ZnO nanowire/TiO2 nanoparticle photoanodes prepared by the ultrasonic irradiation assisted dip-coating method

Gan, Xueping; Li, Xiaomin; Gao, Xiangdong; Zhuge, Fuwei; Yu, Weidong

doi:10.1016/j.tsf.2010.01.043

Cited by 39 publications

(22 citation statements)

References 16 publications

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“…In this paper, the goal is to obtain materials with desired properties by simple method and reliable deposits. So this is why the "sol-gel dip-coating" technique has been chosen to coat thin films of ZnO and ZnO:Sn conductors [20] [21]. Therefore, to study their morphological, structural, and optical properties, pure ZnO and ZnO:Sn thin films have been characterized by combining the following relevant techniques: Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), UV-Visible Spectrophotometer (U-Vis) and X-Ray Photoelectron Spectroscopy (XPS).…”

Section: Introductionmentioning

confidence: 99%

Influence of Sn Low Doping on the Morphological, Structural and Optical Properties of ZnO Films Deposited by Sol Gel Dip-Coating

Zegadi¹,

Abdelkebir²,

Chaumont³

et al. 2014

AMPC

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In this work, Undoped Zinc Oxide (ZnO) and Sn-doped Zinc Oxide (ZnO:Sn) films have been deposited by sol-gel dip coating method, where the Sn/Zn atomic ratio was 3% and 5% in the solution. The effects of Sn incorporation on morphological, structural and optical properties of ZnO films were investigated. The Scanning Electron Microscopy (SEM) showed that the morphological surface of the films was affected by Sn low doping. The X-Ray Diffraction (XRD) patterns showed that all films have polycrystalline structures, and the doping incorporation has not lead to substantial changes in the structural characteristics of ZnO films. The crystallite size was calculated using the well-known Scherrer's formula and found to be in the range of 23 -40 nm. The measurements from UV-Visible Spectrophotometer (U-Vis) indicated that the highest average optical transmittance in the visible region was related to Undoped ZnO film, then the optical band gap and Urbach energy values of thin films were calculated. The X-Ray Photoelectron Spectroscopy (XPS) has demonstrated that Sn is incorporated in ZnO lattice.

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Section: Introductionmentioning

confidence: 99%

Influence of Sn Low Doping on the Morphological, Structural and Optical Properties of ZnO Films Deposited by Sol Gel Dip-Coating

Zegadi¹,

Abdelkebir²,

Chaumont³

et al. 2014

AMPC

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“…Similar scheme has been practiced in nanoparticles/nanowires composite systems [4,6,38,40,41], but in most of these cases, the constituent nanoparticles and nanowires were of the same material [38]. We employed SnO 2 nanoparticles for this purpose largely based on the following considerations: 1) DSSCs based on SnO 2 /ZnO nanoparticles composites have been demonstrated and the synergy between the components has been discussed [42,43]; 2) SnO 2 , being more stable than TiO 2 and ZnO, is more amenable for film formation via sol-gel reactions at moderate temperatures; 3) Our survey experiments on blending in TiO 2 nanoparticles, albeit with increased V oc , resulted in significantly reduced J sc , which was also revealed in photoanodes consisting of TiO 2 nanoparticles/ ZnO nanowire arrays blends [6,40]. On top of these, a proper electronic structure combination of the components, e.g., conduction band edge positions [44], distribution of accepting states in the conduction bands [39], is critical to the performance of the composite photoanodes.…”

Section: Sno 2 Nanoparticles/zno Nanotetrapods Composite Photoanodementioning

confidence: 72%

“…Key to the idea is that the ZnO nanotetrapods' network figures as a global electron transport highway while the encapsulated nanoparticles serve to increase the RF and take part in the local charge transport [4,38,39]. Similar scheme has been practiced in nanoparticles/nanowires composite systems [4,6,38,40,41], but in most of these cases, the constituent nanoparticles and nanowires were of the same material [38]. We employed SnO 2 nanoparticles for this purpose largely based on the following considerations: 1) DSSCs based on SnO 2 /ZnO nanoparticles composites have been demonstrated and the synergy between the components has been discussed [42,43]; 2) SnO 2 , being more stable than TiO 2 and ZnO, is more amenable for film formation via sol-gel reactions at moderate temperatures; 3) Our survey experiments on blending in TiO 2 nanoparticles, albeit with increased V oc , resulted in significantly reduced J sc , which was also revealed in photoanodes consisting of TiO 2 nanoparticles/ ZnO nanowire arrays blends [6,40].…”

