scholarly journals On the photostability and luminescence of dye-sensitized upconverting nanoparticles using modified IR820 dyes

2022 ◽  
Author(s):  
Mannu Kaur ◽  
Gabrielle A. Mandl ◽  
Steven L. Maurizio ◽  
Gabriella Tessitore ◽  
John A. Capobianco
Keyword(s):  
Dye Molecules ◽  
Dye Sensitization ◽  
Dye Sensitized

Dye sensitization is a promising route to enhance luminescence from lanthanide-doped upconverting nanoparticles (LnUCNPs) by improving the photon harvesting capability of LnUCNPs through the use of dye molecules, characterized by...

scholarly journals The synthesis of novel BODIPY compounds for DSSC applications.

2021 ◽  
Author(s):  
Devin Douglas Machin
Keyword(s):  
Fine Tuning ◽  
Great Promise ◽  
Device Performance ◽  
Dye Molecules ◽  
Dye Sensitized ◽  
Redox Active ◽  
Boron Dipyrromethene ◽  
Photovoltaic Technologies ◽  
Active Donor ◽  
Dye Molecule

The dye-sensitized solar cell (DSSC) represents one of the most promising next-generation photovoltaic technologies. In addition, the DSSC manifold provides an exceptional platform to further appreciate photoinduced electron transfer and the fundamental features required for light-harvesting. The dye molecule is a key component in the DSSC and has achieved minor success utilizing both an organic and inorganic photosensitizers. DSSC’s show great promise owing to their inexpensive synthesis tunable optical and electrochemical properties, and a plethora of design possibilities. The typical anatomy of organic and inorganic DSSC dyes are comprised of a redox-active donor/chromophore (D) that is connected, through a conjugated linker (π), to an acceptor (A) capable of anchoring to titania (TiO2). Fine tuning each of these components can shift the absorption spectrum increasing the overall device efficiency. Boron-dipyrromethene (BODIPY) is an attractive moiety to integrate into DSSC dyes. BODIPY’s rigid organic framework should be able to improve dye stability while the high extinction coefficients of BODIPY based molecules have the potential to increase device performance. Herein, we explore the synthesis and physicochemical properties of BODIPY in an attempt to synthesize efficient DSSC dye molecules and efficient photovoltaic technologies.

Huge enhancement of upconversion luminescence by broadband dye sensitization of core/shell nanocrystals

2016 ◽  
Vol 45 (34) ◽  
pp. 13392-13398 ◽  
Author(s):  
Dongguang Yin ◽  
Yumin Liu ◽  
Jingxiu Tang ◽  
Feifei Zhao ◽  
Zhiwen Chen ◽  
...  
Keyword(s):  
Upconversion Luminescence ◽  
Core Shell ◽  
Dye Sensitization ◽  
Dye Sensitized

The UCL intensity of dye-sensitized UCNCs excited at 820 nm is 800-folds higher than that of pure UCNCs excited at 980 nm.

scholarly journals Interacting Ru(bpy) 3 2 + Dye Molecules and TiO2 Semiconductor in Dye-Sensitized Solar Cells

Mathematics ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 841 ◽  
Author(s):  
Sasipim Putthikorn ◽  
Thien Tran-Duc ◽  
Ngamta Thamwattana ◽  
James M. Hill ◽  
Duangkamon Baowan
Keyword(s):  
Solar Cells ◽  
Continuum Model ◽  
Minimum Energy ◽  
Dye Sensitized Solar Cells ◽  
Nanoporous Structure ◽  
Dye Molecules ◽  
Energy Position ◽  
Alternative Source ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Solar energy is an alternative source of energy that can be used to replace fossil fuels. Various types of solar cells have been developed to harvest this seemingly endless supply of energy, leading to the construction of solar cell devices, such as dye-sensitized solar cells. An important factor that affects energy conversion efficiency of dye-sensitized solar cells is the distribution of dye molecules within the porous semiconductor (TiO 2 ). In this paper, we formulate a continuum model for the interaction between the dye molecule Tris(2,2 ′ -bipyridyl)ruthenium(II) (Ru(bpy) 3 2 + ) and titanium dioxide (TiO 2 ) semiconductor. We obtain the equilibrium position at the minimum energy position between the dye molecules and between the dye and TiO 2 nanoporous structure. Our main outcome is an analytical expression for the energy of the two molecules as a function of their sizes. We also show that the interaction energy obtained using the continuum model is in close agreement with molecular dynamics simulations.

