Hybridizing ZnO Nanowires with Micropyramid Silicon Wafers as Superhydrophobic High‐Efficiency Solar Cells

Liu, Yan; Das, Arnab; Xu, Sheng; Lin, Ziyin; Xu, Chen; Wang, Zhong Lin; Rohatgi, A.; Wong, C.P.

doi:10.1002/aenm.201100287

Cited by 95 publications

(73 citation statements)

References 32 publications

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“…Graffiti prevention (anti-graffiti) treatments can be in the form of (a) transparent and self-adherent polymer films that can be peeled off and replaced from time to time; (b) in the form of polymeric paints (non-sacrificial) that are able to repel stains and graffiti tagging; or (c) they can be stain and dust repellent coatings obtained from ceramic precursors particularly suitable for special applications such as solar panels [5,6]. It is also important to take into account how the graffiti is applied.…”

Section: Introductionmentioning

confidence: 99%

On the Durability and Wear Resistance of Transparent Superhydrophobic Coatings

Bayer

2017

Coatings

117

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Transparent liquid repellent coatings with exceptional wear and abrasion resistance are very demanding to fabricate. The most important reason for this is the fact that majority of the transparent liquid repellent coatings have so far been fabricated by nanoparticle assembly on surfaces in the form of films. These films or coatings demonstrate relatively poor substrate adhesion and rubbing induced wear resistance compared to polymer-based transparent hydrophobic coatings. However, recent advances reported in the literature indicate that considerable progress has now been made towards formulating and applying transparent, hydrophobic and even oleophobic coatings onto various substrates which can withstand certain degree of mechanical abrasion. This is considered to be very promising for anti-graffiti coatings or treatments since they require resistance to wear abrasion. Therefore, this review intends to highlight the state-of-the-art on materials and techniques that are used to fabricate wear resistant liquid repellent transparent coatings so that researchers can assess various aptitudes and limitations related to translating some of these technologies to large scale stain repellent outdoor applications.

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Section: Introductionmentioning

confidence: 99%

On the Durability and Wear Resistance of Transparent Superhydrophobic Coatings

Bayer

2017

Coatings

117

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“…A p-type Si wafer is washed by deionized (DI) water, and alcohol and dried at room temperature, followed by sputtering a thin layer of ZnO (100 nm) as seed layer for low temperature hydrothermal growth of ZnO NWs array to form p-Si/n-ZnO heterojunctions. [23,24] Side-view and top-view scanning electron microscopy (SEM) images presented in Figure 1b1,b2 indicate ZnO NWs array with diameters of 50-70 nm and lengths of 500 nm. Indium-tin oxide (ITO) is deposited on ZnO NWs as the transparent top-electrode, and copper is sputtered on the p-type Si as bottom-electrode.…”

mentioning

confidence: 99%

Ultrafast Response p‐Si/n‐ZnO Heterojunction Ultraviolet Detector Based on Pyro‐Phototronic Effect

et al. 2016

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A light-self-induced pyro-phototronic effect in wurtzite ZnO nanowires is proposed as an effective approach to achieve ultrafast response ultraviolet sensing in p-Si/n-ZnO heterostructures. The relatively long response/recovery time of zinc-oxide-based ultraviolet sensors in air/vacuum has long been an obstacle to developing such detectors for practical applications. The response/recovery time and photoresponsivity are greatly improved by the pyro-phototronic effect.

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“…Thus they can successfully be employed in photovoltaic or photocatalytic applications, [27][28][29] in which optical losses caused by dust deposition and light reflection at the surface may be reduced having a superhydrophobic surface made by ZnO NWs. 30 Alternatively, a possible application in biomedical hard tissue implants can be also envisioned, where control on bone cell adhesion and proliferation can be optimized by varying the surface nanostructuration, even using hierarchical composite material surfaces. 25 In this work we therefore aim to study the surface properties, and in particular the wetting behavior, of hierarchical TiO 2 -ZnO nanostructures, efficiently controlling their hydrophobic behavior.…”

Section: Anodic Oxidationmentioning

confidence: 99%

Wetting Behavior of Hierarchical Oxide Nanostructures: TiO₂Nanotubes from Anodic Oxidation Decorated with ZnO Nanostructures

