2020 ◽  
Vol 14 (3) ◽  
pp. 858-867
Author(s):  
Carlo Mennucci ◽  
Debasree Chowdhury ◽  
Giacomo Manzato ◽  
Matteo Barelli ◽  
Roberto Chittofrati ◽  
...  
Keyword(s):  
Near Infrared ◽  
Low Cost ◽  
Near Field ◽  
Photovoltaic Devices ◽  
Large Area ◽  
Cross Sectional ◽  
Additional Degree ◽  
Photon Management ◽  
Plasmon Resonances ◽  
Localized Plasmon Resonances

AbstractMultifunctional flexible Au electrodes based on one-dimensional (1D) arrays of plasmonic gratings are nanofabricated over large areas with an engineered variant of laser interference lithography optimized for low-cost transparent templates. Au nanostripe (NS) arrays achieve sheet resistance in the order of 20 Ohm/square on large areas (∼ cm2) and are characterized by a strong and dichroic plasmonic response which can be easily tuned across the visible (VIS) to near-infrared (NIR) spectral range by tailoring their cross-sectional morphology. Stacking vertically a second nanostripe, separated by a nanometer scale dielectric gap, we form near-field coupled Au/SiO2/Au dimers which feature hybridization of their localized plasmon resonances, strong local field-enhancements and a redshift of the resonance towards the NIR range. The possibility to combine excellent transport properties and optical transparency on the same plasmonic metasurface template is appealing in applications where low-energy photon management is mandatory like e.g., in plasmon enhanced spectroscopies or in photon harvesting for ultrathin photovoltaic devices. The remarkable lateral order of the plasmonic NS gratings provides an additional degree of freedom for tailoring the optical response of the multifunctional electrodes via the excitation of surface lattice resonances, a Fano-like coupling between the broad localised plasmonic resonances and the collective sharp Rayleigh modes.

All solution processed low turn-on voltage near infrared LEDs based on core–shell PbS–CdS quantum dots with inverted device structure

Nanoscale ◽  
2014 ◽  
Vol 6 (15) ◽  
pp. 8551-8555 ◽  
Author(s):  
Rafael S. Sanchez ◽  
Enrico Binetti ◽  
Jose A. Torre ◽  
G. Garcia-Belmonte ◽  
Marinella Striccoli ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Cds Quantum Dots ◽  
Large Area ◽  
Device Structure ◽  
Solution Processed ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Turn On ◽  
Nir Light

Highly luminescent PbS-CdS quantum dots are used for the fabrication of all-solution processed NIR-Light Emitting Devices (LEDs) with inverse configuration on large area.

Fabrication and Application of Nanostructures Using Gas-Assisted Hot Embossing and Self-Assembled Nanospheres

2015 ◽  
Vol 659 ◽  
pp. 399-403 ◽  
Author(s):  
Rong Hong Hong ◽  
Cheng Cih ◽  
To Chung Shu ◽  
Sen Yeu Yang
Keyword(s):  
Near Infrared ◽  
Low Cost ◽  
Hot Embossing ◽  
Large Area ◽  
Self Assembled Monolayer ◽  
Glass Substrates ◽  
Plasma Sputtering ◽  
Nanostructure Arrays ◽  
Self Assembled ◽  
Better Than

We develop a simple and competitive fabrication of antireflective (AR) films with high-ordered nanostructure arrays on polycarbonate (PC) substrate by using gas-assisted hot embossing and a self-assembled technique. In this method, a self-assembled monolayer of polystyrene (PS) nanospheres is well-patterned on glass substrates as the first template. Subsequently, we use the plasma sputtering to deposit a conductive layer onto the surface of nanosphere (NS) patterned substrates, and then, electroforming is applied to fabricate a nickel mold with an inverse shape of nanospheres. In the last step, a unique glass transition is utilized to duplicate nanostructures on PC films via gas-assisted hot embossing. Not only in visible light but in near infrared, the optical properties of this AR film are similar or better than for other methods. This fabrication process also has great potential in industry, with its simplicity, large-area but low-cost.

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