Enhanced efficiency of tri-layered dye solar cells with hydrothermally synthesized titania nanotubes as light scattering outer layer

2012 ◽  
Vol 520 (9) ◽  
pp. 3581-3586 ◽  
Author(s):  
Ambily Mathew ◽  
G. Mohan Rao ◽  
N. Munichandraiah
Keyword(s):  
Solar Cells ◽  
Light Scattering ◽  
Outer Layer ◽  
Titania Nanotubes ◽  
Dye Solar Cells

Performance of TiO2 Aggregates-Based Dye Solar Cells

2013 ◽  
Vol 737 ◽  
pp. 137-144 ◽  
Author(s):  
Norani Muti Mohamed ◽  
Siti Nur Azella Zaine
Keyword(s):  
Solar Cells ◽  
Light Scattering ◽  
Water Content ◽  
Calcination Temperature ◽  
Conversion Efficiency ◽  
Light Harvesting ◽  
Dye Solar Cells ◽  
Harvesting Efficiency ◽  
Light Harvesting Efficiency ◽  
20 Nm

TiO2 aggregates-based dye solar cells (DSCs) have gained an increasing interest due to their better light harvesting efficiency as a result of enhanced light scattering effect from the submicron spherical aggregates that can generate more electrons and the high internal surface area for dye chemisorption provided by nanocrystallites which made up the aggregates. Optimized TiO2 aggregates (0.45 µm) composing of nanocrystallites (10-40 nm) with desired physicochemical properties for enhanced overall light conversion efficiency of DSC were synthesized by varying the calcination temperature and water content in the hydrolysis of titanium alkoxide in ethanol. TiO2 aggregates obtained were characterized using FESEM, XRD and UV-Vis spectroscopy. The assembled DSCs were then evaluated using solar simulator under AM 1.5 (100 mW/cm2) simulated sunlight. Nanocrystallites were found to have an increasing size of 12 nm to 36 nm with increasing calcination temperature of 400C to 600C. Sample of aggregates calcined at 500C recorded the highest efficiency (4.456%) as the 20-nm nanocrystallites produced is considered to be the optimum size for dye absorption. With higher water content in the hydrolysis process, the aggregates lose their spherical shapes resulting in lower absorption intensity indicating the occurrence of low light scattering in the TiO2 film. Highest conversion efficiency was observed for DSC that used well-defined spherical TiO2 aggregates composing of 20-nm nanocrystallites which were synthesized using ethanol with low water content (0.9 vol%) followed by calcination at 500C. Thus, optimized TiO2 nanocrystallites which form spherical aggregate is critical in order to improve light harvesting efficiency of DSCs.

Optimized TiO2 Nanocrystallites Aggregates for Enhanced Efficiency in Dye Solar Cells

2014 ◽  
Vol 917 ◽  
pp. 35-44 ◽  
Author(s):  
Siti Nur Azella Zaine ◽  
Norani Muti Mohamed ◽  
Mohamad Azmi Bustam
Keyword(s):  
Solar Cells ◽  
Light Scattering ◽  
Water Content ◽  
Calcination Temperature ◽  
Conversion Efficiency ◽  
Internal Surface Area ◽  
Solar Simulator ◽  
Vis Spectroscopy ◽  
Dye Solar Cells ◽  
28 Nm

TiO2 aggregates-based dye solar cells (DSCs) have gained an increasing attention due to their enhanced harvesting of light radiance. The capability of this photoelectrode material is attributed to the submicron spherical aggregates that introduce light scattering effect which can generate more electrons whilst high internal surface area for dye chemisorption is provided by nanocrystallites which made up the aggregates. Here, TiO2 aggregates (0.45-0.20 μm) composing of nanocrystallites (10-28 nm) with desired physicochemical properties for enhanced overall light conversion efficiency of DSC were synthesized by varying the water content in the hydrolysis of titanium alkoxide in ethanol and calcination temperature. TiO2 aggregates obtained were characterized using FESEM, XRD and UV-Vis spectroscopy. The assembled DSCs were then evaluated using solar simulator under AM 1.5 (100 mW/cm2) simulated sunlight. With higher water content in the hydrolysis process, the aggregates reduce in size and lose their spherical shapes resulting in lower absorption intensity indicating the occurrence of low light scattering in the TiO2 film. Nanocrystallites were found to have an increasing size of 12 nm to 28 nm with increasing calcination temperature of 400°C to 700°C. Sample of aggregates calcined at 450°C recorded the highest efficiency (~4%). Highest conversion efficiency was observed for DSC that used well-defined spherical TiO2 aggregates composing of nanocrystallites which were synthesized at optimum synthesis parameter which is by using ethanol with low water content (0.9 vol%) followed by calcination at 450°C. Thus, optimized TiO2 nanocrystallites which form spherical aggregate is critical in order to improve light harvesting efficiency of DSCs.

