scholarly journals Cosensitization Properties of Glutathione-Protected Au25Cluster on Ruthenium Dye-Sensitized TiO2Photoelectrode

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Kazuya Nakata ◽  
Sho Sugawara ◽  
Wataru Kurashige ◽  
Yuichi Negishi ◽  
Morio Nagata ◽  
...  
Keyword(s):  
Near Infrared ◽  
Adsorption Property ◽  
Optical Absorption Spectroscopy ◽  
Ionization Mass ◽  
Laser Desorption Ionization ◽  
Photoelectric Conversion ◽  
Dye Sensitized ◽  
Ru Complex ◽  
Transmission Electron ◽  
Ruthenium Dye

Cosensitization by glutathione-protected Au25clusters on Ru complex, N719-sensitized TiO2photoelectrodes is demonstrated. Glutathione-protected Au25clusters showed no significant changes in properties after adsorption onto TiO2particles, as confirmed by optical absorption spectroscopy, transmission electron microscopy, and laser desorption/ionization mass spectrometry. Adsorption property of the glutathione-protected Au25clusters depends on the pH, which affects the incident photon-to-current conversion efficiency (IPCE) of the TiO2photoelectrode containing Au25clusters. When pH < 5, the IPCE increases with pH. Conversely, the IPCE decreases with pH when pH > 7. The IPCE of a TiO2photoelectrode sensitized by both glutathione-protected Au25clusters and N719 was increased compared with photoelectrodes containing either glutathione-protected Au25clusters or N719, which suggests that glutathione-protected Au25clusters act as a coadsorbent for N719 on TiO2photoelectrodes. This is also supported by the results that the IPCE of N719-sensitized TiO2photoelectrodes increased upon addition of glutathione. Furthermore, cosensitization by glutathione-protected Au25clusters on N719-sensitized TiO2photoelectrodes allows that wavelength of photoelectric conversion was extended to the near infrared (NIR) region. These results suggest that glutathione-protected Au25clusters act not only as a coadsorbent to increase IPCE but also as an NIR-active sensitizer.

Visible to Near-Infrared Photoelectric Conversion in a Dye-Sensitized Solar Cell Using Ru(II) Porphyrin with Azopyridine Axial Ligands

2012 ◽  
Vol 51 ◽  
pp. 10NE02 ◽  
Author(s):  
Takumi Kinoshita ◽  
Jun-ichi Fujisawa ◽  
Jotaro Nakazaki ◽  
Satoshi Uchida ◽  
Takaya Kubo ◽  
...  
Keyword(s):  
Solar Cell ◽  
Near Infrared ◽  
Dye Sensitized Solar Cell ◽  
Photoelectric Conversion ◽  
Dye Sensitized ◽  
Axial Ligands

scholarly journals Precursor concentration and temperature controlled formation of polyvinyl alcohol-capped CdSe-quantum dots

2010 ◽  
Vol 1 ◽  
pp. 119-127 ◽  
Author(s):  
Chetan P Shah ◽  
Madhabchandra Rath ◽  
Manmohan Kumar ◽  
Parma N Bajaj
Keyword(s):  
Quantum Dots ◽  
Polyvinyl Alcohol ◽  
Room Temperature ◽  
Near Infrared ◽  
Deep Trap ◽  
Optical Absorption Spectroscopy ◽  
Band Edge Emission ◽  
Cdse Quantum Dots ◽  
Trap States ◽  
Transmission Electron

Polyvinyl alcohol-capped CdSe quantum dots, with a size within their quantum confinement limit, were prepared in aqueous solution at room temperature, by a simple and environmentally friendly chemical method. The size of the CdSe quantum dots was found to be dependent on the concentrations of the precursors of cadmium and selenium ions, as well as on the aging time and the reaction temperature; all of which could be used conveniently for tuning the size of the particles, as well as their optical properties. The synthesized quantum dots were characterized by optical absorption spectroscopy, fluorescence spectroscopy, X-ray diffraction, atomic force microscopy and transmission electron microscopy. The samples were fluorescent at room temperature; the green fluorescence was assigned to band edge emission, and the near-infrared fluorescence peaks at about 665 and 865 nm were assigned to shallow and deep trap states emissions, respectively. The quantum dots were fairly stable up to several days.