scholarly journals Nanoparticulate Dye-Semiconductor Hybrid Materials Formed by Electrochemical Self-Assembly as Electrodes in Photoelectrochemical Cells

2009 ◽  
Vol 64 (7-8) ◽  
pp. 518-530 ◽  
Author(s):  
Kazuteru Nonomura ◽  
Thomas Loewenstein ◽  
Esther Michaelis ◽  
Peter Kunze ◽  
Manuela Schiek ◽  
...  
Keyword(s):  
Thin Films ◽  
Self Assembly ◽  
Electrical Characterization ◽  
Visible Spectrum ◽  
Zno Films ◽  
Semiconductor Surface ◽  
Dye Molecules ◽  
Kinetic Measurements ◽  
Porous Texture ◽  
Dye Sensitized

AbstractDye-sensitized zinc oxide thin films were prepared, characterized and optimized for applications as photoelectrochemically active electrodes. Conditions were established under which crystalline thin films of ZnO with a porous texture were formed by electrochemically induced crystallization controlled by structure-directing agents (SDA). Dye molecules were adsorbed either directly as SDA during this preparation step or, preferably, following desorption of a SDA. The external quantum efficiency (IPCE) could thereby be increased significantly. Particular emphasis was laid on dye molecules that absorb in the red part of the visible spectrum. Model experiments under ultrahigh vacuum (UHV) conditions with dye molecules adsorbed on defined crystal planes of single crystals aimed at a deeper understanding of the coupling of the chromophore electronic π-system within molecular aggregates and to the semiconductor surface. Detailed photoelectrochemical kinetic measurements were used to characterize and optimize the electrochemically prepared dye-sensitized ZnO films. Parallel electrical characterization in vacuum served to distinguish between contributions of charge transport within the ZnO semiconductor matrix and the ions of the electrolyte in the pore system of the electrode.

scholarly journals Comparative Study between Dye-Sensitized and CdS Quantum-Dots-Sensitized TiO2 Solar Cells Using Photoinduced Absorption Spectroscopy

2011 ◽  
Vol 2011 ◽  
pp. 1-5
Author(s):  
Idriss Bedja ◽  
Anders Hagfeldt
Keyword(s):  
Quantum Dots ◽  
Comparison Study ◽  
Dye Molecules ◽  
Cds Quantum Dots ◽  
Photoinduced Absorption ◽  
Dye Sensitized ◽  
Redox Electrolyte ◽  
Photoinduced Charge Separation ◽  
Millisecond Range ◽  
Photoinduced Charge

Two 8 μm thick TiO2 photoelectrodes have been sensitized separately by N719 dye molecules and CdS quantum dots for a comparison study. Photoinduced absorption (PIA) spectroscopy was employed to investigate the mechanistic properties of electrons under illumination conditions comparable to sunlight. The PIA spectrum of both electrodes (in the presence of electrolyte) is due to electrons in TiO2 and iodine radicals in the electrolyte. In the absence of redox electrolyte, both electrodes show long-lived photoinduced charge-separation with lifetime in a millisecond range (8.5 ms for Q-dot-sensitized TiO2 and 11.5 ms for dye-sensitized TiO2).

