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Leila Alibabaei, Robert J Dillon, Caroline E Reilly, M Kyle Brennaman, Kyung-Ryang Wee, Seth L Marquard, John M Papanikolas, Thomas J Meyer
Visible-light-driven water splitting was investigated in a dye sensitized photoelectrosynthesis cell (DSPEC) based on a photoanode with a phosphonic acid-derivatized donor--acceptor (D--A) organic chromophore, 1, and the water oxidation catalyst [Ru(bda)(4-O(CH2)3P(O3H2)2-pyr)2], 2, (pyr = pyridine; bda = 2,2'-bipyridine-6,6'-dicarboxylate). The photoanode was prepared by using a layering strategy beginning with the organic dye anchored to an FTO|core/shell electrode, atomic layer deposition (ALD) of a thin layer (< 1 nm) of TiO2, and catalyst binding through phosphonate linkage to the TiO2 layer...
October 16, 2017: ACS Applied Materials & Interfaces
Golnoush Zamiri, Samira Bagheri
Zero-dimensional graphene quantum dots (GQDs) consist of single- or few-layer graphene with a size less than 20 nm and stand for a new type of QDs with unique properties combining the graphene nature and size-resulted quantum effects. GQDs possess unique optical and electronic properties, and in particular possess a band-gap less than 2.0 eV because of quantum confinement and edge effects. In this study, we investigated the performance of DSSCs using different thicknesses of ZnO nanoparticles as a photo-anode and GQDs as a green photosensitizer...
October 7, 2017: Journal of Colloid and Interface Science
Yang Fan, Hua-Min Li, Rui-Huan Duan, Hai-Ting Lu, Jun-Tao Cao, Guo-Dong Zou, Qiang-Shan Jing
The metal-to-core charge transfer (MCCT) transition in sensitized titanium-oxo clusters is an important process for photoinduced electron injection in photovoltaic conversion. This process resembles most closely the Type II photoinjection in dye-sensitized solar cells. Herein we report the synthesis and photophysical and photoelectrochemical (PEC) properties of the phosphonate-stabilized titanium-oxo clusters containing the ferrocenecarboxylate ligands. These ferrocene-containing clusters exhibit intense visible absorption extended up to 600 nm along with low optical band gaps of ∼2...
October 13, 2017: Inorganic Chemistry
Saera Jin, Eunhye Shin, Jongin Hong
TiO₂ nanowire networks were prepared, using the corrosion of Ti foils in alkaline (potassium hydroxide, KOH) solution at different temperatures, and then a further ion-exchange process. The prepared nanostructures were characterized by field emission scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The wet corroded foils were utilized as the photoanodes of bendable dye-sensitized solar cells (DSSCs), which exhibited a power conversion efficiency of 1.11% under back illumination...
October 12, 2017: Nanomaterials
Michael S Eberhart, Degao Wang, Renato N Sampaio, Seth L Marquard, Bing Shan, M Kyle Brennaman, Gerald J Meyer, Christopher Dares, Thomas J Meyer
Organic chromophores can be synthesized by established methods and offer an opportunity to expand overall solar spectrum utilization for dye sensitized photoelectrosynthesis cells (DSPECs). However, there are complications in the use of organic chromophores arising from the instability of their oxidized forms, the inability of their oxidized forms to activate a water oxidation catalyst, or the absence of a sufficiently reducing excited state for electron injection into appropriate semiconductors. Three new triarylamine donor-acceptor organic dyes have been investigated here for visible light driven water oxidation...
October 12, 2017: Journal of the American Chemical Society
Hammad Cheema, Adithya Peddapuram, Rebecca E Adams, Louis E McNamara, Leigh Anna Hunt, Ngoc Le, Davita L Watkins, Nathan I Hammer, Russell H Schmehl, Jared H Delcamp
The thienopyrazine (TPz) building block allows for NIR photon absorption in dye-sensitized solar cells (DSCs) when used as a π-bridge. We have synthesized and characterized 7 organic sensitizers employing thienopyrazine (TPz) as a π-bridge in a double donor, double acceptor (DD-π-AA) organic dye design. Donor groups are varied based on electron donating strength and sterics at the donor-π bridge bond with the acceptor groups varied as either carboxylic acids or benzoic acids on the π-bridge. This dye design was found to be remarkably tunable with solution absorption onsets ranging from 750 nm to near 1000 nm...
October 12, 2017: Journal of Organic Chemistry
Sujin Baek, Su-Jin Ha, Heechul Lee, Kiwon Kim, Dongchoul Kim, Jun Hyuk Moon
The transparent characteristic of dye-sensitized solar cells (DSCs) makes them suitable for building integrated photovoltaic (BIPV) devices. However, the diffusive scattering layer, which is usually used to increase the efficiency of these devices, greatly lowers the transparency of the DSC. This paper described a two-dimensional (2D) photonic crystal (PC) reflector with a sub-micrometer characteristic length that can improve the efficiency of these devices while maintaining transparency. This 2D PCs were fabricated directly onto TiO2 photoelectrodes using colloidal lithography and have the structure of a nanopillar array...
