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Annkatrin Lennert, Michelle Sternberg, Karsten Meyer, Rubén D Costa, Dirk M Guldi
In the current work, novel symmetrically alkyl-substituted imidazolium-based ionic liquids have been synthesized featuring either iodide (I(-)) or selenocyanate (SeCN(-)) as counteranions. Physicochemical assays based on spectroscopy and electrochemistry techniques have been performed to identify the best ionic liquid for application as electrolytes in quasi-solid-state dye-sensitized solar cells (qssDSSC). The latter were mixed with additives such as 4-tert-butylpyridine (4tbpy) and guanidinium thiocyanate (GuSCN) to optimize electrode surface coverage, ionic diffusion, and dye regeneration...
April 27, 2017: ACS Applied Materials & Interfaces
Nalaka P Liyanage, Hammad Cheema, Alexandra R Baumann, Alexa R Zylstra, Jared Heath Delcamp
NIR absorbing organic dyes are critically needed in dye-sensitized solar cells (DSCs). Thieno[3,4-b]pyrazine (TPz) based dyes can access the near-infrared (NIR) spectral region and show power conversion efficiencies (PCEs) of up to 8.1% with sunlight being converted at wavelengths up to 800 nm for 17.6 mA/cm2 of photocurrent in a co-sensitized DSC device. Precisely controlling dye excited-state energies is critical for good performances in NIR DSCs. Strategies to control TPz dye energetics with stronger donor groups and TPz substituent choice are evaluated in this manuscript...
April 25, 2017: ChemSusChem
Luca Passoni, Francesco Fumagalli, Andrea Perego, Sebastiano Bellani, Piero Mazzolini, Fabio di Fonzo
Monolithic dye sensitized solar cell architectures hold great potential for building integrated photovoltaics applications. They indeed benefit from lower weight and manufacturing costs as they avoid the use of a transparent conductive oxide coated glass counter electrode. In this work a transparent monolithic dye-sensitized solar cell comprising hierarchical 1D nanostructures stack is fabricated by physical vapour deposition techniques. The proof of concept device comprises hyperbranched TiO<sub>2 </sub> nanostructures, sensitized by the prototypical N719, as photoanode, a hierarchical nanoporous Al<sub>2 </sub>O<sub>3 </sub> spacer and a microporous ITO top electrode...
April 25, 2017: Nanotechnology
Gibum Kwon, Divya Panchanathan, Seyed Reza Mahmoudi, Mohammed A Gondal, Gareth H McKinley, Kripa K Varanasi
Photoresponsive titania surfaces are of great interest due to their unique wettability change upon ultraviolet light illumination. However, their applications are often limited either by the inability to respond to visible light or the need for special treatment to recover the original wettability. Sensitizing TiO2 surfaces with visible light-absorbing materials has been utilized in photovoltaic applications. Here we demonstrate that a dye-sensitized TiO2 surface can selectively change the wettability towards contacting liquids upon visible light illumination due to a photo-induced voltage across the liquid and the underlying surface...
April 25, 2017: Nature Communications
Qunwei Tang, Min Wang, Zhongling Wang, Weiyin Sun, Ruoxu Shang
An all-weather quasi-solid-state dye-sensitized solar cell is built using a long persistence phosphor tailored mesoscopic TiO2 photoanode and a three-dimensional conducting polymer gel electrolyte. The so-called all-weather solar cell yields a maximum efficiency of 28.7% in the dark, making a promising photovoltaic revolutionary for state-of-the-art photovoltaics.
April 18, 2017: Chemical Communications: Chem Comm
Fabrice Odobel, Yoann Farre, Mahfoudh Raissi, Arnaud Fihey, Yann Pellegrin, Errol Blart, Denis Jacquemin
We have prepared a series of four new diketopyrrolopyrroles (DPPs) based sensitizers that exhibit high molar extinction coefficients, extended absorption into the long wavelengths and well suited photoredox properties to act as sensitizers in p-DSSCs. These new DPP dyes, composed of a thienyl DPP core, are substituted on one end either by a thiophene carboxylic (Th) or a 4,4'-((phenyl)aza)dibenzoic acid as anchoring group and, on the other extremity, either by a proton or a naphthalene diimide (NDI) moiety...
