Hierarchical ZnO Nanostructures Obtained by Electrodeposition

Xu, Longya; Chen, Qingwei; Xu, Dongsheng

doi:10.1021/jp071536a

Cited by 160 publications

(121 citation statements)

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“…II C, which is similar to the experimental loops reported in literature. 7,8,[23][24][25][26][27] and therefore suggests that film-electrode lattice mismatch may be one possible origin of imprint.…”

Section: ͑26͒mentioning

confidence: 99%

Mechanisms of imprint effect on ferroelectric thin films

Zhou

Chan

Lam

et al. 2005

Journal of Applied Physics

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We have developed a single/double layer model to explain horizontal shifting of measured D-E hysteresis loops ͑imprint͒ for ferroelectric thin films. Such phenomenon can be explained by considering three mechanisms or their multiple effects: ͑1͒ stress induced by film/electrode lattice mismatch or clamping, ͑2͒ domain pinning induced by, e.g., oxygen vacancies, or ͑3͒ degradation of ferroelectric properties in film/electrode surface layers. First, it is found that hysteresis loops under the influence of stress exhibit large horizontal shifts with magnitudes comparable to those observed in experiments. Second, a pseudo-non-switching layer with a large coercive field is assumed to be present at the film/electrode interface in an otherwise homogeneous ferroelectric thin film, and in this case our simulation also shows a large imprint effect. Third, it is also found that time-dependent space-charge-limited conduction is likely to be one origin for the occurrence of imprint.

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Section: ͑26͒mentioning

confidence: 99%

Mechanisms of imprint effect on ferroelectric thin films

Zhou

Chan

Lam

et al. 2005

Journal of Applied Physics

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“…20,21 The power conversion efficiencies of DSSCs employing ZnO, synthesized by these techniques as photoanodes, range from 0.5 to 5.6%. Unlike DSSCs employing TiO 2 , not much is known about the relationship between efficiency and the structure of the ZnO photoanodes.…”

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confidence: 99%

Microwave-assisted Hydrothermal Synthesis of Structure-controlled ZnO Nanocrystals and Their Properties in Dye-sensitized Solar Cells

Sun

Sugiura

et al. 2017

Electrochemistry

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Microwave-assisted hydrothermal synthesis of ZnO nanocrystals has resulted in two distinctive structures: hexagonal bi-pyramidal (HBP) and nano-sheet (NS) shapes from Zn(CH 3 COO) 2 solutions containing triethanolamine or benzene tetracarboxylic acid as structure directing agents, respectively. Observation by field-emission scanning electron microscope, high resolution transmission electron microscope as well as analysis of selected area electron beam diffraction patterns revealed that the predominantly exposed facets of HBP and NS ZnO are (102) and (100) faces, occupying 84 and 76% of the total surface area, respectively. Adsorption of D149 and eosin Y photosensitizer dyes onto HBP and NS ZnO was studied in comparison with a randomly structured commercial ZnO nanocrystal (MZ). Density of dye packing was found to be in the order of HBP > MZ > NS, for which HBP was 2 to 5 times higher than NS. Consequently, dye-sensitized solar cells employing HBP ZnO exhibited the highest short circuit photocurrent, but also the lowest open circuit voltage. By contrast, the DSSCs employing NS ZnO exhibited the highest voltage among the three.

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“…S2). The sharper (hkl) peaks for the branched ZnO arrays were observed as the TAA treatment time increased, indicating relative easy grain growths with the increase of the branch densities [14,35]. The photocurrent-voltage curves of the QDSCs under AM 1.5 illumination, shown in Fig.…”

Section: Resultsmentioning

confidence: 95%