Synthesis of Mixed TiO2-Rare Earth Up-Conversion Material and Application in the Dye-Sensitized Solar Cells

2013 ◽  
Vol 724-725 ◽  
pp. 89-92
Author(s):  
Fang Xue ◽  
Jun Zhang ◽  
Ya Han Wu ◽  
Xiu Fang Wang ◽  
Na Liu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Rare Earth ◽  
Dye Sensitized Solar Cells ◽  
Photoelectric Conversion Efficiency ◽  
Rare Earth Ion ◽  
Photoelectric Conversion ◽  
Dye Sensitized ◽  
Transmission Electron ◽  
Sensitized Solar Cells ◽  
Heterogeneous Layer

Rare earth ion-doped nanoparticles NaYF4:Yb3+,Ho3+ is one of the most efficient up-conversion nanosystems, when mixing a TiO2 heterogeneous layer outside can extends the range of NaYF4:Yb3+,Ho3+ nanoparticles absorb solar energy. In this work, a multi-functional mixed NaYF4:Yb3+,Ho3+-TiO2 structure was synthesized. The micromorphology, structure and particle size of the up-converting nanoparticles were characterized by transmission electron microscopy (TEM), and room temperature up-conversion luminescence (UCL) spectrofluorimetric measurements. The mixture of NaYF4:Yb3+,Ho3+ and TiO2 nanoparticles was applied to Dye-sensitized solar cells (DSSCs), the photoelectric conversion efficiency of the DSSC with up-conversion material is nearly twice as much as of the control DSSC irradiated by infrared (IR) light.

Investigations on Hydrothermally Prepared Tin Mono-Sulphide Nanoparticles

2017 ◽  
Vol 17 ◽  
pp. 79-87 ◽  
Author(s):  
L. Ansel Mely ◽  
P. Annie Vinosha ◽  
M. Mary Jaculine ◽  
D.J. Vidhya Raj ◽  
K. Raja ◽  
...  
Keyword(s):  
Band Gap ◽  
Near Infrared ◽  
Hydrothermal Reaction ◽  
Scientific Information ◽  
Optical Absorption Coefficient ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Tin Chloride ◽  
Transmission Electron ◽  
Direct Band

Optically active, tin mono-sulphide (SnS) nanoparticles, having generic name herzenbergite, being one of the narrow band gap IV–VI semiconductors, geared up recently the attention of material scientists for its applications in photovoltaics, near-infrared detectors, and biomedical applications where strong scientific information on infrared absorption is required. Among the class of chalcopyrite semiconductors, SnS is a relatively inexpensive and non-toxic material with the nature of resource abundance for solar cell applications, having a bulk direct band gap of 1.3 eV and indirect bandgap of 1.1 eV, possessing high figure of merit such as optimum optical band gap, high optical absorption coefficient for photons and high photoelectric conversion efficiency of up to 25%. In the present work, nanostructured SnS particles of 11.75 nm were synthesized by means of a cinch hydrothermal reaction using the reagents tin chloride pentahydrate and thiourea at 200°C. The crystallinity, purity, morphology, and structural featuresof as-prepared nanoparticles were characterized by Powder X-ray Diffraction (XRD), Transmission Electron Microscope (TEM), UV-visible spectroscopy (Uv-vis), Photoluminescence spectroscopy (PL) and Fourier Transform Infra-red Spectroscopy (FTIR). XRD measurements reveal the formation of well-crystallized orthorhombic tin mono-sulphide nanoparticles which may be considered as a distorted NaCl structure. TEM observations demonstrate the morphology of the nanoparticles. The FTIR examination confirmed the existence of the vital functional groups. Absorption spectrum showed that the nanoparticles have an extensive absorption array. The optical properties determined by Uv-vis and PL measurements show that the prepared SnS nanoparticles will be an ideal candidate for photovoltaic applications.

Visible to Near-Infrared Photoelectric Conversion in a Dye-Sensitized Solar Cell Using Ru(II) Porphyrin with Azopyridine Axial Ligands

2012 ◽  
Vol 51 (10S) ◽  
pp. 10NE02 ◽  
Author(s):  
Takumi Kinoshita ◽  
Jun-ichi Fujisawa ◽  
Jotaro Nakazaki ◽  
Satoshi Uchida ◽  
Takaya Kubo ◽  
...  
Keyword(s):  
Solar Cell ◽  
Near Infrared ◽  
Dye Sensitized Solar Cell ◽  
Photoelectric Conversion ◽  
Dye Sensitized ◽  
Axial Ligands
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