April 14, 2017: ChemSusChem
Pooya Tahay, Meisam Babapour Gol Afshani, Ali Alavi, Zahra Parsa, Nasser Safari
In order to provide a comprehensive investigation of TiO2 nanoparticle size in relation with different dye types in DSSCs, three sizes of TiO2 nanoparticles and two different dye types including a porphyrin dye (T2) and a ruthenium dye (N3) were synthesized. Steady state current-voltage (J-V) characteristics were investigated for the fabricated DSSCs and the results demonstrated that the optimum TiO2 nanoparticle size changed with the dye type. The obtained J-V data were interpreted by cyclic voltammetry, UV-visible absorption spectroscopy, BET measurement, DFT calculation, IPCE measurement and impedance spectroscopy...
April 12, 2017: Physical Chemistry Chemical Physics: PCCP
Andrea Paolella, Cyril Faure, Giovanni Bertoni, Sergio Marras, Abdelbast Guerfi, Ali Darwiche, Pierre Hovington, Basile Commarieu, Zhuoran Wang, Mirko Prato, Massimo Colombo, Simone Monaco, Wen Zhu, Zimin Feng, Ashok Vijh, Chandramohan George, George P Demopoulos, Michel Armand, Karim Zaghib
Recently, intensive efforts are dedicated to convert and store the solar energy in a single device. Herein, dye-synthesized solar cell technology is combined with lithium-ion materials to investigate light-assisted battery charging. In particular we report the direct photo-oxidation of lithium iron phosphate nanocrystals in the presence of a dye as a hybrid photo-cathode in a two-electrode system, with lithium metal as anode and lithium hexafluorophosphate in carbonate-based electrolyte; a configuration corresponding to lithium ion battery charging...
April 10, 2017: Nature Communications
Chia-Yuan Chen, Zih-Hong Jian, Shih-Han Huang, Kun-Mu Lee, Ming-Hsuan Kao, Chang-Hong Shen, Jia-Min Shieh, Chin-Li Wang, Chiung-Wen Chang, Bo-Zhi Lin, Ching-Yao Lin, Ting-Kuang Chang, Yun Chi, Cheng-Yu Chi, Wei-Ting Wang, Yian Tai, Ming-De Lu, Yung-Liang Tung, Po-Ting Chou, Wen-Ti Wu, Tahsin J Chow, Peter Chen, Xiang-Hao Luo, Yuh-Lang Lee, Chih-Chung Wu, Chih-Ming Chen, Chen-Yu Yeh, Miao-Syuan Fan, Jia-De Peng, Kuo-Chuan Ho, Yu-Nan Liu, Hsiao-Yi Lee, Chien-Yu Chen, Hao-Wu Lin, Chia-Te Yen, Yu-Ching Huang, Cheng-Si Tsao, Yu-Chien Ting, Tzu-Chien Wei, Chun-Guey Wu
Indoor utilization of emerging photovoltaics is promising; however, efficiency characterization under room lighting is challenging. We report the first round-robin interlaboratory study of performance measurement for dye-sensitized photovoltaics (cells and mini-modules) and one silicon solar cell under a fluorescent dim light. Among 15 research groups, the relative deviation in power conversion efficiency (PCE) of the samples reaches an unprecedented 152%. On the basis of the comprehensive results, the gap between photometry and radiometry measurements and the response of devices to the dim illumination are identified as critical obstacles to the correct PCE...
April 20, 2017: Journal of Physical Chemistry Letters
Jiung-Huai Huang, Po-Han Lin, Wei-Ming Li, Kun-Mu Lee, Ching-Yuan Liu
A variety of D-pi-A type functional organic dyes have been facilely synthesized via direct C-H arylations using inexpensive copper salts as catalyst. Under well-optimized reaction conditions, a broad substrate scope with good functional group compatibility was achieved. Based on this synthetic strategy, we designed and prepared three new dye sensitizers (CYL-5~7) that were fabricated as dye-sensitized solar cells (DSSCs). Photovoltaic characterizations showed that these devices gave a Voc of 0.65~0.75 V, a Jsc of 5...
