The Experts below are selected from a list of 1866 Experts worldwide ranked by ideXlab platform
Dechu Zou - One of the best experts on this subject based on the ideXlab platform.
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an 8 07 efficient fiber dye sensitized solar cell based on a tio2 micron core array and multilayer structure photoanode
Nano Energy, 2015Co-Authors: Guicheng Liu, Ming Peng, Weixing Song, Hui Wang, Dechu ZouAbstract:Ti/TiO2 micron-cone array (TMCA) prepared through a synergy of chemical and electrochemical reactions was used as the frame and electron transfer channel for the photoanode of a fiber dye-sensitized solar cell (FDSSC). A TiO2 multilayer structure composed of compact, light scattering, and porous layers was introduced into the fiber photoanode for the first time based on the TMCA. The novel fiber Photoelectric Device attained a Photoelectric conversion efficiency of 8.07%, the highest value for FDSSCs with a Pt wire counter electrode to date, and a good flexibility. (C) 2014 Published by Elsevier Ltd.
Zoi Kapoula - One of the best experts on this subject based on the ideXlab platform.
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speed and accuracy of saccades vergence and combined eye movements in subjects with strabismus before and after eye surgery
Vision Research, 2009Co-Authors: Maria Pia Bucci, Dominique Bremondgignac, Zoi KapoulaAbstract:The purpose of the study was to examine spatio-temporal characteristics of horizontal eye movements in the natural space (saccade, vergence and combined movements) in young subjects with early onset convergent or divergent strabismus. Nine young subjects (8-20 years old) were tested: three with divergent strabismus, six with convergent strabismus. A standard paradigm was used to elicit pure horizontal saccades at far and at close viewing distance, pure vergence along the median plane (convergence and divergence) and saccades combined with vergence movements. Horizontal eye movements from both eyes were recorded by a Photoelectric Device. Eye movements were recorded before surgery, and, for the majority of the subjects, two times after surgery. Before surgery the accuracy of convergence and divergence movements in their pure or combined form was poor with respect to normal values. The mean velocity of convergence was also abnormally slow. Strabismus surgery improved significantly the accuracy of these types of eye movements. The speed of pure convergence and of divergence combined movements increased significantly after surgery. We concluded that poor vergence eye movement's performance, particularly those found for convergence in strabismic subjects could be due to impairment in the central structures related to sensory disparity inputs. Adaptive mechanisms promoted by the realignment of the eyes could be at the origin of the improvement in the vergence performances observed in our subjects after strabismus eye surgery.
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latency of saccades vergence and combined movements in children with early onset convergent or divergent strabismus
Vision Research, 2006Co-Authors: Maria Pia Bucci, Zoi Kapoula, Qing Yang, Dominique BremondgignacAbstract:The goal of this study was to examine latency of horizontal eye movements in the natural space (saccades, vergence, and combined saccade-vergence movements) in children with early onset convergent or divergent strabismus. Ten children were tested (8-11 years old): three with divergent strabismus, seven with convergent strabismus. A paradigm was used to elicit pure lateral saccades at far and near distance, pure vergence (convergence and divergence) and saccades combined with vergence movements. Horizontal eye movements from both eyes were recorded simultaneously by a Photoelectric Device (Oculometer, Dr. Bouis). The latency of saccades (at far and near distance), of vergence (convergence and divergence), and of combined movements greatly varies among subjects and has tendency to be longer than that observed in normal children of matched age, however, these differences reach significance in only a few cases. Children with divergent strabismus and residual gross binocular vision show abnormally longer vergence latencies than children with convergent strabismus without binocular vision. The initiation of combined movements does not show a dominant pattern, such as preceding vergence, as is found in normal children. Finally, strabismus surgery has no major effect on latencies. We conclude that there is no overall deficiency in latencies of eye movements in 3D space in children with early onset strabismus. Most likely, monocular visual input can be efficient as normal binocular vision for vergence movements. In a few subjects with divergent strabismus and fragile, intermittent binocular vision, latencies can be abnormally long, just because of the fragile binocular input and/or attention effort needs to use it. The absence of a pattern of initiation similar to normal children could be due to attention and fixation capabilities.
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the latency of saccades vergence and combined eye movements in children and in adults
Investigative Ophthalmology & Visual Science, 2002Co-Authors: Qing Yang, Maria Pia Bucci, Zoi KapoulaAbstract:PURPOSE. To examine the latency of eye movements in three-dimensional space (saccade, vergence, and combined saccade-vergence) in children and adults. METHODS. Fifteen normal children (4.5-12 years of age) and 15 normal adults (22-44 years of age) were tested. A standard paradigm was used to elicit pure lateral saccades at far and close viewing distance, pure vergence (convergence and divergence), and saccade combined with vergence movements. Horizontal eye movements from both eyes were recorded simultaneously by the oculometer, a Photoelectric Device. RESULTS. The mean latency in saccades, vergence, and combined eye movements was longer in children than in adults; the variability of such latency values was also larger in children. There was a progressive decrease with age in mean latency. All latencies approached or reached adult levels at approximately 10 to 12 years of age. Latency of saccades at close viewing distance was shorter than that at far in both adults and children. Convergence latency was longer than divergence latency in adults and most of the children. Latency of components of combined movements was longer than that of corresponding pure movements. Children initiated combined movements by triggering the vergence component first, whereas adults did not show a dominant pattern. The percentage of synchronous start of the two components was significantly higher in adults. CONCLUSIONS. Saccade and vergence-triggering mechanisms are distinct and mature progressively and in parallel with age. The capacity for synchronization of the two components of combined eye movements develops more slowly and remains below adult level, even at the age of 12 years.
