Synthesis and electrical characterization of vertically-aligned ZnO–CuO hybrid nanowire p–n junctions

Pukird, Supakorn; Song, Wooseok; Noothongkaew, Suttinart; Kim, Seong Ku; Min, Bok Ki; Kim, Seong Jun; Kim, Ki Woong; Myung, Sung; An, Ki‐Seok

doi:10.1016/j.apsusc.2015.05.164

Cited by 15 publications

(5 citation statements)

References 24 publications

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“…The electrochemical impedance spectroscopy (EIS) measurements were made in 0.1 M KCl, at open circuit potential (OCP) values, using a perturbation of 10 mV for 60 harmonic frequencies ranging from 100 kHz to 0.1 Hz at 10 steps/decade. The impedance spectra were analysed by fitting with an equivalent electrical circuit using ZView software (Scribner Associates, USA) 40 containing as parameters R s , CPE and W s . The R s consists of the solution and the bulk composite resistances.…”

Section: Methodsmentioning

confidence: 99%

Core-shell nanowire arrays based on ZnO and CuxO for water stable photocatalysts

Florica

Costas

Preda

et al. 2019

Sci Rep

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Staggered gap radial heterojunctions based on ZnO-CuxO core-shell nanowires are used as water stable photocatalysts to harvest solar energy for pollutants removal. ZnO nanowires with a wurtzite crystalline structure and a band gap of approximately 3.3 eV are obtained by thermal oxidation in air. These are covered with an amorphous CuxO layer having a band gap of 1.74 eV and subsequently form core-shell heterojunctions. The electrical characterization of the ZnO pristine and ZnO-CuxO core-shell nanowires emphasizes the charge transfer phenomena at the junction and at the interface between the nanowires and water based solutions. The methylene blue degradation mechanism is discussed taking into consideration the dissolution of ZnO in water based solutions for ZnO nanowires and ZnO-CuxO core-shell nanowires with different shell thicknesses. An optimum thickness of the CuxO layer is used to obtain water stable photocatalysts, where the ZnO-CuxO radial heterojunction enhances the separation and transport of the photogenerated charge carriers when irradiating with UV-light, leading to swift pollutant degradation.

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Section: Methodsmentioning

confidence: 99%

Core-shell nanowire arrays based on ZnO and CuxO for water stable photocatalysts

Florica

Costas

Preda

et al. 2019

Sci Rep

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“…where V is the applied reverse bias voltage, V bi is the built-in voltage (diffusion potential), ε ′ is the relative dielectric constant (equal to 2.4 (59) ) and N a is the effective doping density. T , q, ε 0 , and k represent respectively the measurement temperature, electron charge, vacuum permittivity and Boltzmann's constant (60) . It is assumed that the doping level of ZnO:Al is much higher than that of CuO and therefore the depletion region extends mainly in the CuO film.…”

Section: R Shmentioning

confidence: 99%

Structural, optical and electrical properties of Aluminum doped ZnO, CuO and their heterojunction fabricated using spin coating and Rf-Sputtering techniques

Agdad¹

2020

IJST

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Objectives: The aim of this work is to fabricate and analyze the Aluminum Doped ZnO, Copper Oxide CuO and their heterojunction CuO/ZnO:Al using Spin Coating and Rf-Sputtering techniques. Methods: ZnO:Al was synthesized from a sol-gel precursor and deposited on Indium Tin Oxide-coated glass substrate ITO using spin coating. CuO thin films, on the other hand, were elaborated by RF-sputtering. The characterization of both thin films was performed by means of X-ray diffraction, scanning electron microscopy and UV-visible-NIR double beam spectrophotometer. The CuO/ZnO:Al heterojunction was fabricated and characterized using current voltage, capacitance-voltage and conductancevoltage measurements. Findings: The collected results confirm the rectifying nature of the junction with a built-in voltage V bi of about 1.6 V.

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“…Enhanced solar cells with various semiconductor nanowires and diverse formation of P/N junctions were widely reported based on the feature of high absorption of solar spectrum and collection of photogenerated carriers of nanowires [88][89][90][91][92][93][94][95][96][97]. Ebaid [98] investigated the combination between the band gap engineering and performance of solar cell by tuning the content of In, as shown in Fig.…”

Section: Characterization Of Nanowires For Photovoltaicsmentioning

confidence: 99%

Atomic-scale tomography of semiconductor nanowires

Ringer

Zheng

2015

Materials Science in Semiconductor Processing

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Synthesis and electrical characterization of vertically-aligned ZnO–CuO hybrid nanowire p–n junctions

Cited by 15 publications

References 24 publications

Core-shell nanowire arrays based on ZnO and CuxO for water stable photocatalysts

Core-shell nanowire arrays based on ZnO and CuxO for water stable photocatalysts

Structural, optical and electrical properties of Aluminum doped ZnO, CuO and their heterojunction fabricated using spin coating and Rf-Sputtering techniques

Atomic-scale tomography of semiconductor nanowires

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