October 12, 2017: ACS Applied Materials & Interfaces
Assia Bourouina, Mâammar Rekhis
Ruthenium-based molecules have proven their efficiency as photosensitizers in dye-sensitized solar cells. However, due to the high cost and scarcity of this noble metal, in this work we investigated the effects of replacing the ruthenium in photosensitizers with iron because it is less expensive and more abundant. DFT and TD-DFT methods were used to explore the resulting systems. The B3LYP functional was employed to compute the ground-state geometries and the frontier molecular orbitals for four complexes of general formula M(Rbpy)2S2N2C2 (M = Ru or Fe; R = COOH or COOEt)...
October 12, 2017: Journal of Molecular Modeling
Sadig Aghazada, Yameng Ren, Peng Wang, Mohammad Khaja Nazeeruddin
Three new tris-heteroleptic complexes of ruthenium(II) were designed by coordinating the metal center with cyclometalating, anchoring, and auxiliary ligands with different donor substituents. N-Hexylcarbazole, N-hexylphenothiazine, and N-hexyldiphenylamine donor moieties were used as substituents on the auxiliary ligands for SA633, SA634, and SA635, respectively. Complexes were characterized by (1)H and (13)C 2D-COSY NMR techniques. These complexes provide power conversion efficiencies in the range of 7.6-8...
October 11, 2017: Inorganic Chemistry
Suri Babu Akula, Huei-Siou Chen, Chaochin Su, Bo-Ren Chen, Jiunn-Jie Chiou, Chia-Hsuan Shieh, Ya-Fen Lin, Wen-Ren Li
We report the synthesis, characterization, and photovoltaic properties of four ruthenium complexes (CI101, CBTR, CB111, and CB108) having various N-heterocyclic carbene ancillary ligands, pyridine-imidazole, -benzimidazole, -dithienobenzimidazole, and -phenanthroimidazole, respectively. These complexes were designed to investigate the effect of extended conjugation ordained from ring fusion on the power conversion efficiencies of the solar cells. The device sensitized by CB108, the pyridine-phenanthroimidazole conjugated complex, showed an improved efficiency (9...
October 11, 2017: Inorganic Chemistry
Jayraj V Vaghasiya, Keval K Sonigara, Thomas Beuvier, Alain Gibaud, Saurabh S Soni
A novel saturated heterocyclic organic ionic crystal, piperidinium iodide (PiHI), is synthesized by a facile route and applied as a solid electrolyte in Dye Sensitized Solar Cells (ss-DSSCs). Upon addition of a small quantity of iodine, PiHI self-assembles into a 1D lamellar micro crystalline structure that shows anisotropic conductivity. The two-component PiHI was characterized by using electrochemical impedance spectroscopy, cyclic voltammetry, steady state voltammetry, FT-IR, and Raman spectroscopy. Wide angle X-ray diffraction (XRD) measurement confirms the presence of long range 1D lamellar channels that pave the way for the diffusion of the redox couple I(-)/I3(-) and exhibit high anisotropic conductivity...
October 11, 2017: Nanoscale
Xiuwen Wang, Ying Xie, Buhe Bateer, Kai Pan, Yanqing Jiao, Ni Xiong, Song Wang, Honggang Fu
Cu2ZnSnS4 (CZTS) and Cu2ZnSn(S, Se)4 (CZTSSe) as promising photovoltaic materials have drawn much attention because they are environmentally benign and earth abundant elements. In this work, the monodispersed, low-cost Cu2ZnSnS4 nanocrystals with small size have been controllably synthesized via a wet chemical routine. And CZTSSe could be easily prepared after selenization of CZTS. When they are employed as counter electrodes (CEs) for dye-sensitized solar cells (DSSCs), the power conversion efficiency (PCE) has been improved from 3...
October 11, 2017: ACS Applied Materials & Interfaces
Federico Bella, Jelena Popovic, Andrea Lamberti, Elena Tresso, Claudio Gerbaldi, Joachim Maier
With the purpose of achieving stable dye-sensitized solar cells (DSSCs) with high efficiency, a new type of soft matter electrolyte is tested in which specific amounts of nanosized silica particles are finely dispersed in short-chained polyethylene glycol dimethylether encompassing iodide/triiodide redox mediator. It results in a solid-liquid composite having synergistic electrical and favorable mechanical properties. The combination of interfacial effects and particle network formation promotes enhanced ion transport, which directly impacts the short-circuit photocurrent density...