Yingrui Sui - One of the best experts on this subject based on the ideXlab platform.
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toward ultra thin and omnidirectional perovskite solar cells concurrent improvement in conversion efficiency by employing light trapping and recrystallizing treatment
Nano Energy, 2019Co-Authors: Fengyou Wang, Yuhong Zhang, Meifang Yang, Lin Fan, Lili Yang, Yingrui SuiAbstract:Efficient perovskite solar cells with ultra-thin absorber would be very attractive for semitransparent-, tandem-, and flexible-photovoltaic application. However, the absorber with ultra-thin thickness always cause extra optical losses due to the insufficient light-harvesting. Here, we try to stress this key factor by constructing textured substrates and appropriate control of recrystallization treatment for ultra-thin perovskite solar cells that synergizes the merits characters including good broad-band, enhanced light-trapping and excellent separation/collection of photo-generated charges. In particularly, the isopropanol (IPA) - assisted recrystallizing treatment enable to form pinholes free perovskite films on a high-aspect-ratio substrate, which relax the trade-off between the optical enhancements and electrical deteriorations. The perovskite solar cell exhibits an efficiency of 18.6% by using an only ∼200-nm MAPbI3 as the absorber, which is a record efficiency for such thin-perovskite solar cells. We also exhibit the solar cells that shows the enhancement of daily generated power to 47.6% by using the crater-like architecture, as compared to traditional planar Devices. The concurrent enhancement in optical and electrical performance for achieving high-efficiency perovskite solar cells with thin absorber demonstrated here makes a simple process promising for Photoelectric Device application.
Enbo Wang - One of the best experts on this subject based on the ideXlab platform.
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a strategy to enhance the efficiency of quantum dot sensitized solar cells by decreasing electron recombination with polyoxometalate tio2 as the electronic interface layer
Chemsuschem, 2017Co-Authors: Li Chen, Weilin Chen, Jiabo Wang, Enbo WangAbstract:The serious electron recombination occurring in TiO2/quantum dot sensitizer/electrolyte interface is the key reason for hindering the further efficiency improvement of QDSCs. Polyoxometalate(POM) can be as electron transfer media to decreasing electron recombination of Photoelectric Device, which is due to the excellent oxidation reduction properties and thermostability. So in this paper, POM/TiO2 electronic interface layer prepared by a simple layer-by-layer self-assembly method is added between FTO and mesoporous TiO2 in the photoanode of the QDSCs, and their effects on the photovoltaic performance are systematically investigated. The photovoltaic experimental results and electron transmission mechanism explanation show that POM/TiO2 electronic interface layer in the QDSCs can obviously suppress the electron recombinations, increase the electron lifetime and result in smoother electron transmission. In summary, the best conversion efficiency of QDSCs with POM/TiO2 electronic interface layers are increased to 8.02%, which are improved by 25.1% compared to the QDSCs without POM/TiO2. This work firstly builds an electron transfer bridge between FTO and quantum dot sensitizer and paves the way for the further efficiency improvement of QDSCs.
Fengyou Wang - One of the best experts on this subject based on the ideXlab platform.
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toward ultra thin and omnidirectional perovskite solar cells concurrent improvement in conversion efficiency by employing light trapping and recrystallizing treatment
Nano Energy, 2019Co-Authors: Fengyou Wang, Yuhong Zhang, Meifang Yang, Lin Fan, Lili Yang, Yingrui SuiAbstract:Efficient perovskite solar cells with ultra-thin absorber would be very attractive for semitransparent-, tandem-, and flexible-photovoltaic application. However, the absorber with ultra-thin thickness always cause extra optical losses due to the insufficient light-harvesting. Here, we try to stress this key factor by constructing textured substrates and appropriate control of recrystallization treatment for ultra-thin perovskite solar cells that synergizes the merits characters including good broad-band, enhanced light-trapping and excellent separation/collection of photo-generated charges. In particularly, the isopropanol (IPA) - assisted recrystallizing treatment enable to form pinholes free perovskite films on a high-aspect-ratio substrate, which relax the trade-off between the optical enhancements and electrical deteriorations. The perovskite solar cell exhibits an efficiency of 18.6% by using an only ∼200-nm MAPbI3 as the absorber, which is a record efficiency for such thin-perovskite solar cells. We also exhibit the solar cells that shows the enhancement of daily generated power to 47.6% by using the crater-like architecture, as compared to traditional planar Devices. The concurrent enhancement in optical and electrical performance for achieving high-efficiency perovskite solar cells with thin absorber demonstrated here makes a simple process promising for Photoelectric Device application.