Hydrothermal synthesis of improved ZnO crystals for epitaxial growth of GaN thin films

Kortunova, E.V.; Nikolaeva, Natalia; Chvanski, P.P.; Maltsev, V.; Волкова, Е. А.; Копорулина, Е. В.; Leonyuk, N. I.; Kuech, T. F.

doi:10.1007/s10853-007-2036-5

Cited by 17 publications

(32 citation statements)

References 9 publications

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“…crystals with a size of 30 × 30 × 12 mm were grown for 100 days [3]. In addition, such crystals inevitably contain ionic impurities of K, Li, and other uncontrollable metals.…”

Section: Orininal Text Published In Optics and Spectroscopy Vol 111 mentioning

confidence: 99%

“…Due to its unique optical, acoustic, and electric properties, zinc oxide finds use in gas sensors, varistors, and generators of surface acoustic waves [1]. ZnO single crystals are also used as substrates for obtaining gallium nitride thin films, since both crystals (ZnO and GaN) belong to the wurtzite structural type and the incommensurability parameter of their lattices along the с axis is 1.8% [3]. Recently, powders, films, and ceramics of zinc oxide have been finding use in the scintillation technique [4].…”

Section: Introductionmentioning

confidence: 99%

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Optical and luminescence properties of zinc oxide (Review)

Родный¹,

Khodyuk²

2011

Opt. Spectrosc.

375

190

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Abstract-We generalize and systematize basic experimental data on optical and luminescence properties of ZnO single crystals, thin films, powders, ceramics, and nanocrystals. We consider and study mechanisms by which two main emission bands occur, a short-wavelength band near the fundamental absorption edge and a broad long-wavelength band, the maximum of which usually lies in the green spectral range. We determine a relationship between the two luminescence bands and study in detail the possibility of controlling the characteristics of ZnO by varying the maximum position of the short-wavelength band. We show that the optical and luminescence characteristics of ZnO largely depend on the choice of the corresponding impurity and the parameters of the synthesis and subsequent treatment of the sample. Prospects for using zinc oxide as a scintillator material are discussed. Additionally, we consider experimental results that are of principal interest for practice.

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“…crystals with a size of 30 × 30 × 12 mm were grown for 100 days [3]. In addition, such crystals inevitably contain ionic impurities of K, Li, and other uncontrollable metals.…”

Section: Orininal Text Published In Optics and Spectroscopy Vol 111 mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical and luminescence properties of zinc oxide (Review)

Родный¹,

Khodyuk²

2011

Opt. Spectrosc.

375

190

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“…It is reasonable to suggest that these pits correspond to dislocations in ZnO. [17][18][19] We suppose that H + can react with top O atoms of the O-face to form H 2 O. Such reactions may result in the removal of O and/or the formation of -OH groups on the surface of the O-face.…”

Section: Resultsmentioning

confidence: 99%

“…In the case of HCl etching of the Zn-face, the surface is initially covered by hydroxyl groups due to the use of KOH or NaOH in the hydrothermal growth. [19][20][21][22] Therefore, the UV intensity shows a systematic increase at the beginning of irradiation. In ZnO ceramics, there is polarity mixing, resulting in a case intermediate between O-and Zn-faces.…”

Section: Resultsmentioning

confidence: 99%

Effects of Chemical Treatment on the Luminescence of ZnO

Dierre

Yuan

Armani

et al. 2010

Journal of Elec Materi

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The effects of chemical treatment on the luminescence of ZnO were investigated by cathodoluminescence. For this purpose, ZnO ceramics and O-and Zn-terminated faces of ZnO single crystals were studied. The samples were dipped in KOH and HCl solutions as well as pure H 2 O for 3 min. H 2 O and HCl treatments of ZnO ceramics can increase or decrease the initial ultraviolet (UV) intensity depending on the location examined, and induce an increase of the UV intensity under e-beam irradiation. HCl treatment of the Zn-face of ZnO single crystals slightly affects the surface morphology and the luminescence. HCl treatment of the O-face etches the surface to hexagonal pyramidal features. In addition, the initial UV intensity is always lower for the HCltreated than for the untreated O-face, while the UV intensity increases at the beginning of e-beam irradiation. These results suggest that the UV intensity is influenced by the surface and bulk reactions of H + with ZnO.

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“…it has a native substrate [10,11,12]. Among the most commonly used growth techniques for growing large area single crystal ZnO that is, by melt, chemical vapor deposition and hydrothermal technique, the latter is particularly interesting due to the fairly good quality of the substrates [13]and the possibility of scaling the growth method [14].…”

Section: Motivation and General Backgroundmentioning

confidence: 99%

Electrical characteristics of palladium Schottky contacts to hydrogen peroxide treated hydrothermally grown ZnO

Schifano¹,

Monakhov²,

Großner³

et al. 2007

Applied Physics Letters

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The formation of Schottky barrier contacts to hydrogen peroxide treated ZnO has been investigated. Low resistivity hydrothermally grown single crystal ZnO wafers of n-type were used. Pd contacts deposited on organic solvent cleaned O face (0001¯) showed Ohmic behavior, while on the H2O2 treated O face up to nine orders of magnitude in rectification of the current was obtained for biases of −2 and +2V. Concurrently, the surface roughness increases from 1.0±0.5 up to 2.0±0.5nm due to the H2O2 treatment. A majority of the contacs deposited were stable or improved their performance by annealing in air at 200°C for 30min. However, the contacts both before and after the annealing exhibited ideality factors of at least ∼1.8 at +0.5V suggesting that the current transport cannot be described as purely thermionic. Finally, results of capacitance versus voltage and capacitance versus temperature measurements are discussed and show a dominant electron state at ∼0.32eV below the conduction band edge.

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Hydrothermal synthesis of improved ZnO crystals for epitaxial growth of GaN thin films

Cited by 17 publications

References 9 publications

Optical and luminescence properties of zinc oxide (Review)

Optical and luminescence properties of zinc oxide (Review)

Effects of Chemical Treatment on the Luminescence of ZnO

Electrical characteristics of palladium Schottky contacts to hydrogen peroxide treated hydrothermally grown ZnO

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