Cu doping effects on the electronic and optical properties of Cu-doped ZnO thin films fabricated by radio frequency sputtering

Sung, Nark‐Eon; Kang, Seen-Woong; Shin, Hyun‐Joon; Lee, Han-Koo; Lee, Ik-Jae

doi:10.1016/j.tsf.2012.11.046

Cited by 41 publications

(7 citation statements)

References 23 publications

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“…To achieve uniform, high-quality Cu-doped ZnO films, sputtering has been highlighted as one of the most promising techniques. Various sputtering sources have been tested including Cu-attached Zn metal [19,[21][22][23], two separate metals [24], ZnO and metallic Cu [25,26], and pre-synthesized Cu-doped ZnO [27]. In radio frequency (RF)/direct current (DC) co-sputtering and/or sequential sputtering, the use of two separate sources has been proven to be effective [25,28].…”

Section: Introductionmentioning

confidence: 99%

“…In radio frequency (RF)/direct current (DC) co-sputtering and/or sequential sputtering, the use of two separate sources has been proven to be effective [25,28]. This approach has resulted in a decrease in crystal orientation [22], shrinkage of lattice constants [22,27], reduction in band gap [23,28], and broadening of Raman peaks [23,24]. In these previous reports, however, the diverse processing parameters were not controlled; only the sputtering ratio of the two sources has been considered using single-step sputtering.…”

Section: Introductionmentioning

confidence: 99%

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Tuning the Morphology and Properties of Nanostructured Cu-ZnO Thin Films Using a Two-Step Sputtering Technique

Lee

Jung

et al. 2020

Metals

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Zinc oxide (ZnO) is a wide-band-gap semiconductor that is promising for use as a transparent conductive oxide film. To date, to improve their optoelectrical properties, pristine ZnO films have been doped with metals using various techniques. In this study, nanostructured Cu-ZnO thin films were synthesized using a modified two-step radio frequency magnetron sputtering technique with separate ZnO and metallic Cu targets. Controlling the timing of the Cu/ZnO co-sputtering and ZnO-only sputtering steps afforded a significant change in the resulting nanostructures, such as uniform Cu-ZnO and broccoli-structured Cu-ZnO thin films. Using various measurement techniques, the influence of Cu doping was analyzed in detail. Furthermore, a crystal growth model for the formation of the broccoli-like clusters was suggested. The Cu-ZnO thin films synthesized using this technique demonstrate a highly improved conductivity with some loss in optical transmittance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tuning the Morphology and Properties of Nanostructured Cu-ZnO Thin Films Using a Two-Step Sputtering Technique

Lee

Jung

et al. 2020

Metals

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“…The II-VI compound semiconductor zinc oxide (ZnO) is one of the promising materials for both optoelectronic and microelectronic due to its properties such as wide band gap (3.37 eV) in the near UV spectral region, high conductivity and large exciton binding energy of 60 meV at room temperature [1][2][3][4][5]. In order to enhance these properties ZnO should be doped with various dopants.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear optical properties of zinc oxide doped bismuth thin films using Z-scan technique

et al. 2016

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“…The lattice parameter of the calcined sample (Figure 9(a)) shows that it reduces with Cu doping and it enhances linearly with Cu concentration. This also proved indirectly that the Cu 2+ was substituted into ZnO lattice [35].The c/a ratio shows the hexagonal structure of ZnO is not effected by Cu doping as well as with changing concentration. The volume of the unit cell was calculated by using the equation [36].…”

Section: Effect Of Calcination Temperature On Structural Parametersmentioning

confidence: 72%

Effect of Milling Time, Doping Concentration and Temperature on the Structural, Microstructural and Optical Properties of Cu Doped ZnO Nanoceramics

Das

Parashar

et al. 2020

Preprint

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In this work, high energy ball milling (HEBM) technique has been employed to successfully synthesize a series of Cu-doped ZnO nanoceramics (Zn 1-x Cu x O) with Cu concentration x = 0, 0.01, 0.02, 0.03 and 0.04. The synthesized nanoceramic was analysed by XRD, FESEM, TEM, Uv-Vis-DRS. The structural, microstructural and optical properties of the synthesized sample with different duration of milling, doping concentration and temperature has been investigated. X-ray diffraction result indicates that the samples are wurtzite structure with single phase. A decrease in peak intensity was observed with increase in milling time. 10h milled Cu doped ZnO sample shows single phase. After calcination at 900 ºC in x = 0.04 few peaks related to CuO was observed indicating the solubility limit of Cu in ZnO is 3 atomic%. With increase in milling time crystallite decreases where as strain increases however after calcination crystallite increases where as strain decreases. After calcination peak intensity increases. The specific surface area of ZnO increases after Cu doping but decreases after calcination. Bond length decreases after calcination but lattice distortion increases. FESEM micrograph shows particle growth after calcination. The average particle size decreases with increase in Cu concentration(30 nm to 20 nm) whereas increases after calcination and sintering (488 nm-2706 nm).The band gap decreases with increasing in milling time also with increase in Cu concentration and after calcination. Cu doping in ZnO shows red shift indicating Cu doped ZnO samples are suitable for optoelectronic device applications.

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Cu doping effects on the electronic and optical properties of Cu-doped ZnO thin films fabricated by radio frequency sputtering

Cited by 41 publications

References 23 publications

Tuning the Morphology and Properties of Nanostructured Cu-ZnO Thin Films Using a Two-Step Sputtering Technique

Tuning the Morphology and Properties of Nanostructured Cu-ZnO Thin Films Using a Two-Step Sputtering Technique

Nonlinear optical properties of zinc oxide doped bismuth thin films using Z-scan technique

Effect of Milling Time, Doping Concentration and Temperature on the Structural, Microstructural and Optical Properties of Cu Doped ZnO Nanoceramics

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