Light-harvesting effect in photoelectric conversion with dye multilayers on a semiconductor electrode

1988 ◽  
Vol 92 (3) ◽  
pp. 754-759 ◽  
Author(s):  
Hiroyasu Sato ◽  
Masahiro Kawasaki ◽  
Kazuo Kasatani ◽  
Yuji Higuchi ◽  
Terukazu Azuma ◽  
...  
Keyword(s):  
Light Harvesting ◽  
Photoelectric Conversion ◽  
Semiconductor Electrode

scholarly journals A down-shifting Eu 3+ -doped Y 2 WO 6 /TiO 2 photoelectrode for improved light harvesting in dye-sensitized solar cells

2018 ◽  
Vol 5 (2) ◽  
pp. 171054 ◽  
Author(s):  
J. Llanos ◽  
I. Brito ◽  
D. Espinoza ◽  
Ramkumar Sekar ◽  
P. Manidurai
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Light Harvesting ◽  
Electrochemical Impedance ◽  
Dye Sensitized Solar Cells ◽  
Photoelectric Conversion Efficiency ◽  
Visible Radiation ◽  
Photoelectric Conversion ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Y 1.86 Eu 0.14 WO 6 phosphors were prepared using a solid-state reaction method. Their optical properties were analysed, and they was mixed with TiO 2 , sintered, and used as a photoelectrode (PE) in dye-sensitized solar cells (DSSCs). The as-prepared photoelectrode was characterized by photoluminescence spectroscopy, diffuse reflectance, electrochemical impedance spectroscopy (EIS) and X-ray diffraction. The photoelectric conversion efficiency of the DSSC with TiO 2 :Y 1.86 Eu 0.14 WO 6 (100:2.5) was 25.8% higher than that of a DSCC using pure TiO 2 as PE. This high efficiency is due to the ability of the luminescent material to convert ultraviolet radiation from the sun to visible radiation, thus improving the solar light harvesting of the DSSC.

scholarly journals Photoelectric Conversion with the Dye Multilayer on a Semiconductor Electrode

1986 ◽  
Vol 15 (10) ◽  
pp. 1651-1654 ◽  
Author(s):  
Yuji Higuchi ◽  
Kazuo Kasatani ◽  
Masahiro Kawasaki ◽  
Hiroyasu Sato
Keyword(s):  
Photoelectric Conversion ◽  
Semiconductor Electrode

Highly enhanced UV-vis-NIR light harvesting and photoelectric conversion of a pyrene MOF by encapsulation of the D–π–A cyanine dye

2020 ◽  
Vol 8 (48) ◽  
pp. 17169-17175
Author(s):  
Xiao-Gang Yang ◽  
Jian-Hua Qin ◽  
Ya-Dan Huang ◽  
Zhi-Min Zhai ◽  
Lu-Fang Ma ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Visible Light ◽  
Light Harvesting ◽  
Exchange Process ◽  
Cyanine Dye ◽  
Photoelectric Conversion ◽  
Ion Exchange Process ◽  
Nir Light ◽  
Conversion Performance

Through a facile ion exchange process, cyanine dye can be encapsulated into MOF nanochannels, largely extends the light-harvesting range to visible-light and NIR region, promotes photoelectric conversion performance 15 times higher than that of the pristine MOF.

Creating electrochemical gradients by light: from bio-inspired concepts to photoelectric conversion

2014 ◽  
Vol 16 (37) ◽  
pp. 19781-19789 ◽  
Author(s):  
Xiaojiang Xie ◽  
Eric Bakker
Keyword(s):  
Light Harvesting ◽  
Artificial Light ◽  
Photoelectric Conversion ◽  
Harvesting Systems

Artificial light harvesting systems can be used to convert light into electrochemical gradients and photocurrents.

Co-sensitization promoted light harvesting with a new mixed-addenda polyoxometalate [Cu(C12H8N2)2]2[V2W4O19]·4H2O in dye-sensitized solar cells

2015 ◽  
Vol 44 (42) ◽  
pp. 18553-18562 ◽  
Author(s):  
Sha-Sha Xu ◽  
Wei-Lin Chen ◽  
Yan-Hua Wang ◽  
Yang-Guang Li ◽  
Zhu-Jun Liu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Conversion Efficiency ◽  
Light Harvesting ◽  
Dye Sensitized Solar Cells ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

[Cu(C12H8N2)2]2[V2W4O19]·4H2O-doped TiO2 composites were introduced into the dye-sensitized solar cells as co-sensitizers in N719-sensitized photoanodes to enhance the photoelectric conversion efficiency.

