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Huaide Xiang, Wei Fan, Jiahui Li, Tianyue Li, Neil Robertson, Xiongrong Song, Wenjun Wu, Zhaohui Wang, Weihong Zhu, He Tian
Recently, enormous research passion has been devoted to enhance the power conversion efficiency (PCE) of porphyrin sensitizers for DSSCs, but the major stumbling block is its absorption defects in visible spectrum region. To address the challenge, herein we reported a duplexing high performance photovoltaic result for DSSCs based on a novel D-π-A sensitizer FW-1 7H-Dibenzo[c,g] carbazole-substituted and fused Zn-porphyrin, co-sensitized with benzotriazole featured dye (WS-5) in iodine and cobalt redox system and got high PCE of 10...
December 5, 2016: ChemSusChem
Ying Yu, Xing Li, Zhongjin Shen, Xiaoyu Zhang, Peng Liu, Yuting Gao, Tao Jiang, Jianli Hua
In this work, we reported two new quinoxaline-based sensitizers (BQI and BQII) for p-type dye-sensitized solar cells (p-DSSCs) featuring carboxylic acid and pyridine as anchoring groups, respectively, in combination with triphenylamine donor. The optical, electrochemical and photovoltaic properties of BQI and BQII were investigated. Results showed that BQI-based p-DSSC with carboxylic acid anchoring group obtained higher photoelectric conversion efficiency (PCE) of 0.140%. To further optimize the device performance, we added a layer of TiO2 on the surface of NiO film as a barrier layer, which contributed to the improvement of the photocurrent density from 3...
November 10, 2016: Journal of Colloid and Interface Science
Ibrahim M A Mohamed, Van-Duong Dao, Ahmed S Yasin, Ho-Suk Choi, KhalilAbdelrazek Khalil, Nasser A M Barakat
Chemical doping is a widely-used strategy to improve the performance of TiO2 for the dye-sensitized solar cells (DSCs). However, the effect of two efficient dopants has been rarely investigated. We present the synthesis of GO@SnO2/TiO2 nanofibers (NFs) by a facile method using electrospinning and hydrothermal processes. The synthesized NFs are described in terms of morphology, crystallinity and chemistry through FESEM, TEM, HR-TEM, XRD, EDX, XPS, FT-IR and Raman spectra. As the results, the axial ratio and the average diameter of NFs decreased after the hydrothermal treatment and calcination process, respectively...
November 12, 2016: Journal of Colloid and Interface Science
Guo-Jun Kang, Chao Song, Xue-Feng Ren
The electronic geometries and optical properties of two D-π-A type zinc porphyrin dyes (NCH₃-YD2 and TPhe-YD) were systematically investigated by density functional theory (DFT) and time-dependent density functional theory (TD-DFT) to reveal the origin of significantly altered charge transfer enhancement by changing the electron donor of the famous porphyrin-based sensitizer YD2-o-C8. The molecular geometries and photophysical properties of dyes before and after binding to the TiO₂ cluster were fully investigated...
November 25, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Chi-Ho Siu, Lawrence Tien Lin Lee, Po-Yu Ho, Cheuk-Lam Ho, Tao Chen, Songwut Suramitr, Supa Hannongbua, Zhiyuan Xie, Mingdeng Wei, Wai-Yeung Wong
A new series of acetylene-bridged phenothiazine-based dianchoring dyes have been synthesized and fully characterized, and used as the photoactive layer for the fabrication of conventional dye-sensitized solar cells (DSSCs). Tuning of their photophysical and electrochemical properties using different π-conjugated aromatic rings as the central bridge has been demonstrated. This molecular design strategy successfully inhibits the undesirable charge recombination and prolongs the electron lifetime significantly to improve the power conversion efficiency (η), which were proven by the detailed studies of electrochemical impedance spectroscopy (EIS) and open-circuit voltage decay (OCVD)...