Heterodimerization at the dye sensitized TiO2 surface: an efficient strategy toward quick removal of water contaminants

2016 ◽  
Vol 15 (7) ◽  
pp. 920-927 ◽  
Author(s):  
Zaki S. Seddigi ◽  
Saleh A. Ahmed ◽  
Samim Sardar ◽  
Samir Kumar Pal
Keyword(s):  
Solar Light ◽  
Tio2 Surface ◽  
Dye Sensitization ◽  
Water Contaminants ◽  
Efficient Strategy ◽  
Dye Sensitized

Crucial dye sensitization of porous TiO2 MS for filtering pollutants through heterodimerization and their solar light mediated degradation via ROS are demonstrated.

scholarly journals Dye-sensitized Pt@TiO2 core–shell nanostructures for the efficient photocatalytic generation of hydrogen

2014 ◽  
Vol 5 ◽  
pp. 360-364 ◽  
Author(s):  
Jun Fang ◽  
Lisha Yin ◽  
Shaowen Cao ◽  
Yusen Liao ◽  
Can Xue
Keyword(s):  
Photocatalytic Activity ◽  
High Photocatalytic Activity ◽  
Shell Structures ◽  
Core Shell ◽  
Synergic Effect ◽  
Proton Reduction ◽  
Dye Sensitization ◽  
Dye Sensitized ◽  
Shell Nanostructures ◽  
Photogenerated Electrons

Pt@TiO2 core–shell nanostructures were prepared through a hydrothermal method. The dye-sensitization of these Pt@TiO2 core–shell structures allows for a high photocatalytic activity for the generation of hydrogen from proton reduction under visible-light irradiation. When the dyes and TiO2 were co-excited through the combination of two irradiation beams with different wavelengths, a synergic effect was observed, which led to a greatly enhanced H2 generation yield. This is attributed to the rational spatial distribution of the three components (dye, TiO2, Pt), and the vectored transport of photogenerated electrons from the dye to the Pt particles via the TiO2 particle bridge.

Dye-Sensitized Solar Cell Using Syzygium Cumini Fruit as Natural Dye Utilizing Titanium Dioxide

2015 ◽  
Vol 754-755 ◽  
pp. 1177-1181 ◽  
Author(s):  
Nor Azura Malini Ahmad Hambali ◽  
N. Roshidah Yusof ◽  
M. Norhafiz Hashim ◽  
Siti Salwa Mat Isa
Keyword(s):  
Titanium Dioxide ◽  
Solar Cells ◽  
Fill Factor ◽  
Dye Sensitized Solar Cells ◽  
Natural Dye ◽  
Syzygium Cumini ◽  
Dye Molecules ◽  
Dye Sensitized ◽  
Overall Performance ◽  
Sensitized Solar Cells

In this paper we present fabrication and experimental results to the field of dye-sensitized solar cells, more particularly relates to Syzygium cumini fruit dyes as sensitizers. A dyes molecule from Syzygium cumini fruit adsorbs to each particle of the titanium dioxide. A dyes molecules act as absorbance of the visible light. Simultaneously, titanium dioxide plays a role as griping and absorbs place for natural dye molecules. Thus, an important component for overall performance in term of efficiency for dye-sensitized solar cells is the photogeneration from the absorbed dye in titanium dioxide. The dye-sensitized solar cells fabricated with the extract of Syzygium cumini fruit dye produced fill factor of 0.317 and conversion efficiency of 2.0 %.

Impedance spectroscopy study of solid-state dye-sensitized solar cells with varying Spiro-OMeTAD concentration

2009 ◽  
Vol 1211 ◽  
Author(s):  
Márcio S Góes ◽  
Francisco Fabregat-Santiago ◽  
Paulo R Bueno ◽  
Juan Bisquert
Keyword(s):  
Solar Cells ◽  
Solid State ◽  
Dye Sensitized Solar Cells ◽  
Hole Transport ◽  
Dye Molecules ◽  
Dye Sensitized ◽  
Diode Ideality Factor ◽  
Impedance Spectroscopy Study ◽  
Sensitized Solar Cells ◽  
Current Potential

AbstractThis work reports on the changes of solid-state cells dye-sensitized solar cells performance with the variation of concentration of spiro-OMeTAD between 5% and 25% in the fabrication of the cell. The changes in charge recombination and capacitance correlate with the improvement of current-potential characteristics a increasing spiro-OMeTAD content, which is explained by reduction of transport resistance for hole transport, the increase of charge separation in the dye molecules, and importantly, with the increase of the β-factor in the recombination resistance, that causes a reduction of the diode ideality factor.

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