Sensitization of nanocrystalline TiO2 electrode with quantum sized CdSe and ZnTCPc molecules

Fang, Jinghuai; Jing, Wu; Lu, Xiaomei; Shen, Yaochun; Zhang, Lu

doi:10.1016/s0009-2614(97)00333-3

Cited by 83 publications

(44 citation statements)

References 25 publications

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“…The small band gap semiconductor is primarily responsible for visiblelight absorption and sensitizing the large band gap semiconductor through electron and/or hole injection. Efficient electron injection requires that the bottom of the CB of the small band gap semiconductor be above the bottom of the CB of the large band gap semiconductor [103,[108][109][110]. The electron transfer between the two semiconductors could also enhance the charge separation and inhibit the recombination rate by forming a potential gradient at the interface.…”

Section: Heterogeneous Nanostructuresmentioning

confidence: 99%

Hydrogen generation from photoelectrochemical water splitting based on nanomaterials

Li¹,

Zhang²

2010

Laser & Photonics Reviews

288

208

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Hydrogen is potentially one of the most attractive and environmentally friendly fuels for energy applications. Safe and efficient generation, storage, and utilization of hydrogen present major challenges in its widespread use. Hydrogen generation from water splitting represents a holy grail in energy science and technology, as water is the most abundant hydrogen source on the Earth. Among different methods, hydrogen generation from photoelectrochemical (PEC) water splitting using semiconductors as photoelectrodes is one of the most scalable and cost-effective approaches. Compared to bulk materials, nanostructured semiconductors offer potential advantages in PEC application due to their large surface area and size-dependent properties, such as increased absorption coefficient, increased band-gap energy, and reduced carrier-scattering rate. This article provides a brief overview of some recent research activities in the area of hydrogen generation from PEC water splitting based on nanostructured semiconductor materials, with a particular emphasis on metal oxides. Both scientific and technical issues are critically analyzed and reviewed.SEM image of ZnO nanowire array on ITO substrate (left) and linear sweep voltammograms from undoped ZnO nanowires in the dark, undoped ZnO nanowires and N-doped ZnO nanowires at 100 mW/cm 2 .

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Section: Heterogeneous Nanostructuresmentioning

confidence: 99%

Hydrogen generation from photoelectrochemical water splitting based on nanomaterials

Li¹,

Zhang²

2010

Laser & Photonics Reviews

288

208

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show abstract

“…Solution-based deposition of CdS and CdSe quantum dots on oxide surfaces, similar to SILAR, has been successfully employed by Hodes and coworkers. [38][39][40] Other research groups have investigated various photoelectrochemical aspects of nanostructured films of TiO 2 , [3,13,[40][41][42][43][44][45][46] SnO 2 [47][48][49] and ZnO, [21,50,51] modified with metal chalcogenides. The present study evaluates the charge transfer TiO 2 nanotube arrays and particulate films are modified with CdS quantum dots with an aim to tune the response of the photoelectrochemical cell in the visible region.…”

Section: Introductionmentioning

confidence: 99%

Photosensitization of TiO₂ Nanostructures with CdS Quantum Dots: Particulate versus Tubular Support Architectures

Baker

Kamat

2009

Adv Funct Materials

784

574

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TiO2 nanotube arrays and particulate films are modified with CdS quantum dots with an aim to tune the response of the photoelectrochemical cell in the visible region. The method of successive ionic layer adsorption and reaction facilitates size control of CdS quantum dots. These CdS nanocrystals, upon excitation with visible light, inject electrons into the TiO2 nanotubes and particles and thus enable their use as photosensitive electrodes. Maximum incident photon to charge carrier efficiency (IPCE) values of 55% and 26% are observed for CdS sensitized TiO2 nanotube and nanoparticulate architectures respectively. The nearly doubling of IPCE observed with the TiO2 nanotube architecture is attributed to the increased efficiency of charge separation and transport of electrons.

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“…For example, (1) the ability to tune the band gap of QDs by varying the size of the nanocrystals [6][7][8] to allow for harvesting of different wavelengths of sunlight, (2) the superior photostability of QDs compared to dye molecules [9], and (3) the ability to generate multiple charge carriers with a single photon [10][11][12]. Various QDs, namely CdSe [13,14], InP [15], PbS [16], CdTe [17], CdS [18], have been used as sensitizers which harvest different regions of the AM 1.5 solar spectrum.…”

Section: Introductionmentioning

confidence: 99%

Sensitization of hydrothermally grown single crystalline TiO2 nanowire array with CdSeS nanocrystals for photovoltaic applications

Kumar

Madaria

et al. 2011

Nano Res.

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An oriented array of electron transporting nanowires, grown directly on a transparent conductor constitutes an optimal architecture for efficient photovoltaic applications. In addition, semiconductor nanocrystals can work as efficient light absorbers because of their tunable optical properties. In this paper, we use an oriented array of TiO 2 nanowires grown directly on a transparent conductive electrode and subsequently sensitized with colloidally grown CdSeS nanocrystal quantum dots (QDs), using an efficient bi-linker assisted methodology, to demonstrate photovoltaic cells. Upon excitation with light, exciton dissociation takes place at the nanowire-nanocrystal interface, after which, electrons are transported to the fluorine-doped tin oxide (FTO) electrode via single-crystalline TiO 2 nanowire channels. We demonstrate that an ex situ ligand exchange of QDs followed by sensitization on oxygen-plasma treated TiO 2 nanowires results in enhanced loading of QDs, as compared to the in situ ligand exchange approach. An array of 1 µm long TiO 2 nanowire sensitized with CdSeS nanocrystals exhibits photovoltaic effects with a short-circuit current of 2-3 mA/cm 2 , an open circuit voltage of 0.6-0.7 V and a fill factor of 52-65%, resulting in devices with efficiencies of up to 0.6%.

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Sensitization of nanocrystalline TiO2 electrode with quantum sized CdSe and ZnTCPc molecules

Cited by 83 publications

References 25 publications

Hydrogen generation from photoelectrochemical water splitting based on nanomaterials

Hydrogen generation from photoelectrochemical water splitting based on nanomaterials

Photosensitization of TiO₂ Nanostructures with CdS Quantum Dots: Particulate versus Tubular Support Architectures

Sensitization of hydrothermally grown single crystalline TiO2 nanowire array with CdSeS nanocrystals for photovoltaic applications

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Sensitization of nanocrystalline TiO2 electrode with quantum sized CdSe and ZnTCPc molecules

Cited by 83 publications

References 25 publications

Hydrogen generation from photoelectrochemical water splitting based on nanomaterials

Hydrogen generation from photoelectrochemical water splitting based on nanomaterials

Photosensitization of TiO2 Nanostructures with CdS Quantum Dots: Particulate versus Tubular Support Architectures

Sensitization of hydrothermally grown single crystalline TiO2 nanowire array with CdSeS nanocrystals for photovoltaic applications

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Photosensitization of TiO₂ Nanostructures with CdS Quantum Dots: Particulate versus Tubular Support Architectures