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.

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.

Efficeincy Improvement of Triphenylamine-Based Organic Dyes in DSSCs, An Effects of Linker Moiety

2013 ◽  
Vol 802 ◽  
pp. 257-261 ◽  
Author(s):  
Pakawat Chittratan ◽  
Prawonwan Thanakit ◽  
Wirat Jarernboon ◽  
Darinee Phromyothin
Keyword(s):  
Density Functional ◽  
Organic Dyes ◽  
Dye Sensitized Solar Cells ◽  
Dye Molecules ◽  
Functional Theory ◽  
Dye Sensitized ◽  
The Density Functional Theory ◽  
Sensitized Solar Cells ◽  
Bond Effect ◽  
Dye Molecule

Triphenylamine-base organic dyes were designed and investigated for dye-sensitized solar cells (DSSCs). The dye molecules consist of three parts, an electron-donor connected by the π-conjugated linker (benzene and thiophene) as an electron spacer and an acceptor/anchoring (cyanoacrylic acid). In this study, quantum chemical calculations were used to study the electronic properties, optical properties and density of electron in the linker of dye molecule by using the density functional theory. The results present that thiophene is the most appropriate to use as electron linker between triphenylamine donor and acrylic acceptor due to the wide of absorption band and π-conjugate bond effect on exhibiting red-shifted absorption spectra.

scholarly journals Novel Insights into the Pathogenesis and Prevention of Intradialytic Hypotension

2018 ◽  
Vol 45 (1-3) ◽  
pp. 230-235 ◽  
Author(s):  
Frank M. van der Sande ◽  
Marijke J.  Dekker ◽  
Karel M.L. Leunissen ◽  
Jeroen P. Kooman
Keyword(s):  
Tissue Perfusion ◽  
Organ Damage ◽  
Adverse Outcomes ◽  
Fine Tuning ◽  
Great Promise ◽  
Intradialytic Hypotension ◽  
Related Factors ◽  
Thermally Induced ◽  
Discontinuous Nature

Background: Intradialytic hypotension (IDH) is a common complication of haemodialysis (HD) and associated with adverse outcomes, especially when a nadir definition (systolic blood pressure <90 mm Hg) is used. The pathogenesis of IDH is directly linked to the discontinuous nature of the HD treatment, in combination with patient-related factors such as age, diabetes mellitus and cardiac failure. Summary: Although the decline in blood volume due to removal of fluid by ultrafiltration is the prime mover, thermally induced reflex vasodilation compromises the haemodynamic response to hypovolemia. Recent studies have stressed the relevance of changes in tissue perfusion during HD, which may translate in long-term organ damage. Monitoring changes in tissue perfusion, for which emerging evidence becomes available, appears to have great promise in the fine-tuning of the dialysis procedure. Key Messages: While it is unlikely that IDH can be completely prevented, reduction in inter-dialytic weight gain, prevention of an increase in core temperature by adjusting the dialysate temperature and more frequent or prolonged dialysis treatment remain cornerstones in providing a more comfortable and safe treatment.

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 Toward Current Matching in Tandem Dye-Sensitized Solar Cells

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2936
Author(s):  
Junfeng Wei ◽  
Zhipeng Shao ◽  
Bin Pan ◽  
Shuanghong Chen ◽  
Linhua Hu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Dye Sensitized ◽  
Current Matching ◽  
Current Densities ◽  
Experimental Findings ◽  
Photovoltaic Technologies ◽  
Sensitized Solar Cells

The tandem pn-type dye-sensitized solar cells (pn-DSCs) have received much attention in the field of photovoltaic technologies because of their great potential to overcome the Shockley-Queisser efficiency limitation that applies to single junction photovoltaic devices. However, factors governing the short-circuit current densities (Jsc) of pn-DSC remain unclear. It is typically believed that Jsc of the pn-DSC is limited to the highest one that the two independent photoelectrodes can achieve. In this paper, however, we found that the available Jsc of pn-DSC is always determined by the larger Jsc that the photoanode can achieve but not by the smaller one in the photocathode. Such experimental findings were verified by a simplified series circuit model, which shows that a breakdown will occur on the photocathode when the photocurrent goes considerably beyond its threshold voltage, thus leading to an abrupt increase in Jsc of the circuit. The simulation results also suggest that a higher photoconversion efficiency of the pn-DSCs can be only achieved when an almost equivalent photocurrent is achieved for the two photoelectrodes.

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.

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