Effect of Sintering Profiles on Titania Interparticle Connectivity, Electron Transport and Interfacial Resistance in Dye-Sensitized Solar Cells

2013 ◽  
Vol 771 ◽  
pp. 143-157
Author(s):  
Ajay K. Jena ◽  
Shyama Prasad Mohanty ◽  
Parag Bhargava
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Surface Area ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Slight Reduction ◽  
Dye Sensitized ◽  
Dye Loading ◽  
Higher Temperature ◽  
Sensitized Solar Cells

TiO2 films, which are often sintered at 450°C for 30 or 60 minutes for application in dye-sensitized solar cells (DSSCs), show no appreciable connectivity between the TiO2 particles. The present work deals with connectivity between TiO2 particles and its effect on electron diffusion and short circuit current density (Jsc) of DSSCs made from TiO2 films sintered at lower temperature for longer time (450°C, 550°C, 650°C for 60 minutes) and higher temperature for shorter time (450°C for 60 min followed by 700°C and 800°C for 10 and 20 minutes). TiO2 films sintered at higher temperature (700°C) but for shorter time (10 min) exhibited better connectivity between the particles with slight reduction in surface area. This caused faster transport of electron through the films sintered at 700°C/10 min than 450°C/60 min and 550°C/60 min and hence, resulted in highest Jsc (~ 7 mA/cm2). Films sintered at 650°C/60 min and 700°C/20 min showed better interparticle connectivity but had significantly lower surface area, dye loading and therefore, despite faster diffusion of electron in these films Jsc was measured to be lower. Sintering at 700°C/10 min following 450°C/60 min could be considered the best in terms of dye loading, electron transport and efficiency.

scholarly journals Dyes Amount and Light Scattering Influence on the Photocurrent Enhancement of Titanium Dioxide Hierarchically Structured Photoanodes for Dye-Sensitized Solar Cells

Coatings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 13 ◽  
Author(s):  
Wen-Yao Huang ◽  
Tung-Li Hsieh
Keyword(s):  
Titanium Dioxide ◽  
Solar Cells ◽  
Light Scattering ◽  
Light Harvesting ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Strong Light ◽  
Dye Sensitized ◽  
Dye Loading ◽  
Sensitized Solar Cells

In this study, we prepared and analyzed the properties of hill-like hierarchically structured titanium dioxide (TiO2) photoanodes for dye-sensitized solar cells (DSSCs). We expected that the presence of appropriately aggregated TiO2 clusters in the photoanode layer would translate to relatively strong light scattering and dye loading, increasing the photovoltaic efficiency. A detailed light-harvesting study was performed by employing polyvinyl alcohol (PVA) polymers of different molecular weights as binders for the aggregation of the TiO2 nanoparticles (P-25 Degussa). Hence, we obtained a series of TiO2 films, presenting a variety of morphologies. Their reflection, as well as absorbance of light by the attached dye, the amount of dye loading, and the performance of the fabricated DSSC devices were investigated. Our optimized device, with a relatively high dye loading and good light harvesting ability, was able to enhance the short-circuit current (Jsc) in the DSSCs by 23%.

scholarly journals Investigation on the Tunable-Length Zinc Oxide Nanowire Arrays for Dye-Sensitized Solar Cells

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Shou-Yi Kuo ◽  
Ming-Yang Hsieh ◽  
Hsin-I Lin
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Surface Area ◽  
Power Conversion ◽  
Dye Sensitized Solar Cells ◽  
Nanowire Arrays ◽  
Zno Nanowire ◽  
Dye Sensitized ◽  
Dye Loading ◽  
Sensitized Solar Cells

We had successfully fabricated ZnO-based nanowires by vapor transport method in the furnace tube. ZnO nanowire arrays grown in 600°C for 30 minutes, 60 minutes, 90 minutes, and 120 minutes had applied to the dye-sensitized solar cells. The dye loading is proportional to the total equivalent surface area of ZnO nanowire arrays in the cells and plays an important role in improving power conversion efficiency. The highest efficiency was observed in DSSC sample with ZnO nanowires grown for 90 minutes, which had the largest equivalent surface area and also the highest dye loading. According to our experimental results, the enhancement in power conversion efficiency is attributed to the higher light harvesting and reduction of carrier recombination. In addition, ZnO nanowires also contribute to the photocurrent in the UV region.

scholarly journals Efficient Dye-Sensitized Solar Cells Composed of Nanostructural ZnO Doped with Ti

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 273 ◽  
Author(s):  
Mati Rahman ◽  
Mingdeng Wei ◽  
Fengyan Xie ◽  
Matiullah Khan
Keyword(s):  
Solar Cells ◽  
Surface Area ◽  
Photoelectron Spectroscopy ◽  
High Surface ◽  
Dye Sensitized Solar Cells ◽  
Solar Cell Performance ◽  
X Ray ◽  
Dye Sensitized ◽  
Dye Loading ◽  
Sensitized Solar Cells

