Fabrication of ZnO/CdS core/shell nanowire arrays for efficient solar energy conversion

Tak, Youngjo; Hong, Suk Joon; Lee, Jae Sung; Yong, Kijung

doi:10.1039/b904993b

Cited by 394 publications

(307 citation statements)

References 28 publications

(27 reference statements)

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“…58(a), the surface photovoltage increased with increasing loading of CdS quantum dots on ZnO nanowires [472]. Following this strategy, quantum dots sporadically dispersed on the nanowire were replaced with core-shell structures of different materials, such as CdS [475], CdSe [211,212], and CdTe [213,476], to further enhance the device efficiency. Electron-hole pairs are generated when incident photons are absorbed by the quantum dots.…”

Section: Quantum Dot-sensitized Solar Cellsmentioning

confidence: 99%

One-dimensional ZnO nanostructures: Solution growth and functional properties

2011

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One-dimensional (1D) ZnO nanostructures have been studied intensively and extensively over the last decade not only for their remarkable chemical and physical properties, but also for their current and future diverse technological applications. This article gives a comprehensive overview of the progress that has been made within the context of 1D ZnO nanostructures synthesized via wet chemical methods. We will cover the synthetic methodologies and corresponding growth mechanisms, different structures, doping and alloying, positioncontrolled growth on substrates, and finally, their functional properties as catalysts, hydrophobic surfaces, sensors, and in nanoelectronic, optical, optoelectronic, and energy harvesting devices.

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Section: Quantum Dot-sensitized Solar Cellsmentioning

confidence: 99%

One-dimensional ZnO nanostructures: Solution growth and functional properties

2011

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“…For instance, transition metals as well as nitrogen and carbon have been used as dopants to reduce their bandgap energy for enhancing visible light absorption [10,[13][14][15][16][17]. Alternatively, organic dyes and inorganic QDs have been utilized as visible light absorbers to sensitize the metal oxides [18,19].…”

Section: Introductionmentioning

confidence: 99%

CdSe quantum dot-sensitized Au/TiO2 hybrid mesoporous films and their enhanced photoelectrochemical performance

Liu

Wang

et al. 2010

Nano Res.

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Novel CdSe quantum dot (QD)-sensitized Au/TiO 2 hybrid mesoporous films have been designed, fabricated, and evaluated for photoelectrochemical (PEC) applications. The Au/TiO 2 hybrid structures were made by assembly of Au and TiO 2 nanoparticles (NPs). A chemical bath deposition method was applied to deposit CdSe QDs on TiO 2 NP films with and without Au NPs embedded. We observed significant enhancements in photocurrent for the film with Au NPs, in the entire spectral region we studied (350-600 nm). Incident-photon-to-current efficiency (IPCE) data revealed an average enhancement of 50%, and the enhancement was more significant at short wavelength. This substantially improved PEC performance is tentatively attributed to the increased light absorption of CdSe QDs due to light scattering by Au NPs. Interestingly, without QD sensitization, the Au NPs quenched the photocurrent of TiO 2 films, due to the dominance of electron trapping over light scattering by Au NPs. The results suggest that metal NPs are potentially useful for improving the photoresponse in PEC cells and possibly in other devices such as solar cells based on QD-sensitized metal oxide nanostructured films. This work demonstrates that metal NPs can serve as light scattering centers, besides functioning as photo-sensitizers and electron traps. The function of metal NPs in a particular nanocomposite film is strongly dependent on their structure and morphology.

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“…To date, the reported type-II heterostructures are mainly based on II-VI and III-V binary semiconductors, such as ZnO/ZnS [41], ZnO/ZnSe [42], ZnO/ZnTe [23], CdSe/CdTe [43], and GaN/GaP [20], as shown in Table 1. Among them, ZnO-based heterostructures attracted more attentions due to its abundant resources and facilitating growth [44].…”

Section: Theoretical Design Of Type-ii Heterostructuresmentioning

confidence: 99%

Type-II Core/Shell Nanowire Heterostructures and Their Photovoltaic Applications

Cao

et al. 2012

Nano-Micro Lett.

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Nanowire-based photovoltaic devices have the advantages over planar devices in light absorption and charge transport and collection. Recently, a new strategy relying on type-II band alignment has been proposed to facilitate efficient charge separation in core/shell nanowire solar cells. This paper reviews the type-II heterojunction solar cells based on core/shell nanowire arrays, and specifically focuses on the progress of theoretical design and fabrication of type-II ZnO/ZnSe core/shell nanowire-based solar cells. A strong photoresponse associated with the type-II interfacial transition exhibits a threshold of 1.6 eV, which demonstrates the feasibility and great potential for exploring all-inorganic versions of type-II heterojunction solar cells using wide bandgap semiconductors. Future prospects in this area are also outlooked.

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Fabrication of ZnO/CdS core/shell nanowire arrays for efficient solar energy conversion

Cited by 394 publications

References 28 publications

One-dimensional ZnO nanostructures: Solution growth and functional properties

One-dimensional ZnO nanostructures: Solution growth and functional properties

CdSe quantum dot-sensitized Au/TiO2 hybrid mesoporous films and their enhanced photoelectrochemical performance

Type-II Core/Shell Nanowire Heterostructures and Their Photovoltaic Applications

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