Synthesis and characterization of textured Al-doped zinc oxide films prepared by template-directed deposition

Eisele, Rahel; Blumenstein, Nina J.; Baier, Johannes; Walheim, Stefan; Schimmel, Thomas

doi:10.1039/c3ce41701h

Cited by 12 publications

(10 citation statements)

References 63 publications

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“…Further, it has excellent electrical, optical properties and thermal stability. [10][11][12][13][14][15][16][17] Among them, ZnO with Ta doping (TaZO) seems to be very scarce, but promising material due to its noticeable transport characteristics. Therefore, doped zinc oxide films have gained the materials scientists' attention, for the replacement of ITO films, as they can exhibit low electrical resistivity and high optical transmission in the visible spectrum range when compared with pristine ZnO.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a novel low-cost triple layer system (TaZO/Ag/TaZO) with an enhanced quality factor for transparent electrode applications

Ravichandran¹,

Subha²,

Manivasaham³

et al. 2016

RSC Adv.

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A triple layer system (TaZO/Ag/TaZO) consists of tantalum doped zinc oxide (TaZO) as the top and bottom layers and metallic silver (Ag) as the intermediate layer was deposited onto glass substrates. The top and bottom layers were deposited using an inexpensive homemade Automated Jet Nebulizer Spray Technique (AJNSP) and the intermediate Ag layer was deposited using thermal evaporation technique. Three different sets of samples with top and bottom layers having thickness values around 50, 75 and 100 nm were prepared keeping the thickness of the middle layer constant (15 nm). The influence of thickness on structural,electrical, optical and photoluminescence properties along with surface morphology of the deposited triple layer system was studied. Structural study revealed that the deposited films have hexagonal wurzite structure of ZnO and x-ray photoelectron spectroscopic study confirms the presence of the expected elements in the system. Optical studies show that the overall thickness of the films influences only marginally the transmittance of the films. The decrease in sheet resistance with the increase in thickness is explained on the basis of grain boundary scattering mechanism. Among all the films examined, the multi-layer film with 75+15+75 nm thickness exhibits best quality factor (8.98 × 10 -3 (Ω/sq.) -1 ), which may be considered as a potential candidate for transparent electrode applications. To the best of our knowledge, this is the first report in which a low cost chemical technique is employed to fabricate a triple layered system. ________________________________________________________________________________________________________________

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Section: Introductionmentioning

confidence: 99%

Fabrication of a novel low-cost triple layer system (TaZO/Ag/TaZO) with an enhanced quality factor for transparent electrode applications

Ravichandran¹,

Subha²,

Manivasaham³

et al. 2016

RSC Adv.

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“…Biopolymeric templates and their structure-inducing properties are in the focus of many recent works and issued in a recent collection [ 9 – 13 ]. With respect to ZnO, bio-templates are used for tailoring the morphology and crystallite sizes of ZnO [ 13 – 23 ], whereas n-type impurity dopants (e.g., Al 3+ , Ga 3+ or In 3+ ) have a significant influence on its optical properties [ 1 – 2 24 – 33 ]. In both cases, properties can be adjusted to match the requirements for different applications.…”

Section: Introductionmentioning

confidence: 99%

“…In both cases, properties can be adjusted to match the requirements for different applications. Also the use of self-assembled monolayers (e.g., made from 1-thioacetato-16-(trichlorosilyl)hexadecane [ 34 – 35 ] or 3-aminopropyltriethoxysilane [ 33 ]) and polyelectrolytes [ 36 ] as organic templates are known, which can modify the surface charge on the substrates for ZnO precipitation under moderate conditions.…”

Section: Introductionmentioning

confidence: 99%

Chemical bath deposition of textured and compact zinc oxide thin films on vinyl-terminated polystyrene brushes

Blumenstein¹,

Hofmeister²,

Lindemann³

et al. 2016

Beilstein J. Nanotechnol.

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SummaryIn this study we investigated the influence of an organic polystyrene brush on the deposition of ZnO thin films under moderate conditions. On a non-modified SiOx surface, island growth is observed, whereas the polymer brush induces homogeneous film growth. A chemical modification of the polystyrene brushes during the mineralization process occurs, which enables stronger interaction between the then polar template and polar ZnO crystallites in solution. This may lead to oriented attachment of the crystallites so that the observed (002) texture arises. Characterization of the templates and the resulting ZnO films were performed with ζ-potential and contact angle measurements as well as scanning electron microscopy (SEM), atomic force microscopy (AFM) and X-ray diffraction (XRD). Infrared spectroscopy (IR) measurements were used to investigate the polystyrene brushes before and after modification.

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“…One type of self-assembly is template-guided self-assembly, which plays an important role in biological processes relevant for biomineralization [ 7 – 12 ]. There are numerous approaches to harness and use this principle for artificial processes, which may be of great technological significance [ 13 – 15 ]. Recently, we reported the site-selective mineralization of a semiconductor material, zinc oxide (ZnO), on a chemically patterned surface [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Template-controlled mineralization: Determining film granularity and structure by surface functionality patterns

Blumenstein¹,

Berson²,

Walheim³

et al. 2015

Beilstein J. Nanotechnol.

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SummaryWe present a promising first example towards controlling the properties of a self-assembling mineral film by means of the functionality and polarity of a substrate template. In the presented case, a zinc oxide film is deposited by chemical bath deposition on a nearly topography-free template structure composed of a pattern of two self-assembled monolayers with different chemical functionality. We demonstrate the template-modulated morphological properties of the growing film, as the surface functionality dictates the granularity of the growing film. This, in turn, is a key property influencing other film properties such as conductivity, piezoelectric activity and the mechanical properties. A very pronounced contrast is observed between areas with an underlying fluorinated, low energy template surface, showing a much more (almost two orders of magnitude) coarse-grained film with a typical agglomerate size of around 75 nm. In contrast, amino-functionalized surface areas induce the growth of a very smooth, fine-grained surface with a roughness of around 1 nm. The observed influence of the template on the resulting clear contrast in morphology of the growing film could be explained by a contrast in surface adhesion energies and surface diffusion rates of the nanoparticles, which nucleate in solution and subsequently deposit on the functionalized substrate.

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Synthesis and characterization of textured Al-doped zinc oxide films prepared by template-directed deposition

Cited by 12 publications

References 63 publications

Fabrication of a novel low-cost triple layer system (TaZO/Ag/TaZO) with an enhanced quality factor for transparent electrode applications

Fabrication of a novel low-cost triple layer system (TaZO/Ag/TaZO) with an enhanced quality factor for transparent electrode applications

Chemical bath deposition of textured and compact zinc oxide thin films on vinyl-terminated polystyrene brushes

Template-controlled mineralization: Determining film granularity and structure by surface functionality patterns

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