Ottone

Lamberti

Fontana

et al. 2014

J. Electrochem. Soc.

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Titania nanotubes (TiO 2 NTs) of 5 μm in length and 100 nm in the external diameter are easily formed by anodic oxidation. They are used as hollow substrates to deposit different ZnO nanostructures, such as nanoparticles and nanowires by employing two different techniques, electrodeposition and hydrothermal growth, respectively. In this way highly nanostructured and hierarchical sample surfaces were obtained, showing high level of crystallinity of both TiO 2 anatase and ZnO wurtzite materials. In addition, the wetting behavior drastically changed from the hydrophilic TiO 2 NTs surface to almost superhydrophobic surfaces of the hierarchical samples, thanks to the decoration with ZnO nanostructures. These results open interesting possibilities to employ our hierarchical TiO 2 -ZnO nanostructured materials as self-cleaning, antireflective or anti-fogging surfaces. These hierarchical and composite nanostructures could be thus efficiently used in photocatalytic devices, which would also benefit from the combination of both metal oxides for improved performances and efficiencies. Anodic oxidation1 is the process of forming an oxide on a metal surface by applying an electric potential through a suitable electrolyte. The metals that can be anodized belong to the so-called valve-metals group (Al, Ti, Zr, Nb, W, Ta, . . . ) and different kinds of ordered nanostructured oxides can be obtained. Compared with other synthesis approaches, electrochemical anodization is a simple and convenient technique to fabricate uniform layers of vertically self-oriented nanostructures. It has been widely accepted that the formation of the pores in anodic metal oxides is based on two continuous processes: the oxide dissolution at the electrolyte/oxide interface and the oxidation of metal at the oxide/metal interface.Particularly, anodic titanium oxide has attracted considerable interest since its unique properties make it useful for various functional applications, ranging from non-silicon solar cells 2-4 and photocatalysis 5 to energy storage. 6,7 In general, the morphology and the structure of the ordered layer are strongly affected by the electrochemical conditions (anodization voltage, distance between the electrodes, temperature) and the electrolyte composition. It is possible to grow titania nanotubes (NTs) with length varying between 100 nm up to 1 mm with a good control on the wall thickness and external roughness.In the present paper we report on the anodic oxidation of a titanium foil to form 5 μm long titania NTs. In order to create a hierarchical structure and then to study the wetting properties, we decorate both their inner and outer surface with zinc oxide (ZnO) nanoparticles of about 20 nm in diameter. In particular, by using two different growth techniques, it is possible to additionally enrich the planar surface of the TiO 2 NTs with either a network of ZnO nanowires using the hydrothermal approach, or with ZnO microparticles of about 150 nm using the electrodeposition method.ZnO is a n-type metal oxide semiconductor havi...

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Hybridizing ZnO Nanowires with Micropyramid Silicon Wafers as Superhydrophobic High‐Efficiency Solar Cells

Cited by 95 publications

References 32 publications

On the Durability and Wear Resistance of Transparent Superhydrophobic Coatings

On the Durability and Wear Resistance of Transparent Superhydrophobic Coatings

Ultrafast Response p‐Si/n‐ZnO Heterojunction Ultraviolet Detector Based on Pyro‐Phototronic Effect

Wetting Behavior of Hierarchical Oxide Nanostructures: TiO₂Nanotubes from Anodic Oxidation Decorated with ZnO Nanostructures

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Hybridizing ZnO Nanowires with Micropyramid Silicon Wafers as Superhydrophobic High‐Efficiency Solar Cells

Cited by 95 publications

References 32 publications

On the Durability and Wear Resistance of Transparent Superhydrophobic Coatings

On the Durability and Wear Resistance of Transparent Superhydrophobic Coatings

Ultrafast Response p‐Si/n‐ZnO Heterojunction Ultraviolet Detector Based on Pyro‐Phototronic Effect

Wetting Behavior of Hierarchical Oxide Nanostructures: TiO2Nanotubes from Anodic Oxidation Decorated with ZnO Nanostructures

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Wetting Behavior of Hierarchical Oxide Nanostructures: TiO₂Nanotubes from Anodic Oxidation Decorated with ZnO Nanostructures