November 29, 2016: Chemistry, An Asian Journal
Yousuke Ooyama, Naoya Yamaguchi, Joji Ohshita, Yutaka Harima
D-π-A dyes NI-4 bearing a pyridyl group, YNI-1 bearing two pyridyl groups and YNI-2 bearing two thienylpyridyl groups as the anchoring group on the TiO2 surface have been developed as dye sensitizers for dye-sensitized solar cells (DSSCs), where NI-4 and YNI-2 can adsorb onto the TiO2 electrode through the formation of the coordinate bond between the pyridyl group of the dye and the Lewis acid site (exposed Ti(n+) cations) on the TiO2 surface, but YNI-1 is predominantly adsorbed on the TiO2 electrode through the formation of the hydrogen bond between the pyridyl group of the dye and the Brønsted acid sites (surface-bound hydroxyl groups, Ti-OH) on the TiO2 surface...
November 25, 2016: Physical Chemistry Chemical Physics: PCCP
Guohai Yuan, Mingxia Li, Mingqi Yu, Chungui Tian, Guofeng Wang, Honggang Fu
Y2O3/Y2O2S:Eu(3+) nanocomposites were successfully prepared by reducing Y2O3:Eu(3+) nanocrystals. The obtained Y2O3/Y2O2S:Eu(3+) nanocomposites not only can emit enhanced red luminescence excited at 338 nm, but also can be used to improve the efficiency of the dye sensitized solar cells, resulting an efficiency of 8.38%, which is a noticeable enhancement of 12% compared to the cell without Y2O3/Y2O2S:Eu(3+) nanocomposites. The results of the incident photon to current, dynamic light scattering, and diffuse reflectance spectra indicated that the enhancement of the cell efficiency was mainly related to the light scattering effect of Y2O3/Y2O2S:Eu(3+) nanocomposites...
November 22, 2016: Scientific Reports
Chirawat Chitpakdee, Siriporn Jungsuttiwong, Taweesak Sudyoadsuk, Vinich Promarak, Nawee Kungwan, Supawadee Namuangruk
The effects of type and position of π-linker in carbazole-carbazole based dyes on their performance in dye-sensitized solar cells (DSSCs) were investigated by DFT and TDDFT methods. The calculated electronic energy level, electron density composition, charge injection and charge recombination properties were compared with those of the high performance CCT3A dye synthesized recently. It is found that that mixing a benzothiadizole (B) unit with two thiophene (T) units in the π-spacer can greatly shift absorption wavelength to near infrared region and enhance the light harvesting efficiency (LHE) resulting in increasing of short-circuit current density (Jsc), whereas a thienothiophene unit does not affect those properties...
November 12, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Zhehao Zhou, Wei Xiao, Xiaowen Shi, Bin Ding, Qun Wang, Yingfei Zhan, Hongbing Deng, Yumin Du
By combining the initial solvent volatilization and ultimate calcination to form highly nanoporous polystyrene/titanium dioxide (PS/TiO2) composite nanofibrous mats were fabricated via electrospinning, then the PS was removed afterwards by calcination, and finally porous TiO2 nanofibers were formed successfully. The porous structure of the nanofibers was characterized by field emission scanning electron microscopy and Brunauer-Emmett-Teller measurements, which indicated that the size and the diameter of the pore and the ratio of the surface area to the volume of the mats were regulated by adjusting the weight ratios of tetrahydrofuran and N,N-dimethylformamide in the binary solvent mixtures...
November 9, 2016: Journal of Colloid and Interface Science
Michael Wykes, Fabrice Odobel, Carlo Adamo, Ilaria Ciofini, Frédéric Labat
We present hybrid, periodic, spin-polarized density functional theory calculations of antiferromagnetic NiO bulk, of its clean (100) surface and of the binding on this latter of four different organic ligands, relevant for p-type dye-sensitized solar cells (p-DSSC) applications. We find evidence for a strong chemisorption of all ligands to the NiO surface in the form of short interatomic distances between surface Ni atoms and ligand atoms, confirmed by high binding energies. Although the analysis of the impact of the ligand adsorption on the density of states of the NiO substrate reveals significant modifications, the overall picture obtained is in line with the operation principles of p-DSSC in all cases...