Section: Sno 2 Nanoparticles/zno Nanotetrapods Composite Photoanodementioning

confidence: 98%

Dye-sensitized solar cells based on ZnO nanotetrapods

Chen

Yang

2011

Front. Optoelectron. China

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In this paper, we reviewed recent systematic studies of using ZnO nanotetrapods for photoanodes of dye-sensitized solar cells (DSSCs) in our group. First, the efficiency of power conversion was obtained by more than 3.27% by changes of conditions of dye loading and film thickness of ZnO nanotetrapod. Short-circuit photocurrent densities (J sc ) increased with the film thickness, J sc would not be saturation even the film thickness was greater than 35 μm. The photoanode architecture had been charactered by good crystallinity, network forming ability, and limited electron-hopping interjunctions. Next, DSSCs with high efficiency was devised by infiltrating SnO 2 nanoparticles into the ZnO nanotetrapods photoanodes. Due to material advantages of both constituents described as above, the composite photoanodes exhibited extremely large roughness factors (RFs), good charge collection, and tunable light scattering properties. By varying the composition of the composite photoanodes, we had achieved an efficiency of 6.31% by striking a balance between high efficiency of charge collection for SnO 2 nanoparticles rich films and high light scattering ability for ZnO nanotetrapods rich films. An ultrathin layer of ZnO was found to form spontaneously on the SnO 2 nanoparticles, which primarily was responsible for enhancing open-circuit photovoltage (V oc ). We also identified that recombination in SnO 2 /ZnO composite films was mainly determined by ZnO shell condition on SnO 2 , whereas electron transport was greatly influenced by the morphologies and sizes of ZnO crystalline additives. Finally, we applied the composite photoanodes of SnO 2 nanoparticles/ZnO nanotetrapods to flexible DSSCs by low temperature technique of "acetic acid gelation-mechanical press-ammonia activation." The efficiency has been achieved by 4.91% on ITO-coated polyethylenenaphtalate substrate. The formation of a thin ZnO shell on SnO 2 nanoparticles, after ammonia activation, was also found to be critical to boosting V oc and to improving inter-particles contacts. Mechanical press, apart from enhancing film durability, also significantly improved charge collection. ZnO nanotetrapods had been demonstrated to be a better additive than ZnO particles for the improvement of charge collection in SnO 2 /ZnO composite photoanodes regardless of whether they were calcined.

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“…EIS methods have been used previously to characterise the electrical behaviour of free standing nanowires for different applications, such as electrochemical capacitors [15], photo-anodes [16] and elements for photovoltaics [17]. EIS has also been applied for resolving the electrodeposition parameters of metallic nanowires into the pores of AAO membranes and their interfacial electron transport [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Application of Electrochemical Impedance for Characterising Arrays of Bi2S3 Nanowires

Kunakova

Katkevics

Vīksna

et al. 2015

Electrochimica Acta

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ZnO nanowire/TiO2 nanoparticle photoanodes prepared by the ultrasonic irradiation assisted dip-coating method

Cited by 39 publications

References 16 publications

Influence of Sn Low Doping on the Morphological, Structural and Optical Properties of ZnO Films Deposited by Sol Gel Dip-Coating

Influence of Sn Low Doping on the Morphological, Structural and Optical Properties of ZnO Films Deposited by Sol Gel Dip-Coating

Dye-sensitized solar cells based on ZnO nanotetrapods

Application of Electrochemical Impedance for Characterising Arrays of Bi2S3 Nanowires

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