October 10, 2017: ACS Applied Materials & Interfaces
Hsien-Hsin Chou, Yu-Chieh Liu, Guanjie Fang, Qiao-Kai Cao, Tzu-Chien Wei, Chen-Yu Yeh
The need for low-cost and highly efficient dyes for dye-sensitized solar cells under both the sunlight and dim light environments is growing. We have devised GJ-series push-pull organic dyes which require only four synthetic steps. These dyes feature a linear molecular structure of donor-perylene-ethynylene-arylcarboxylic acid where donor represents N,N-diarylamino group and arylcarboxylic groups represents benzoic, thienocarboxylic, 2-cyano-3-phenylacrylic, 2-cyano-3-thienoacrylic and 4-benzo[c][1,2,5]thiadiazol-4-yl-benzoic groups...
October 9, 2017: ACS Applied Materials & Interfaces
Chang Liu, Elena Jakubikova
Interfacial electron transfer (IET) is one of the crucial steps in the light-harvesting process that occurs in various assemblies for solar energy conversion, such as dye-sensitized solar cells or dye-sensitized photoelectrosynthesis cells. Computational studies of IET in dye-semiconductor assemblies employ a variety of approaches, ranging from phenomenological models such as Fermi's golden rule to more complex methods relying on explicit solutions of the time-dependent Schrödinger equation. This work investigates IET in a model pyridine-TiO2 assembly, with the goals of assessing the validity of Fermi's golden rule for calculation of the IET rates, understanding the importance of conformational sampling in modeling the IET process, and establishing an approach to rapid computational screening of dye-sensitizers that undergo fast IET into the semiconductor...
September 1, 2017: Chemical Science
Paola Guarracino, Teresa Gatti, Nicolò Canever, Mustapha Abdu-Aguye, Maria Antonietta Loi, Enzo Menna, Lorenzo Franco
We investigated the photophysical properties of a newly synthesized hybrid material composed of a triphenylamine dye covalently bound to reduced graphene oxide, potentially relevant as a stable photosensitizer in dye-sensitized solar cells. The photophysical characterization has been carried out by means of fluorescence quenching and fluorescence lifetime measurements, complemented by Electron Paramagnetic Resonance (EPR) spectroscopy, aimed at the detailed description of the photoinduced processes occurring in the hybrid and in the mixed hybrid/N-doped TiO2 material...
October 18, 2017: Physical Chemistry Chemical Physics: PCCP
Mosè Casalegno, Guido Raos, Giovanni Battista Appetecchi, Stefano Passerini, Franca Castiglione, Andrea Mele
Knowledge of the ion motion in room temperature ionic liquids (RTILs) is critical for their applications in a number of fields, from lithium batteries to dye-sensitized solar cells. Experiments on a limited number of RTILs have shown that on macroscopic time scales the ions typically undergo conventional, Gaussian diffusion. On shorter time scales, however, non-Gaussian behavior has been observed, similar to supercooled fluids, concentrated colloidal suspensions, and more complex systems. Here we characterize the diffusive motion of ionic liquids based on the N-butyl-N-methylpyrrolidinium (PYR14) cation and bis(trifluoro methanesulfonyl)imide (TFSI) or bis(fluorosulfonyl)imide (FSI) anions...
October 10, 2017: Journal of Physical Chemistry Letters
Zahra Hosseini, Nima Taghavinia, Eric Wei-Guang Diau
Relative to the broad-band solar spectrum, a narrow range of spectral absorption of photovoltaic (PV) devices is considered an important reason for the efficiency of harvesting light of these devices being less than unity. Having the narrowest spectral response to solar radiation among all PV devices, a dye-sensitized solar cell (DSSC) suffers severely from this loss. Luminescent spectral conversion provides a mechanism to manipulate and to adapt the incident solar spectrum through converting solar photons into energies that are more effectively captured by a PV device through photoluminescence...
October 3, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Guosheng Yang, Yunyu Tang, Xin Li, Hans Ågren, Yongshu Xie
Donor-π-acceptor-type porphyrin dyes have been widely used for the fabrication of efficient dye-sensitized solar cells (DSSCs) owing to their strong absorption in the visible region and the ease of modifying their chemical structures and photovoltaic behavior. On the basis of our previously reported efficient porphyrin dye XW11, which contains a phenothiazine-based electron donor, a π-extending ethynylene unit, and an auxiliary benzothiadiazole acceptor, we herein report the syntheses of novel porphyrin dyes XW26-XW28 by introducing one or two alkyl/alkoxy chains into the auxiliary acceptor...
October 11, 2017: ACS Applied Materials & Interfaces
Daniel Iglesias, Pedro Atienzar, Ester Vázquez, María Antonia Herrero, Hermenegildo García
A series of carbon nanohorns (CNHs) constituted by the aggregation of about 2000 individual conical graphene tubes (diameters from 2 nm to 5 nm and a length of 40-50 nm) that have been modified with dyes of two, three, or four terthienyl groups has been prepared by adsorbing the corresponding dye on the CNH. Persistent inks in o-dichlorobenzene (o-DCB) of these dye-CNH conjugates were obtained by laser irradiation of o-DCB suspensions of the dye-CNH solids. These inks were used in combination or not with N719 dye for the preparation of dye-sensitized solar cells (DSSC) of TiO₂...
September 25, 2017: Nanomaterials
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