December 2016: Journal of Molecular Modeling
Jiang Sheng, Linhua Hu, Li'e Mo, Jichun Ye, Songyuan Dai
Monodisperse anatase hierarchical microspheres were produced via a simple sol-gel process. These microspheres in the sub-wavelength diameter of 320-750 nm could scatter visible light efficiently as whispering gallery modes (WGM) corresponding to the dye sensitized wavelength, and load a large number of dye molecules with a large surface area (149.82 m(2) g(-1)). Dye-sensitized solar cells (DSCs) based on the microsphere monolayer adsorbed light fully over the entire wavelength region and facilitated electrolyte diffusion due to larger voids between the microspheres, compared to the conventional film...
November 30, 2016: Physical Chemistry Chemical Physics: PCCP
G Hermann, J C Tremblay
In the present contribution, the ultrafast photoinduced electron migration dynamics at the interface between an alizarin dye and an anatase TiO2 thin film is investigated from first principles. Comparison between a time-dependent many-electron configuration interaction ansatz and a single active electron approach sheds light on the importance of many-body effects, stemming from uniquely defined initial conditions prior to photoexcitation. Particular emphasis is put on understanding the influence of the binding mode on the migration process...
November 7, 2016: Journal of Chemical Physics
Masanori Yamamoto, Yusuke Nishizawa, Pavel Chábera, Fusheng Li, Torbjörn Pascher, Villy Sundström, Licheng Sun, Hiroshi Imahori
A new subporphyrin was synthesized for use as a molecular sensitizer in electrochemical and dye-sensitized photoelectrochemical water oxidation. A photoelectrochemical cell with a TiO2 electrode modified with the sensitizer and a molecular water oxidation catalyst generated higher photocurrent than reference cells that have electrodes modified with either the photosensitizer or the catalyst under visible light (λ > 500 nm) illumination. Oxygen evolution was confirmed after photolysis by GC and GC-MS analyses using isotope-labeling experiments...
November 17, 2016: Chemical Communications: Chem Comm
Zhen Wen, Min-Hsin Yeh, Hengyu Guo, Jie Wang, Yunlong Zi, Weidong Xu, Jianan Deng, Lei Zhu, Xin Wang, Chenguo Hu, Liping Zhu, Xuhui Sun, Zhong Lin Wang
Wearable electronics fabricated on lightweight and flexible substrate are believed to have great potential for portable devices, but their applications are limited by the life span of their batteries. We propose a hybridized self-charging power textile system with the aim of simultaneously collecting outdoor sunshine and random body motion energies and then storing them in an energy storage unit. Both of the harvested energies can be easily converted into electricity by using fiber-shaped dye-sensitized solar cells (for solar energy) and fiber-shaped triboelectric nanogenerators (for random body motion energy) and then further stored as chemical energy in fiber-shaped supercapacitors...
October 2016: Science Advances
Lidia Contreras, Jesús Idígoras, Anna Todinova, Manuel Salado, Samrana Kazim, Shahzada Ahmad, Juan A Anta
Hysteresis is one of the most remarkable features of perovskite solar cells; however, it is also present in other kinds of devices such as dye-sensitized solar cells. Hysteresis is due to underlying slow dynamic processes that interfere with the process of charge separation which depends critically on the selective contacts used. In this work we focus on the low-frequency (0.1-10 Hz) dynamics using impedance and intensity-modulated photocurrent spectroscopy and found that both perovskite solar cells (PSCs) and "viscous electrolyte containing" dye-sensitized solar cells (DSSCs) can be described on the same fundamental grounds...
