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Cai-Rong Zhang, Xing-Yu Li, Yu-Lin Shen, Youzhi Wu, Zi-Jiang Liu, Hongshan Chen
Novel dye sensitizers are highly expected in the development of dye-sensitized solar cells (DSSCs) since dye sensitizers can significantly affect the power conversion efficiency (PCE). Here, the molecular docking strategy is applied to design panchromatic dye sensitizers for DSSCs in order to improve light-harvesting efficiency covering the full solar spectrum. Considering the broad absorption bands of tetraanthracenylporphyrins (TAnPs) and tetraazuleneporphyrins (TAzPs), based upon porphyrin dye sensitizer YD2-o-C8, the panchromatic dye sensitizers coded as H2(TAnP)-α, H2(TAzP)-γ, H2(TAzP)-ε, and H2(TAzP)-δ are designed by the substitution of the porphyrin-ring in YD2-o-C8 with TAnPs and TAzPs moieties at different positions...
March 20, 2017: Journal of Physical Chemistry. A
Oliver Langmar, Davide Saccone, Anna Amat, Simona Fantacci, Guido Viscardi, Claudia Barolo, Ruben Costa, Dirk Michael Guldi
Herein, the synthesis of a novel family of squaraines (SQ) and their application in p-type dye-sensitized solar cells (DSSC) is presented. In particular, two sets of SQs were designed. The SQs have been characterized by using a joint theoretical, photophysical and electrochemical approach. Importantly, the presence of different central groups forces them into a frozen cis (dicyanovinyl group) or a trans (oxygen group) conformation. Based on the latter, the current work enables the direct comparison between cis and trans isomers, as well as the impact of a different number of anchors...
March 20, 2017: ChemSusChem
Laura A Büldt, Oliver S Wenger
Group 6 d6 metal complexes with arylisocyanide ligands are earth-abundant alternatives to photoactive complexes made from precious metals such as Ru(II), Re(I), Os(II), or Ir(III). Some of them have long-lived 3MLCT excited states that exhibit luminescence with good quantum yields combined with nano- to microsecond lifetimes, and they are very strongly reducing. Recent studies have demonstrated that Cr(0), Mo(0), and W(0) arylisocyanides have great potential for application in luminescent devices, photoredox catalysis, and dye-sensitized solar cells...
March 20, 2017: Angewandte Chemie
Sumit Chaurasia, Chun Ting Li, Mulu Berhe Desta, Jen Shyang Ni, Jiann T Lin
A new series of benzimidazole (BIm) based dyes (SC32 and SC33) and pyridoimidazole (PIm) based dyes (SC35 and SC36) were synthesized as the sensitizers for dye-sensitized solar cells. The N-substituent and C-substituent at the BIm and PIm cores was found to be the dominating factor in deciding the electronic properties of the dyes and their DSSCs performance. The efficiency of BIm-based dyes (SC35 and SC36) was found higher than the BIm-based dyes (SC32 and SC33) due to better light harvesting. The C-substituent in SC36, 4-hexylloxybenzene, is beneficial to dark current suppression, and hence SC36 achieves the best efficiency of 7...
March 16, 2017: Chemistry, An Asian Journal
Ramesh Maragani, Rajneesh Misra, M S Roy, Manish Kumar Singh, Ganesh D Sharma
We have designed and synthesized ferrocenyl (donor) bisthiazole linked triphenylamine (donor) based donor-π-acceptor-π-donor-acceptor (D-π-A)2-π-D-A type dyes D1 and D2 by using Pd-catalyzed Sonogashira cross-coupling and Knoevenagel condensation reactions. Their photophysical, electrochemical and computational studies reveal strong donor-acceptor interaction. Dye sensitized solar cells (DSSCs) based on D1 and D2 exhibit power conversion efficiencies (PCE) of 6.33% and 5.03%, respectively. The higher PCE value of the D1 based DSSC is attributed to its enhanced short-circuit current (Jsc) and open-circuit current (Voc) and fill factor (FF) values because of the strong binding of the anchoring cyanoacrylic acid with the TiO2 surface as compared to the dicyanovinyl unit in D2...