scholarly journals Enhancement of Biosensors by Implementing Photoelectrochemical Processes

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3281 ◽  
Author(s):  
Melisa del Barrio ◽  
Gabriel Luna-López ◽  
Marcos Pita
Keyword(s):  
Light Harvesting ◽  
Electrochemical Biosensors ◽  
Chemical Signal ◽  
Semiconducting Materials ◽  
Energy Applications ◽  
Semiconductor Interfaces ◽  
Biological Recognition ◽  
Recognition Elements ◽  
Semiconductor Electrode

Research on biosensors is growing in relevance, taking benefit from groundbreaking knowledge that allows for new biosensing strategies. Electrochemical biosensors can benefit from research on semiconducting materials for energy applications. This research seeks the optimization of the semiconductor-electrode interfaces including light-harvesting materials, among other improvements. Once that knowledge is acquired, it can be implemented with biological recognition elements, which are able to transfer a chemical signal to the photoelectrochemical system, yielding photo-biosensors. This has been a matter of research as it allows both a superior suppression of background electrochemical signals and the switching ON and OFF upon illumination. Effective electrode-semiconductor interfaces and their coupling with biorecognition units are reviewed in this work.

High-Resolution electron crystallography of the light-harvesting chlorophyll-a/b protein complex from chloroplast membranes

1990 ◽  
Vol 48 (1) ◽  
pp. 610-610
Author(s):  
Werner Kühlbrandt ◽  
Da Neng Wang ◽  
K.H. Downing
Keyword(s):  
High Resolution ◽  
Electron Diffraction ◽  
Chlorophyll A ◽  
Protein Complex ◽  
Structural Integrity ◽  
Light Harvesting ◽  
Lhc Ii ◽  
Diffraction Patterns ◽  
Difference Fourier ◽  
2D Crystals

The light-harvesting chlorophyll-a/b protein complex (LHC-II) is the most abundant membrane protein in the chloroplasts of green plants where it functions as a molecular antenna of solar energy for photosynthesis. We have grown two-dimensional (2d) crystals of the purified, detergent-solubilized LHC-II . The crystals which measured 5 to 10 μm in diameter were stabilized for electron microscopy by washing with a 0.5% solution of tannin. Electron diffraction patterns of untilted 2d crystals cooled to 130 K showed sharp spots to 3.1 Å resolution. Spot-scan images of 2d crystals were recorded at 160 K with the Berkeley microscope . Images of untilted crystals were processed, using the unbending procedure by Henderson et al . A projection map of the complex at 3.7Å resolution was generated from electron diffraction amplitudes and high-resolution phases obtained by image processing .A difference Fourier analysis with the same image phases and electron diffraction amplitudes recorded of frozen, hydrated specimens showed no significant differences in the 3.7Å projection map. Our tannin treatment therefore does not affect the structural integrity of the complex.

Macroorganisation and flexibility of thylakoid membranes

2019 ◽  
Vol 476 (20) ◽  
pp. 2981-3018 ◽  
Author(s):  
Petar H. Lambrev ◽  
Parveen Akhtar
Keyword(s):  
Light Harvesting ◽  
Current Knowledge ◽  
Three Dimensional ◽  
Photosynthetic Apparatus ◽  
Dynamic Responses ◽  
State Transitions ◽  
Photochemical Quenching ◽  
Light Harvesting Complex ◽  
Complex Ii ◽  
Light Harvesting Complex Ii

Abstract The light reactions of photosynthesis are hosted and regulated by the chloroplast thylakoid membrane (TM) — the central structural component of the photosynthetic apparatus of plants and algae. The two-dimensional and three-dimensional arrangement of the lipid–protein assemblies, aka macroorganisation, and its dynamic responses to the fluctuating physiological environment, aka flexibility, are the subject of this review. An emphasis is given on the information obtainable by spectroscopic approaches, especially circular dichroism (CD). We briefly summarise the current knowledge of the composition and three-dimensional architecture of the granal TMs in plants and the supramolecular organisation of Photosystem II and light-harvesting complex II therein. We next acquaint the non-specialist reader with the fundamentals of CD spectroscopy, recent advances such as anisotropic CD, and applications for studying the structure and macroorganisation of photosynthetic complexes and membranes. Special attention is given to the structural and functional flexibility of light-harvesting complex II in vitro as revealed by CD and fluorescence spectroscopy. We give an account of the dynamic changes in membrane macroorganisation associated with the light-adaptation of the photosynthetic apparatus and the regulation of the excitation energy flow by state transitions and non-photochemical quenching.

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