Zinc oxide doped single wall carbon nanotubes in hole transport buffer layer

Mbuyise, Xolani G.; Arbab, Elhadi A. A.; Kaviyarasu, K.; Pellicane, Giuseppe; Maaza, M.; Mola, Genene Tessema

doi:10.1016/j.jallcom.2017.02.249

Cited by 51 publications

(18 citation statements)

References 32 publications

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“…The thermal quenching effect is responsible for the temperature‐dependent decrement. In addition, the green emission intensity relies on the crystal symmetry of Ho 3+ sites in the KNNST host based on the phenomenological Judd‐Ofelt theory . Lower crystal symmetry contributes to stronger green emission intensity.…”

Section: Resultsmentioning

confidence: 99%

Outstanding optical temperature sensitivity and dual‐mode temperature‐dependent photoluminescence in Ho³⁺‐doped (K,Na)NbO₃–SrTiO₃ transparent ceramics

Lin

et al. 2019

J Am Ceram Soc

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High optical temperature sensing properties based on rare-earth-doped (K,Na) NbO 3 -based ferro-/piezoelectrics have attracted much attention due to their potential application in novel optoelectronic devices. Here, we fabricated Ho 3+ -doped (K 0.5 Na 0.5 )NbO 3 -SrTiO 3 transparent ceramics by conventional pressureless sintering. Their microstructures, transmittances, up-conversion photoluminescence, and optical temperature sensing properties have been characterized in details. Because of the cubic-like phase, dense, and fine-grained structure as well as relaxor-like feature, the ceramics exhibit high transmittance (~70%) in the near-infrared region. Owing to Ho 3+ , green and red up-conversion emissions have been observed, which can be easily modulated by temperature. The ceramics have stable emission colors (<200°C) and superior temperature-modulating emission color-tunable performance (>200°C). Furthermore, the temperature sensing behavior based on the thermally coupled levels ( 5 F 4 , 5 S 2 ) of Ho 3+ has been analyzed by a fluorescence intensity ratio technique. The transparent ceramics possess outstanding optical temperature sensitivity (~0.0096/K at 550 K), higher than most rare-earth-doped materials (e.g.

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Section: Resultsmentioning

confidence: 99%

Outstanding optical temperature sensitivity and dual‐mode temperature‐dependent photoluminescence in Ho³⁺‐doped (K,Na)NbO₃–SrTiO₃ transparent ceramics

Lin

et al. 2019

J Am Ceram Soc

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“…The measurement in the dark is based on the space‐charge‐limited current (SCLC), which was done by suppressing the photogenerated current in the device. In this condition, charge carriers originate from injection from the electrode via the external circuit with an increased rectification ratio created by a potential barrier transfer across the junction 101 . An ohmic contact is manifested by the curve at a lower voltage, which is followed by a sharp gradient, indicating a filled trap in the system.…”

Section: Resultsmentioning

confidence: 99%

“…In this condition, charge carriers originate from injection from the electrode via the external circuit with an increased rectification ratio created by a potential barrier transfer across the junction. 101 An ohmic contact is manifested by the curve at a lower voltage, which is followed by a sharp gradient, indicating a filled trap in the system. Thereafter, the curve becomes asymptotic and reaches the maximum; this is the SCLC regime, wherein all the traps are filled and charge mobility is primarily dependent on the bulk material characteristics.…”

Section: Photovoltaic Performancementioning

confidence: 99%

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Hydrothermal synthesis of reduced graphene oxide‐anatase titania nanocomposites for dual application in organic solar cells