March 16, 2017: Physical Chemistry Chemical Physics: PCCP
Jin Soo Kang, Jin Kim, Myeong Jae Lee, Yoon Jun Son, Juwon Jeong, Dong Young Chung, Ahyoun Lim, Heeman Choe, Hyun S Park, Yung-Eun Sung
Photoelectrochemical (PEC) cells are promising tools for renewable and sustainable solar energy conversion. Currently, their inadequate performance and high cost of the noble metals used in the electrocatalytic counter electrode have postponed the practical use of PEC cells. In this study, we report the electrochemical synthesis of nanoporous tungsten carbide and its application as a reduction catalyst in PEC cells, namely, dye-sensitized solar cells (DSCs) and PEC water splitting cells, for the first time...
March 16, 2017: Nanoscale
Chenle Zhang, Libo Deng, Peixin Zhang, Xiangzhong Ren, Yongliang Li, Tingshu He
The performance of a dye-sensitized solar cell (DSSC) is strongly influenced by the catalytic performance of its counter electrode (CE) materials. Platinum (Pt) is conventionally used as the CE for DSSCs, but it is precious and is readily corroded by the iodide/triiodide electrolyte. Herein, mesoporous NiCo2O4 networks with different types of building blocks were prepared by electrospinning of a composite solution followed by annealing in air, and their performances as CEs in DSSCs were investigated. The honeycomb-like NiCo2O4 exhibited better performance than the nanotube ones, showing a photoelectric conversion efficiency of 7...
March 14, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Zhitong Jin, Meirong Zhang, Min Wang, Chuanqi Feng, Zhong-Sheng Wang
Solar energy is the most abundant renewable energy available to the earth and can meet the energy needs of humankind, but efficient conversion of solar energy to electricity is an urgent issue of scientific research. As the third-generation photovoltaic technology, dye-sensitized solar cells (DSSCs) have gained great attention since the landmark efficiency of ∼7% reported by O'Regan and Grätzel. The most attractive features of DSSCs include low cost, simple manufacturing processes, medium-purity materials, and theoretically high power conversion efficiencies...
March 10, 2017: Accounts of Chemical Research
Dong-Il Won, Jong-Su Lee, Ha-Yeon Cheong, Minji Cho, Won-Jo Jung, Ho-Jin Son, Chyongjin Pac, Sang Ook Kang
Efficient hybrid photocatalysts for carbon dioxide reduction were developed from dye-sensitized TiO2 nanoparticles and their catalytic performance was optimized by ternary organic/inorganic components. Thus, the hybrid system consists of (E)-2-cyano-3-(5'-(5''-(p-(diphenylamino)phenyl)thiophen-2''-yl)thiophen-2'-yl)-acrylic acid as a sensitizer and fac-[Re(4,4'-bis(diethoxyphosphorylmethyl)-2,2'-bipyridine)(CO)3Cl] as a reduction catalyst (ReP), both of which have been fixed onto TiO2 semiconductors (s-TiO2, h-TiO2, d-TiO2)...
March 9, 2017: Faraday Discussions
Yan-Syun Ciou, Po-Han Lin, Wei-Ming Li, Kun-Mu Lee, Ching-Yuan Liu
A variety of push-pull type organic dyes are facilely synthesized through the most atom-economical C-H/C-H dehydrogenative coupling reactions. After comprehensive synthetic optimizations, a broad substrate scope is achieved and functional groups such as ester, ketone, nitrile, nitro, and triazene are well tolerated. The sensitive aldehyde group required for the conversion into anchoring groups for DSSCs applications is also compatible under present oxidant-containing reaction conditions. Based on this optimum C-H/C-H coupling approach, three new organic sensitizers are readily prepared and submitted to solar cell device fabrications, giving the power conversion efficiency (PCE) up to 4...
