Surface polarity control in ZnO films deposited by pulsed laser deposition

Luo, Ching Hsing; Ling, C. C.; Rahman, M. Azizar; Phillips, M. R.; Ton-That, Cuong; Liao, Changzhong; Shih, Kaimin; Lin, Jingyang; Tam, Ho Won; Djurišić, Aleksandra B.; Wang, Shuangpeng

doi:10.1016/j.apsusc.2019.03.228

Cited by 33 publications

(22 citation statements)

References 53 publications

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“…Transparent conducting oxide (TCO) thin films based on zinc oxide (ZnO) have received much interest because of relatively inexpensiveness compared to indium tin oxide (ITO). ZnO is a multifunctional II-VI group semiconductor which creating a center of attention to researchers because of its fascinating properties such as wide band gap of 3.37 eV at room temperature, large exciton binding energy (60 meV), high optical transparency, high surface stability, large electrochemical coupling coefficient and strong excitonic emission etc (Dehkordi et al, 2019;Luo et al, 2019;Gandhi et al, 2019;Karim et al, 2015aKarim et al, , 2016. Although, stoichiometric ZnO is an insulator, it exists as an n-type semiconductor partially due to its deviation from stoichiometry i.e., due to the presence of interstitial Zn atoms (Zn i ) in large voids and the presence of oxygen vacancies (V o ) in the crystal lattice and partially due to the presence of background donors such as H and Al (Joseph et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Effect of Ni doping on structure, morphology and opto-transport properties of spray pyrolised ZnO nano-fiber

Ali

Khan

Karim

et al. 2020

Heliyon

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Nano-fiber structure of ZnO and Ni doped ZnO (Ni:ZnO) transparent thin films have been deposited on glass substrate at 350 C at an ambient atmosphere via spray pyrolysis technique. The structural, surface morphological and opto-electrical properties of ZnO and Ni doped ZnO thin films have been investigated. The XRD patterns show that the films are of polycrystalline in nature having preferential orientation (0 0 2) plane for ZnO changes to (1 0 1) by Ni doping in ZnO matrix. Optical study exhibits red shifting in band gap energy with Ni doping due to spd hybridization and display high absorption coefficient of the order of 10 7 m À1 . The photoluminescence (PL) spectra indicate blue emissions in all samples. Electrical measurement confirms the resistivity of the film decreases remarkably with Ni doping and electrical transport is mainly thermally activated. From Hall Effect study, it is confirmed that all the samples are n-type having carrier concentration of the order of 10 18 cm À3 . Both mobility and carrier concentrations of the films became higher than ZnO sample with the increase of Ni concentration.

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Section: Introductionmentioning

confidence: 99%

Effect of Ni doping on structure, morphology and opto-transport properties of spray pyrolised ZnO nano-fiber

Ali

Khan

Karim

et al. 2020

Heliyon

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“…Of course, cost control is also considered to be a key factor for the applications of the ZnO thin films. In the past decades, ZnO thin films have been synthesized by metal-organic chemical vapor deposition (MOCVD) [22], molecular beam epitaxy (MBE) [23], pulsed laser deposition (PLD) [24], magnetron sputtering [11], thermal evaporation [25], sol-gel method [26], etc. [27,28].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of ZnO Thin Films Grown on Quartz Glass and Sapphire (001) Substrates by Means of Magnetron Sputtering and High-Temperature Annealing

et al. 2019

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In this work, we reported a comparative study of ZnO thin films grown on quartz glass and sapphire (001) substrates through magnetron sputtering and high-temperature annealing. Firstly, the ZnO thin films were deposited on the quartz glass and sapphire (001) substrates in the same conditions by magnetron sputtering. Afterwards, the sputtered ZnO thin films underwent an annealing process at 600 °C for 1 h in an air atmosphere to improve the quality of the films. X-ray diffraction, scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy (XPS), ultraviolet-visible spectra, photoluminescence spectra, and Raman spectra were used to investigate the structural, morphological, electrical, and optical properties of the both as-received ZnO thin films. The ZnO thin films grown on the quartz glass substrates possess a full width of half maximum value of 0.271° for the (002) plane, a surface root mean square value of 0.50 nm and O vacancies/defects of 4.40% in the total XPS O 1s peak. The comparative investigation reveals that the whole properties of the ZnO thin films grown on the quartz glass substrates are comparable to those grown on the sapphire (001) substrates. Consequently, ZnO thin films with high quality grown on the quartz glass substrates can be achieved by means of magnetron sputtering and high-temperature annealing at 600 °C.

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“…The background pressure was 10 −4 mbar. The samples were grown on the c-sapphire substrate with different oxygen pressures P(O 2 ) of 0 Pa, 1 Pa and 3 Pa for the fixed growth time of 3 h. This method of growth yields undoped ZnO films with the polarity of O-face [41]. The annealing was carried out in Ar atmosphere for a period of 45 min.…”

Section: Methodsmentioning

confidence: 99%

Ferromagnetism in undoped ZnO grown by pulsed laser deposition

Azeem

Luo

et al. 2020

Mater. Res. Express

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Undoped ZnO films grown on sapphire by pulsed laser deposition are magnetic at room temperature. A comprehensive study involving x-ray diffraction, positron annihilation spectroscopy, and superconducting quantum Interference device-vibrating sample magnetometer is performed to study the origin of the observed magnetization. Correlations between the saturation magnetization, V Zn −2V O concentration and surface to volume ratio of the grain found experimentally show that the magnetization is associated with the vacancy cluster and probably V Zn −2V O residing on the grain surface.

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Surface polarity control in ZnO films deposited by pulsed laser deposition

Cited by 33 publications

References 53 publications

Effect of Ni doping on structure, morphology and opto-transport properties of spray pyrolised ZnO nano-fiber

Effect of Ni doping on structure, morphology and opto-transport properties of spray pyrolised ZnO nano-fiber

Comparative Study of ZnO Thin Films Grown on Quartz Glass and Sapphire (001) Substrates by Means of Magnetron Sputtering and High-Temperature Annealing

Ferromagnetism in undoped ZnO grown by pulsed laser deposition

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