March 31, 2017: ChemSusChem
Luca D'Amario, Roger Jiang, Ute B Cappel, Elizabeth A Gibson, Gerrit Boschloo, Håkan Rensmo, Licheng Sun, Leif Hammarström, Haining Tian
The most common material for dye-sensitized photocathodes is mesoporous NiO. We transformed the usual brownish NiO to be more transparent by reducing high valence Ni impurities. Two pretreatment methods have been used: chemical reduction by NaBH4 and thermal reduction by heating. The power conversion efficiency of the cell was increased by 33% through chemical treatment, and an increase in open-circuit voltage from 105 to 225 mV was obtained upon heat treatment. By optical spectroelectrochemistry, we could identify two species with characteristically different spectra assigned to Ni(3+) and Ni(4+)...
April 3, 2017: ACS Applied Materials & Interfaces
Siva Sankar Nemala, Purnendu Kartikay, Sateesh Prathapani, H L Mallika Bohm, Parag Bhargava, Sivasambu Bohm, Sudhanshu Mallick
Graphene nanoplatelets (GNPs) are prepared from natural graphite by a simple and low-cost liquid phase high shear exfoliation method. The as-prepared GNPs are used as a counter electrode (CE) material for dye-sensitized solar cells (DSSCs). To confirm the Exfoliated GNPs, structural and morphological studies are carried out using X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and selected area electron diffraction (SAED) studies. The electrochemical behaviour of GNPs as a counter electrode material is evaluated and compared with standard Platinum (Pt) electrode using cyclic-voltammetry (CV) and electrochemical impedance spectroscopy (EIS)...
March 22, 2017: Journal of Colloid and Interface Science
Chun-Chang Wu, Wen-Yu Chuang, Ching-Da Wu, Yu-Cheng Su, Yung-Yang Huang, Yang-Jing Huang, Sheng-Yu Peng, Shih-An Yu, Chih-Ting Lin, Shey-Shi Lu
A self-sustained multi-sensor platform for indoor environmental monitoring is proposed in this paper. To reduce the cost and power consumption of the sensing platform, in the developed platform, organic materials of PEDOT:PSS and PEDOT:PSS/EB-PANI are used as the sensing films for humidity and CO₂ detection, respectively. Different from traditional gas sensors, these organic sensing films can operate at room temperature without heating processes or infrared transceivers so that the power consumption of the developed humidity and the CO₂ sensors can be as low as 10 μW and 5 μW, respectively...
March 29, 2017: Sensors
Beibei Xu, Yuanzuo Li, Peng Song, Fengcai Ma, Mengtao Sun
Three benzimidazole-based organic dyes, possessing the same triphenylamine donors and cyanoacrylic acid acceptors with the bithiophene π-bridges combined in different nuclear positions of benzimidazole, were investigated in the utility of dye-sensitizer solar cells. The structure, molecular orbital and energy, absorption spectra and some important parameters (such as light harvesting efficiency (LHE), electron injection driving force, the electron injection time, chemical reactivity parameters, vertical dipole moment as well as interaction models of dye-I2) were obtained according to Newns-Anderson model and DFT calculation...
March 28, 2017: Scientific Reports
Josh Baillargeon, Yuling Xie, Thomas W Hamann
A cobalt(IV/III) redox shuttle, cobalt tris(2-(p-tolyl)pyridine), [Co(ptpy)3](+/0), was synthesized and investigated for use in dye-sensitized solar cells, DSSCs. An incredibly fast self-exchange rate constant of (9.2 ± 3.9) × 10(8) M(-1) s(-1) was determined for [Co(ptpy)3](+/0), making it an ideal candidate for dye regeneration. To avoid fast recombination and solubility limitations, we utilized a tandem electrolyte containing [Co(ptpy)3](+/0) and cobalt tris(2,2'-bipyridine), [Co(bpy)3](3+/2+). An improved short circuit current density is achieved for DSSCs employing the tandem electrolyte, compared to electrolytes containing only [Co(bpy)3](3+/2+), consistent with superior dye regeneration expected based on predictions using Marcus theory, which is also discussed...