scholarly journals Effect of Diffuse Light Scattering Designs on the Efficiency of Dye Solar Cells: An Integral Optical and Electrical Description

2012 ◽  
Vol 116 (21) ◽  
pp. 11426-11433 ◽  
Author(s):  
Francisco Enrique Gálvez ◽  
Erno Kemppainen ◽  
Hernán Míguez ◽  
Janne Halme
Keyword(s):  
Solar Cells ◽  
Light Scattering ◽  
Diffuse Light ◽  
Dye Solar Cells

Experimental investigation and modelling of light scattering in a-Si:H solar cells deposited on glass/ZnO:Al substrates

2002 ◽  
Vol 715 ◽  
Author(s):  
J. Krc ◽  
M. Zeman ◽  
O. Kluth ◽  
F. Smole ◽  
M. Topic
Keyword(s):  
Surface Roughness ◽  
Experimental Investigation ◽  
Solar Cells ◽  
Angular Distribution ◽  
Light Scattering ◽  
Optical Model ◽  
Distribution Functions ◽  
Interface Roughness ◽  
Scattering Parameters ◽  
Good Agreement

AbstractThe descriptive scattering parameters, haze and angular distribution functions of textured ZnO:Al transparent conductive oxides with different surface roughness are measured. An approach to determine the scattering parameters of all internal interfaces in p-i-n a-Si:H solar cells deposited on the glass/ZnO:Al substrates is presented. Using the determined scattering parameters as the input parameters of the optical model, a good agreement between the measured and simulated quantum efficiencies of the p-i-n a-Si:H solar cells with different interface roughness is achieved.

Effect of TiO2 Layers Thickness Inhomogeneity on Transport of Charge Carriers in Disperse Dye Solar Cells

2017 ◽  
Vol 9 (6) ◽  
pp. 06001-1-06001-5
Author(s):  
I. I. Ivanov ◽  
◽  
V. B. Lozinskii ◽  
V. P. Kasatkin ◽  
◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Carriers ◽  
Disperse Dye ◽  
Dye Solar Cells

scholarly journals Carbon nanotube film replacing silver in high-efficiency solid-state dye solar cells employing polymer hole conductor

2015 ◽  
Vol 19 (10) ◽  
pp. 3139-3144 ◽  
Author(s):  
Kerttu Aitola ◽  
Jinbao Zhang ◽  
Nick Vlachopoulos ◽  
Janne Halme ◽  
Antti Kaskela ◽  
...  
Keyword(s):  
Solar Cells ◽  
Carbon Nanotube ◽  
Solid State ◽  
High Efficiency ◽  
Carbon Nanotube Film ◽  
Dye Solar Cells

Inspection Of Recombination Active Defects For Sige And Solar Cells

1996 ◽  
Vol 442 ◽  
Author(s):  
O.V. Astafiev ◽  
V.P. Kalinushkin ◽  
N.V. Abrosimov
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Light Scattering ◽  
Grain Boundary ◽  
Single Crystals ◽  
Defect Structure ◽  
Scattering Method ◽  
Recombination Activity ◽  
Cell Production ◽  
Materials Used

AbstractMapping Low Angle Light Scattering method (MLALS) is proposed to study defect structure in materials used for solar cell production. Several types of defects are observed in Czochralski Si1−xGex (0.022<x<0.047) single crystals. Recombination activity of these defects is investigated. The possibility of contactless visualisation of grain boundary recombination in polysilicon is also demonstrated.

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