Journal ArticleDOI
Growth of Carbon Dot-Decorated ZnO Nanorods on a Graphite-Coated Paper Substrate to Fabricate a Flexible and Self-Powered Schottky Diode for UV Detection.
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TLDR
The fabrication of self-powered, carbon dot (CD) enhanced, flexible ZnO/graphite heterojunction based UV detector, where cellulose paper has been used as the substrate with Schottky characteristics is reported.Abstract:
The fabrication of flexible as well as self-powered optoelectronic devices is a growing and challenging area of research Some scientists have reported the fabrication of either flexible or self-powered photodetectors recently However, most of the literature studies fail to report the fabrication of self-powered as well as flexible photodetectors This study reports the fabrication of self-powered, carbon dot (CD)-enhanced, flexible ZnO/graphite heterojunction-based UV detector where cellulose paper has been used as the substrate A detailed study on the crystallinity and the defects of the ZnO nanorods has been done with appropriate characterizations The CD-enhanced ZnO/graphite heterojunction showed Schottky characteristics The Schottky parameters such as the barrier height, ideality factor, and the series resistance have also been calculated using the Cheung-Cheung method The observed values of barrier height, ideality factor, and the series resistance are 074 eV, 374, and 503 kΩ, respectively The transient response at self-powered condition has been demonstrated The response time and the recovery time at self-powered condition have also been calculated with the help of the transient response, and those values are ∼2 and ∼32 s, respectively The responsivity and the specific detectivity of the fabricated UV detector have been calculated as 957 mA/W and 427×108 Jones, respectively, at 330 nm wavelength, which is quite comparable with literature-reported values, considering a self-powered photodetectorread more
Citations
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Journal ArticleDOI
Self-powered UV photodetectors based on ZnO nanomaterials
TL;DR: In this paper, a review of the recent research on different types of ZnO-based self-powered UV photodetectors is outlined, and possible opportunities and directions for the future developments of these photodeterors are proposed.
Journal ArticleDOI
Current and future perspectives of carbon and graphene quantum dots: From synthesis to strategy for building optoelectronic and energy devices
TL;DR: In this article, the role of edge effects and attached functional groups on flexible optoelectronic devices for energy harvesting applications is discussed, and the underlying challenges and future prospects for CQD/GQD-based devices with respect to their performance, sustainability, durability, and costeffectiveness to efficiently realize their industrial scale-up.
Journal ArticleDOI
Self-powered High-performance Flexible GaN/ZnO Heterostructure UV Photodetectors with Piezo-phototronic Effect Enhanced Photoresponse
Yiyao Peng,Junfeng Lu,Xiandi Wang,Wenda Ma,Miaoling Que,Qiushuo Chen,Fangtao Li,Xianhu Liu,Wenchao Gao,Caofeng Pan +9 more
TL;DR: In this paper , a self-powered high-performance flexible ultraviolet photodetector was fabricated based on p-GaN/n-ZnO heterostructure, which shows extraordinary on/off current ratio, detectivity, sensitivity and stability at a bias voltage of 0 V.
Journal ArticleDOI
Photocatalytic Degradation of Methylene Blue Using Zinc Oxide Nanorods Grown on Activated Carbon Fibers
Borhan Albiss,Muna Abu-Dalo +1 more
TL;DR: In this article, the synthesis, characterization, and photocatalytic performance of zinc oxide/activated carbon fiber nanocomposites prepared by hydrothermal method were investigated, where zinc oxide nanoparticles (ZnO-NP) were deposited as seeds on porous activated carbon fiber (ACF) substrates.
Journal ArticleDOI
Flexible ultraviolet photodetector based on single ZnO microwire/polyaniline heterojunctions.
TL;DR: In this paper, a flexible UV photodetector based on a combination of single ZnO microwire and polyaniline hybrid heterojunction was proposed. But the performance of the photodeter was not evaluated.
References
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Journal ArticleDOI
ZnO Nanowire UV Photodetectors with High Internal Gain
Cesare Soci,Arthur Zhang,Bin Xiang,Shadi A. Dayeh,David P. R. Aplin,Jeongwon Park,Xinyu Bao,Yu-Hwa Lo,Deli Wang +8 more
TL;DR: Despite the slow relaxation time, the extremely high internal gain of ZnO NW photodetectors results in gain-bandwidth products higher than approximately 10 GHz, which promise a new generation of phototransistors for applications such as sensing, imaging, and intrachip optical interconnects.
Journal ArticleDOI
Williamson-Hall analysis in estimation of lattice strain in nanometer-sized ZnO particles
TL;DR: In this paper, the root mean square strain was determined from the interplanar spacing and strain estimated from the three models, viz, uniform deformation model, unweighted deformation stress model, and uniform density model.
Journal ArticleDOI
Simplified Theory of Space-Charge-Limited Currents in an Insulator with Traps
Abstract: An ohmic contact between a metal and an insulator facilitates the injection of electrons into the insulator. Subsequent flow of the electrons is space-charge limited. In real insulators the trapping of electrons in localized states in the forbidden gap profoundly influences the current flow. The interesting features of the current density-voltage ($J\ensuremath{-}V$) characteristic are confined within a "triangle" in the $logJ\ensuremath{-}logV$ plane bounded by three limiting curves: Ohm's law, Child's law for solids ($J\ensuremath{\propto}{V}^{2}$) and a traps-filled-limit curve which has a voltage threshold and an enormously steep current rise. Simple inequalities relating the true field at the anode to the ohmic field facilitate qualitative discussion of the $J\ensuremath{-}V$ characteristic. Exact solutions have been obtained for an insulator with a single, discrete trap level in a simplified theory which idealizes the ohmic contact and neglects the diffusive contribution to the current. The discrete trap level produces the same type of nonlinearity discovered by Smith and Rose and attributed by them to traps distributed in energy.
Journal ArticleDOI
Space‐Charge‐Limited Currents in Organic Crystals
Peter Mark,Wolfgang Helfrich +1 more
TL;DR: In this article, the acceptor electrode can form ohmic contact for hole injection into these crystals and that space-charge-limited currents can be drawn through them, which strongly indicates that the acceptors electrode can strongly indicate that the hole mobility in p−terphenyl is about 3×10−2 cm2/v sec, is independent of the field at least up to about 4×104 v/cm, and the hole trap concentration is at least 1013 cm−3.
Journal ArticleDOI
Solution-processed ultraviolet photodetectors based on colloidal ZnO nanoparticles.
TL;DR: The photocurrent of the device is associated with a light-induced desorption of oxygen from the nanoparticle surfaces, thus removing electron traps and increasing the free carrier density which in turn reduces the Schottky barrier between contacts and ZnO nanoparticles for electron injection.