March 31, 2017: ACS Applied Materials & Interfaces
Palas Baran Pati, Lei Zhang, Bertrand Philippe, Ricardo Fernández-Terán, Sareh Ahmadi, Lei Tian, Håkan Rensmo, Leif Hammarström, Haining Tian
A covalently-linked organic dye-cobaloxime catalyst system is developed by facile click reaction for mechanistic studies and application in dye sensitized solar fuel device based on mesoporous NiO. This system has been systematically investigated by photoelectrochemical measurements, density functional theory, time resolved fluorescence, transient absorption spectroscopy as well as photoelectron spectroscopy. The results show that irradiation of the dye-catalyst on NiO leads to ultrafast hole injection into NiO from the excited dye, followed by a fast electron transfer process to reduce the catalyst...
March 24, 2017: ChemSusChem
Xiaotao Zheng, Weilin Chen, Li Chen, Yijing Wang, Xiangwei Guo, Jiabo Wang, Enbo Wang
Polyoxometalates (POM) have already been confirmed to act as effective electron-transfer mediators for improving the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs) based on previous studies. However, the improvement may be limited by the agglomeration of the polyoxoanions. In this paper, the previous synthesis strategy is improved upon by breaking the metal-organic frameworks (MOFs) with POMs as the secondary building units ([Ni(bpp)(H2 O)2 ]3 [P2 W18 O62 ]⋅24 H2 O (1) (bpp=1,3-bis(4-pyridyl)propane) and H6 [Cu3 (H2 O)6 (P2 W18 O62 )2 (3-dpye)6 ]⋅28 H2 O (2) (3-dpye=N,N'-bis(3-pyridinecarboxamide)-1,2-ethane)) to design and synthesize small sized and highly disperse POM nanoparticles by means of compositing with TiO2 , through calcination to remove the organic ligand...
March 24, 2017: Chemistry: a European Journal
Sofia Paulo, Emilio Palomares, Eugenia Martinez-Ferrero
Graphene and carbon quantum dots have extraordinary optical and electrical features because of their quantum confinement properties. This makes them attractive materials for applications in photovoltaic devices (PV). Their versatility has led to their being used as light harvesting materials or selective contacts, either for holes or electrons, in silicon quantum dot, polymer or dye-sensitized solar cells. In this review, we summarize the most common uses of both types of semiconducting materials and highlight the significant advances made in recent years due to the influence that synthetic materials have on final performance...
August 25, 2016: Nanomaterials
Guanying Chen, Zhijun Ning, Hans Ågren
We are glad to announce the Special Issue "Nanostructured Solar Cells", published in Nanomaterials. This issue consists of eight articles, two communications, and one review paper, covering major important aspects of nanostructured solar cells of varying types. From fundamental physicochemical investigations to technological advances, and from single junction solar cells (silicon solar cell, dye sensitized solar cell, quantum dots sensitized solar cell, and small molecule organic solar cell) to tandem multi-junction solar cells, all aspects are included and discussed in this issue to advance the use of nanotechnology to improve the performance of solar cells with reduced fabrication costs...
August 9, 2016: Nanomaterials
Guiru Sun, Liqun Sun, Haiming Xie, Jia Liu
With global concerns about the shortage of fossil fuels and environmental issues, the development of efficient and clean energy storage devices has been drastically accelerated. Nanofibers are used widely for energy storage devices due to their high surface areas and porosities. Electrospinning is a versatile and efficient fabrication method for nanofibers. In this review, we mainly focus on the application of electrospun nanofibers on energy storage, such as lithium batteries, fuel cells, dye-sensitized solar cells and supercapacitors...
July 2, 2016: Nanomaterials
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