March 7, 2017: Journal of Organic Chemistry
Subha Sadhu, Preeti Gupta, Pankaj Poddar
In comparison to the one dimensional (1D) semiconductor nanostructures, the hierarchical, three-dimensional (3D) microstructures, composed of the arrays of 1D nanostructures as the building blocks, show quite unique physicochemical properties due to efficient photon capture, enhanced surface to volume ratio, which aid to improve the performance of various optoelectronic devices. In this contribution, we report the fabrication of surfactant-free, radially-assembled, 3D titania (rutile phase) microsphere arrays (3D-TMSAs) composed of bundles of single-crystalline titania nanowires (NWs) directly on fluorine-dope conducting oxide (FTO) substrates with tunable architecture...
March 6, 2017: ACS Applied Materials & Interfaces
Fiona A Black, Charlotte A Clark, Gareth H Summers, Ian P Clark, Michael Towrie, Thomas Penfold, Michael W George, Elizabeth A Gibson
Understanding what influences the formation and lifetime of charge-separated states is key to developing photoelectrochemical devices. This paper describes the use of time-resolved infrared absorption spectroscopy (TRIR) to determine the structure and lifetime of the intermediates formed on photoexcitation of two organic donor-π-acceptor dyes adsorbed to the surface of NiO. The donor and π-linker of both dyes is triphenylamine and thiophene but the acceptors differ, maleonitrile (1) and bodipy (2). Despite their structural similarities, dye 1 outperforms 2 significantly in devices...
March 6, 2017: Physical Chemistry Chemical Physics: PCCP
Alberto Báez-Castro, Jesús Baldenebro-López, Laura Ceballos-Mendivil, Perla P Román-Bravo, Herbert Höpfl, Valentín Miranda-Soto, Daniel Glossman-Mitnik, Adriana Cruz-Enríquez, José J Campos-Gaxiola
The possibility of using less expensive and nontoxic metals, such as copper, as substitutes for more expensive heavy metals in the synthesis of new transition-metal complexes to be used as sensitizers in dye-sensitized solar cells (DSSCs) has stimulated research in this field. The novel photoluminescent copper(I) complex bis(triphenylphosphane-κP)[trans-(±)-2,4,5-tris(pyridin-2-yl)-2-imidazoline-κ(2)N(2),N(3)]copper(I) hexafluorophosphate, [Cu(I)(C18H15N5)(C18H15P)2]PF6, has been successfully synthesized and characterized by IR and (1)H NMR spectroscopy, as well as by single-crystal X-ray diffraction and thermogravimetric analysis...
March 1, 2017: Acta Crystallographica. Section C, Structural Chemistry
Haiya Sun, Dongzhi Liu, Tianyang Wang, Ting Lu, Wei Li, Siyao Ren, Wenping Hu, Lichang Wang, Xueqin Zhou
Effective charge separation is one of the key determinants for the photovoltaic performance of the dye-sensitized solar cells (DSSCs). Herein, two charge-separated (CS) sensitizers, MTPA-Pyc and YD-Pyc, have been synthesized and applied in DSSCs to investigate the effect of the CS states of the sensitizers on the device's efficiency. The CS states with lifetimes of 64 and 177 ns for MTPA-Pyc and YD-Pyc, respectively, are formed via the photoinduced electron transfer (PET) from the 4-styryltriphenylamine (MTPA) or 4-styrylindoline (YD) donor to the pyrimidine cyanoacrylic acid (Pyc) acceptor...
March 9, 2017: ACS Applied Materials & Interfaces
Xing Wei, Pascal Sugri Nbelayim, Go Kawamura, Hiroyuki Muto, Atsunori Matsuda
A layer of TiO2 nanotube (TNT) arrays with a thickness of 13 μm is synthesized by a two-step anodic oxidation from Ti metal foil. Surface charged Ag nanoparticles (NPs) are prepared by chemical reduction. After a pretreatment of the TNT arrays by acetone vapor, Ag NP filled TNT arrays can be achieved by electrophoretic deposition (EPD). Effects of the applied voltage during EPD such as DC-AC difference, frequency and waveform are investigated by quantitative analysis using atomic absorption spectroscopy. The results show that the best EPD condition is using DC 2 V + AC 4 V and a square wave of 1 Hz as the applied voltage...