November 16, 2016: Physical Chemistry Chemical Physics: PCCP
Arto Hiltunen, Kimmo Lahtonen, Jesse Saari, Anniina Ojanperä, Essi Sarlin, Holger Wondraczek, Alexander Efimov, Kimmo Kaunisto, Paola Vivo, Chiara Maccato, Davide Barreca, Pedro Fardim, Nikolai Tkachenko, Mika Valden, Helge Lemmetyinen
The preparation of weblike titanium dioxide thin films by atomic layer deposition on cellulose biotemplates is reported. The method produces a TiO2 web, which is flexible and transferable from the deposition substrate to that of the end application. Removal of the cellulose template by calcination converts the amorphous titania to crystalline anatase and gives the structure a hollow morphology. The TiO2 webs are thoroughly characterized using electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy to give new insight into manufacturing of porous titanium dioxide structures by means of template-based methods...
November 2, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Jinlei Xu, Shufang Wu, Jingpeng Jin, Tianyou Peng
Brookite TiO2 nanoparticles with small sizes (hereafter denoted as BTP particles) were synthesized through the hydrothermal treatment of TiCl4 solution with Pb(NO3)2 as an additive. The obtained BTP particles have a large specific surface area (∼122.2 m(2) g(-1)) and relatively uniform particle sizes (∼10 nm) with the coexistence of a small quantity of nanorods with a length of ∼100 nm. When used as a photoanode material for dye-sensitized solar cells (DSSCs), the BTP particles show a much higher dye-loading content than the brookite TiO2 quasi nanocubes (denoted as BTN particles) with a mean size of ∼50 nm and a specific surface area of ∼34...
November 1, 2016: Nanoscale
Yu Wang, Zhiwei Zheng, Tianyue Li, Neil Robertson, Huaide Xiang, Wenjun Wu, Jianli Hua, Wei-Hong Zhu, He Tian
To meet the requirement of high molar extinction coefficient, broaden absorption spectrum and photo/thermal stable for sensitizers of quasi-solid dye-sensitized solar cells (Qs-DSSCs) with reduced film thickness, a novel D-A-π-A configuration organic sensitizer IQ22 was specifically designed, in which the conjugation bridge of cyclopentadithiophene (CPDT) unit was incorporated to widen the light response and enhance molar coefficients for increasing the short-circuit current density (JSC), and the octane chain on CPDT was targeted for suppressing the charge recombination and improving the open-circuit voltage (VOC)...
October 31, 2016: ACS Applied Materials & Interfaces
Yan Hao, Yasemin Saygili, Jiayan Cong, Anna I K Eriksson, Wenxing Yang, Jinbao Zhang, Enrico Polanski, Kazuteru Nonomura, Shaik Mohammed Zakeeruddin, Michael Grätzel, Anders Hagfeldt, Gerrit Boschloo
Blue, green-color dyes as well as NIR-absorbing dyes have attracted great interest because of their excellent ability of absorbing the incident photons in the red and near-infra red range region. A novel blue-color D-π-A dye (Dyenamo blue), which based on the diketopyrrolopyrrole (DPP)-core has been designed and synthesized. Assembled with the cobalt bipyridine-based electrolytes, the device with Dyenamo blue achieved a satisfying efficiency of 7.3% under one sun (AM 1.5G). The co-sensitization strategy was further applied on this blue organic dye together with a red-color D-π-A dye (D35)...
October 28, 2016: ACS Applied Materials & Interfaces
Yousuke Ooyama, Kensuke Furue, Toshiaki Enoki, Masahiro Kanda, Yohei Adachi, Joji Ohshita
A type-I/type-II hybrid dye sensitizer with a pyridyl group and a catechol unit as the anchoring group has been developed and its photovoltaic performance in dye-sensitized solar cells (DSSCs) is investigated. The sensitizer has the ability to adsorb on a TiO2 electrode through both the coordination bond at Lewis acid sites and the bidentate binuclear bridging linkage at Brønsted acid sites on the TiO2 surface, which makes it possible to inject an electron into the conduction band of the TiO2 electrode by the intramolecular charge-transfer (ICT) excitation (type-I pathway) and by the photoexcitation of the dye-to-TiO2 charge transfer (DTCT) band (type-II pathway)...
October 28, 2016: Physical Chemistry Chemical Physics: PCCP
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