Effect of seed layers on low-temperature, chemical bath deposited ZnO nanorods-based near UV-OLED performance

Rezaie, Mahdiyar Nouri; Manavizadeh, Negin; Nayeri, Fatemeh Dehghan; Bidgoli, Maryam Massah; Nadimi, Ebrahim; Boroumand, Farhad Akbari

doi:10.1016/j.ceramint.2017.12.086

Cited by 30 publications

(9 citation statements)

References 63 publications

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“…49 10 16 and ´-5.85 10 cm 15 3 for (a) and (b), respectively (shown in table 3). The obtained data show good agreement with other works [28]. Like the organic layer, hybrid perovskite is influenced by trapping and scattering of defects.…”

Section: Device Simulation Resultssupporting

confidence: 90%

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Effect of ZnO nanorods and nanotubes on the electrical and optical characteristics of organic and perovskite light-emitting diodes

Mohammadnejad¹,

Ahadzadeh²,

Rezaie³

2021

Nanotechnology

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Due to their suitable electrical and optical properties, ZnO nanostructure-based organic light-emitting diodes (LEDs) and perovskite LEDs can be utilized in the optoelectronics industry. A combination of ZnO nanorods and nanotubes with various types of polymers or hybrid perovskites leads to better waveguides and transportation of carriers. Therefore, more efficient LEDs are offered to the industry. In this research, four devices, including ZnO nanorod (nanotube)/MEH-PPV (CH3NH3PbI3) LEDs are simulated by SILVACO TCAD software. To provide deeper understanding of the impact of applying nanorods and nanotubes in hybrid heterostructures, an ab initio study has been conducted and the electronic structure, density of states, absorption coefficient and dielectric function of each of these nanostructures have been scrutinized. Subsequently, the obtained data have been utilized in the SILVACO simulation, and characteristics such as the current–voltage curve, light power–voltage curve, electroluminescence (EL) spectra and radiative recombination rate of four devices have been investigated. By employing a combination of a perovskite layer and ZnO nanotubes, the turn-on voltage of the simulated devices has been decreased from 13.7 V to 1.1 V. Moreover, a drastic increment in ultraviolet emission from devices based on ZnO nanotubes can be seen, which stems from occurrence of the whispering gallery mode and low defects of nanotubes compared to nanorods. A redshift caused by a reduction in the band gaps of the nanostructures can also be observed in the EL spectra.

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Section: Device Simulation Resultssupporting

confidence: 90%

“…Rezaie et al employed the chemical bath deposition method to grow ZnO NRs. Their turn-on voltage for AZO-and ZnO-based OLEDs was 21 V and 23 V, respectively, at a current density of 10 mAcm 2 [28]. Moreover, PEDOT:PSS is another kind of polymer that researchers have given attention.…”

Section: Introductionmentioning

confidence: 99%

Effect of ZnO nanorods and nanotubes on the electrical and optical characteristics of organic and perovskite light-emitting diodes

Mohammadnejad¹,

Ahadzadeh²,

Rezaie³

2021

Nanotechnology

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“…In general, the spectrum shows the decrease of transmittance with increasing growth durations. This is possibly related to enhancing the scattering effect in ZnO NRs grown at a longer time in two ways that have thicker ZnO NRs [ 47 , 48 , 49 ]. Additionally, the transmittance spectrum, in the absence of air bubbles, is almost two times higher than the transmittance spectrum when air bubbles are involved ( Figure 15 ).…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of High-Quality UV Photodetectors Based ZnO Nanorods Using Traditional and Modified Chemical Bath Deposition Methods

et al. 2021

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Ultraviolet (UV) photodetectors (PDs) based on high-quality well-aligned ZnO nanorods (NRs) were fabricated using both modified and conventional chemical bath deposition (CBD) methods. The modified chemical bath deposition (M-CBD) method was made by adding air bubbles to the growth solution during the CBD process. The viability and effectiveness of M-CBD were examined by developing UV PDs based on ZnO NRs. The ZnO nano-seed layer was coated on a glass substrate utilizing radiofrequency (RF) sputtering. The impact of the different growth-times on morphology, growth rate, crystal structure, and optical and chemical properties were investigated systematically using different characterization techniques, such as field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) analysis, UV–VIS double beam spectrometer, and energy dispersive X-ray analysis (EDX), respectively. The Al/ZnO UV PDs based on ZnO nanorods were fabricated with optimum growth conditions through the two methods of preparation. This study showed that the synthesized ZnO NRs using the M-CBD method for different growth times possess better properties than the conventional method under similar deposition conditions. Despite having the highest aspect ratio and growth rate of ZnO NRs, which were found at 4 h growth duration for both methods, the aspect ratio of ZnO NRs using the M-CBD technique was comparatively higher than the conventional CBD method. Besides, the UV PDs fabricated by the M-CBD method at 5 V bias voltage showed high sensitivity, short response time, quick recovery time, high gain, low dark current, and high photocurrent compared with the UV PD device fabricated by the conventional CBD method.

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“…This phenomenon could be related to the film's crystallite size, decreasing as the thickness increases. Rezaie et al (2018) reported that the increase in film thickness might be promoted by decreasing crystallite size because bigger crystallite size may induce lower-strained films. Moreover, the reduction of crystallite size and film strain enhancement was supported by the decreased d and c film values obtained.…”

Section: Resultsmentioning

confidence: 99%

ZnO Multilayer Thin Films as The Seed Layer for ZnO Nanorods: Morphology, Structural and Optical properties

Rahman¹,

Zulkefle²,

Herman³

et al. 2022

JST

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The effect of zinc oxide (ZnO) multilayer thin film thicknesses, deposited via the sol-gel spin coating technique, on the morphology, structural and optical properties of ZnO nanorods (ZNR) grown on the ZnO thin films were explored in this investigation. The ZNR was grown using the chemical bath deposition method on the ZnO thin film seed layer (SL). We found that ZnO thin film SL morphology changes according to the number of layers based on the results. Eventually, these changes also influence the structures of ZNR. ZNR structures improved when the thickness of the seed layer increased. Besides the surface roughness, better crystalline quality films were obtained when more layers were deposited. This crystalline quality then influenced the optical characteristics of both ZnO and ZNR thin films. The optical properties from UV-Vis showed transmittance in the visible region, showing that the ZnO films produced were suitable to be applied to solar cells. ZNR-based solar cells have become one of the promising materials to be studied further due to the environment-friendly, low-cost, and well-abundant material for solar cell applications.

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Effect of seed layers on low-temperature, chemical bath deposited ZnO nanorods-based near UV-OLED performance

Cited by 30 publications

References 63 publications

Effect of ZnO nanorods and nanotubes on the electrical and optical characteristics of organic and perovskite light-emitting diodes

Effect of ZnO nanorods and nanotubes on the electrical and optical characteristics of organic and perovskite light-emitting diodes

Fabrication and Characterization of High-Quality UV Photodetectors Based ZnO Nanorods Using Traditional and Modified Chemical Bath Deposition Methods

ZnO Multilayer Thin Films as The Seed Layer for ZnO Nanorods: Morphology, Structural and Optical properties

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