Photoanode materials with optimized particle sizes, excellent surface area and dye loading capability are preferred in good-performance dye sensitized solar cells. Herein, we report on an efficient dye-sensitized mesoporous photoanode of Ti doped zinc oxide (Ti-ZnO) through a facile hydrothermal method. The crystallinity, morphology, surface area, optical and electrochemical properties of the Ti-ZnO were investigated using X-ray photoelectron spectroscopy, transmission electron microscopy and X-ray diffraction. It was observed that Ti-ZnO nanoparticles with a high surface area of 131.85 m2 g−1 and a controlled band gap, exhibited considerably increased light harvesting efficiency, dye loading capability, and achieved comparable solar cell performance at a typical nanocrystalline ZnO photoanode.

Plasmonic, interior-decorated, one-dimensional hierarchical nanotubes for high-efficiency, solid-state, dye-sensitized solar cells

2015 ◽  
Vol 3 (19) ◽  
pp. 10439-10447 ◽  
Author(s):  
Sung Hoon Ahn ◽  
Dong Jun Kim ◽  
Won Seok Chi ◽  
Jong Hak Kim
Keyword(s):  
Solar Cells ◽  
Light Scattering ◽  
Solid State ◽  
Electron Transport ◽  
Surface Area ◽  
High Efficiency ◽  
Dye Sensitized Solar Cells ◽  
One Dimensional ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

1D, hierarchical, hetero-nanotube photoanodes (Au@SnO2@TNSs), were prepared with a large surface area, excellent electron transport, and improved light scattering. The resulting solid-state DSSCs had enhanced efficiency up to 8.4% at 100 mW cm−2.

TiO2 Nanofibers Based Dye-Sensitized Solar Cells

2009 ◽  
Author(s):  
Jinwei Li ◽  
Shiyou Xu ◽  
Yong Shi
Keyword(s):  
Solar Cells ◽  
Surface Area ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Open Circuit ◽  
Electrospinning Process ◽  
Electrical Measurements ◽  
Tio2 Nanofibers ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Dye sensitized solar cells (DSSCs) are promising photovoltaic devices as they offer advantages such as low cost and easy for fabrication et al. The key part of the original DSSC is a sintered film of nanoparticles which has a large surface area for the absorption of dyes. It has been reported that boundaries of nanoparticles diminish the efficiency of charge transport in the nanoparticle network, and lead to charge–carrier recombination. The one dimensional morphology of the nanofiber is believed to improve electron transport efficiency without sacrificing the high specific surface area for the adsorption of dyes. In this paper, TiO2 nanofibers are used to replace TiO2 nanoparticles in the DSSC. The film of nanofibers was synthesized by electrospinning process and collected on the transparent conductive glass substrate. The precursor used for the electrospinning of the nanofiber consists of titanium (IV) isopropoxide, acetate acid, ethanol and polyvinylpyrrolidone(PVP). After the electrospinning process, nanofibers were pretreated at 120°C for 2 hours and annealed at 500°C in atmosphere for another 2 hours. Then DSSC with the film of TiO2 nanofibers were assembled and characterized through electrical measurements. Open circuit voltage of 0.7V and short circuit current densities of 0.45mA/cm2 were achieved.

Influence from Covering TiO2 Nanoparticles with Dense Films upon Electron Transport in Dye-Sensitized Solar Cells

2011 ◽  
Vol 399-401 ◽  
pp. 1399-1402
Author(s):  
Yong De Hao ◽  
Sheng Sheng Song
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Conversion Efficiency ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Dye Sensitized ◽  
Sensitized Solar Cells ◽  
Dense Films

The influence from the dense film coverings generated during the post treatment of TiCl4on the photoelectric conversion efficiency of the dye-sensitized solar cells (DSSCs) is investigated in the present paper. The effect of TiCl4treatment can be concluded into the following two points: 1. Covering TiO2nanoparticles with dense films and protecting the active Ti3+can enhance the electron transport. 2. The dense TiO2 is an ideal conducting film to cover the neck of nanoparticles, reduce the electron scattering and strengthen the electron transport. Acceleration of the electron transport can increase the short circuit current of the DSSCs as to obtain higher photoelectric conversion efficiency.

scholarly journals Hierarchical TiO2 microspheres composed with nanoparticle-decorated nanorods for the enhanced photovoltaic performance in dye-sensitized solar cells

RSC Advances ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 3056-3062 ◽  
Author(s):  
Xiong He ◽  
Jingyu Zhang ◽  
Yan Guo ◽  
Jinghua Liu ◽  
Xin Li
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Dye Sensitized ◽  
Dye Loading ◽  
Tio2 Microspheres ◽  
Sensitized Solar Cells

Hierarchical NP-MS combines the beneficial properties of improved scattering capability, dye loading ability, electron transport and inhibited charge recombination. The photoelectric conversion efficiency up to 7.32% has been obtained.

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