March 3, 2017: Nanotechnology
Yun Liu, Di Shao, Xiaohui Bai, Zhenqing Yang, Chundan Lin, Changjin Shao
The cyano group (CN) of the acceptor in organic sensitizers plays an important role for highly efficient dye-sensitized solar cells. In this paper, three 5, 6-difluoro-2,1,3-benzothiadiazole (DFBTD) organic molecules with different number of CN units, named ME15, ME16 and ME17, were investigated by the density functional theory (DFT) and time-dependent DFT (TDDFT). We analyzed the CNs effects on the electronic structures, optical properties, adsorption modes and electron transfer and injection. The result shows that ME17 has the largest maximum absorption wavelength (λmax) among these new designed dyes due to the strong electron withdrawing ability of two CNs...
January 26, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Jialong Duan, Jing Wang, Qunwei Tang, Benlin He, Wei Wang
We present here a rational design and fabrication for all-weather dye-sensitized solar cells tailored with long-persistence phosphor materials, yielding a maximized photoelectric conversion efficiency of 8.86% under simulated sunlight and up to 26% in the dark.
March 18, 2017: Chemical Communications: Chem Comm
Degao Wang, Byron H Farnum, Matthew V Sheridan, Seth L Marquard, Benjamin D Sherman, Thomas J Meyer
Interfacial charge transfer and core/shell structures play important roles in Dye Sensitized Photoelectrosynthesis Cells (DSPEC) for water splitting into H2 and O2. An important element in the design of the photoanode in these devices is a core/shell structure which controls local electron transfer dynamics. Here, we introduce a new element, an internal layer of Al2O3 lying between the Sb:SnO2/TiO2 layers in a core/shell electrode which can improve photocurrents by up to 300%. In these structures, the results of photocurrent, transient absorption, and linear scan voltammetry measurements point to an important role for the Al2O3 layer in controlling internal electron transfer within the core/shell structure...
February 28, 2017: ACS Applied Materials & Interfaces
Saif Saadaoui, Mohamed Aziz Ben Youssef, Moufida Ben Karoui, Rached Gharbi, Emanuele Smecca, Vincenzina Strano, Salvo Mirabella, Alessandra Alberti, Rosaria A Puglisi
In this work, two natural dyes extracted from henna and mallow plants with a maximum absorbance at 665 nm were studied and used as sensitizers in the fabrication of dye-sensitized solar cells (DSSCs). Fourier transform infrared (FTIR) spectra of the extract revealed the presence of anchoring groups and coloring constituents. Two different structures were prepared by chemical bath deposition (CBD) using zinc oxide (ZnO) layers to obtain ZnO nanowall (NW) or nanorod (NR) layers employed as a thin film at the photoanode side of the DSSC...
2017: Beilstein Journal of Nanotechnology
Anurag Roy, Partha Pratim Das, Mukta Tathavadekar, Sumita Das, Parukuttyamma Sujatha Devi
As an alternative photosensitizer in dye-sensitized solar cells, bovine serum albumin (BSA) (a nonhazardous protein) was used in the synthesis of colloidal CdS nanoparticles (NPs). This system has been employed to replace the commonly used N719 dye molecule. Various nanostructured forms of ZnO, namely, nanorod and nanoparticle-based photoanodes, have been sensitized with colloidal CdS NPs to evaluate their effective performance towards quantum dot sensitized solar cells (QDSSCs). A polysulphide (S x(2-))-based electrolyte and Cu x S counter electrode were used for cell fabrication and testing...
2017: Beilstein Journal of Nanotechnology
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