2020

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Lately, there has been increased interest in the design of graphene-based hybrid nanomaterials and their application to modify properties of organic solar cells (OSCs). Herein, we demonstrate an efficient route for the successful hydrothermal synthesis of reduced graphene oxide-anatase titania (RGOT) nanocomposites. Five nanocomposites with different titania concentrations, that is, RGOT-50, RGOT-75, RGOT-86, RGOT-90, and RGOT-92, were prepared. The nanocomposite RGOT-92 with the overall best properties was used to modify both the photoactive layer (P3HT:PCBM:RGOT) and hole transport layer (PEDOT:PSS:RGOT) of an OSC so as to assist in solar energy absorption by way of enhancing optical absorption and creating an efficient charge transport channel. The nanocomposites prepared consist of highly crystalline, spherical, and uniformly shaped TiO 2 nanoparticles, with an average particle size of approximately 3.0 nm, deposited on the basal plane of reduced graphene oxide. Also, the nanocomposites show much reduced bandgap energies and low rates of electron-hole recombination. The incorporation of RGOT in the active layer effectively improved photon absorption, leading to high photoexciton generation. In addition, effective exciton dissociation was energetically favoured in the RGOT-modified hole transport layer (HTL), which concurs with the observed enhanced conductivity of the medium. Thus, the integration of RGOT in the active layer and HTL remarkably resulted in a high short-circuit current density (J sc), low sheet resistance (R s), and, consequently, improved photovoltaic performance. An enhanced photocurrent was noted, as high as 13 mA cm −2 , from the OSCs by inlaying RGOT in the photoactive layer. An increased power conversion efficiency of up to 64% was achieved by the incorporation of RGOT in the photoactive layer. Thus, the utilized hydrothermal synthesis route provided nanocomposites with enhanced photoelectronic properties, with promising applications in nanoelectronic devices.

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“…The introduction of CNTs and organic polymers in crystalline silicon hybrid heterojunction solar cells has also gained a great interest in recent years. The main advantages of such heterojunctions include the low-cost fabrication, remarkable power conversion efficiency, simple processing, lightweight, and low-temperature process [ 325 ]. Among the various organic/Si solar cells, PEDOT:PSS is the most widely used conducting polymer as the hole selective layer.…”

Section: Cnt Embedded With Conjugated Polymersmentioning

confidence: 99%

Carbon Nanomaterials Embedded in Conductive Polymers: A State of the Art

et al. 2021

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Carbon nanomaterials are at the forefront of the newest technologies of the third millennium, and together with conductive polymers, represent a vast area of indispensable knowledge for developing the devices of tomorrow. This review focusses on the most recent advances in the field of conductive nanotechnology, which combines the properties of carbon nanomaterials with conjugated polymers. Hybrid materials resulting from the embedding of carbon nanotubes, carbon dots and graphene derivatives are taken into consideration and fully explored, with discussion of the most recent literature. An introduction into the three most widely used conductive polymers and a final section about the most recent biological results obtained using carbon nanotube hybrids will complete this overview of these innovative and beyond belief materials.

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Zinc oxide doped single wall carbon nanotubes in hole transport buffer layer

Cited by 51 publications

References 32 publications

Outstanding optical temperature sensitivity and dual‐mode temperature‐dependent photoluminescence in Ho³⁺‐doped (K,Na)NbO₃–SrTiO₃ transparent ceramics

Outstanding optical temperature sensitivity and dual‐mode temperature‐dependent photoluminescence in Ho³⁺‐doped (K,Na)NbO₃–SrTiO₃ transparent ceramics

Hydrothermal synthesis of reduced graphene oxide‐anatase titania nanocomposites for dual application in organic solar cells

Carbon Nanomaterials Embedded in Conductive Polymers: A State of the Art

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Zinc oxide doped single wall carbon nanotubes in hole transport buffer layer

Cited by 51 publications

References 32 publications

Outstanding optical temperature sensitivity and dual‐mode temperature‐dependent photoluminescence in Ho3+‐doped (K,Na)NbO3–SrTiO3 transparent ceramics

Outstanding optical temperature sensitivity and dual‐mode temperature‐dependent photoluminescence in Ho3+‐doped (K,Na)NbO3–SrTiO3 transparent ceramics

Hydrothermal synthesis of reduced graphene oxide‐anatase titania nanocomposites for dual application in organic solar cells

Carbon Nanomaterials Embedded in Conductive Polymers: A State of the Art

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Outstanding optical temperature sensitivity and dual‐mode temperature‐dependent photoluminescence in Ho³⁺‐doped (K,Na)NbO₃–SrTiO₃ transparent ceramics

Outstanding optical temperature sensitivity and dual‐mode temperature‐dependent photoluminescence in Ho³⁺‐doped (K,Na)NbO₃–SrTiO₃ transparent ceramics