Parameter Study on UV-induced Degradation of Dye-sensitized Solar Cells

2013 ◽  
Vol 1537 ◽  
Author(s):  
Katrine Flarup Jensen ◽  
Welmoed Veurman ◽  
Henning Brandt ◽  
Chan Im ◽  
Jürgen Wilde ◽  
...  
Keyword(s):  
Dye Sensitized Solar Cells ◽  
Electrical Characterization ◽  
Side Reaction ◽  
Electrical Impedance Spectroscopy ◽  
Parameter Study ◽  
Dye Sensitized ◽  
Uv Illumination ◽  
Hydrogen Bubbles ◽  
Production Of Hydrogen ◽  
Cell Current

ABSTRACTThe present work investigates the UV stability of the dye-sensitized solar cell (DSC) by parametrical investigation of the material influence on UV stability. UV illumination has been observed to cause degradation by slow photocatalysis in the DSC. Photooxidized impurities represent an unwanted side reaction with the redox pair of the electrolyte as the released electron will deplete the triiodide concentration. A study on the DSC cell was carried out with intermediate electrical characterization by cyclic voltammetry (CV) and electrical impedance spectroscopy (EIS) to map the influence of UV illumination as a function of the H2O concentration in the electrolyte, the plate distance and the triiodide concentration. The results show that the H2O content has a detrimental influence on the DSC stability during UV illumination. A higher concentration of triiodide can buffer the reaction with impurities, so that a longer-term stability is achieved. A recovery of triiodide in UV aged cells with either no remaining triiodide or with such a low concentration that the cell current has been diffusionlimited, was seen during CV to -0.75 V under illumination. The reappearance of triiodide was accompanied with a production of hydrogen bubbles, which was related to the H2O content in the electrolyte and the exposure to UV. Our approach can be used to test the purity and the UV stability of various electrolytes.

scholarly journals Impedance Spectroscopic Investigation of the Degraded Dye-Sensitized Solar Cell due to Ageing

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Parth Bhatt ◽  
Kavita Pandey ◽  
Pankaj Yadav ◽  
Brijesh Tripathi ◽  
Manoj Kumar
Keyword(s):  
Current Density ◽  
Open Circuit Voltage ◽  
Electrochemical Impedance ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Electrical Characterization ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Conduction Band Edge ◽  
Dye Sensitized

This paper investigates the effect of ageing on the performance of dye-sensitized solar cells (DSCs). The electrical characterization of fresh and degraded DSCs is done under AM1.5G spectrum and the current density-voltage (J-V) characteristics are analyzed. Short circuit current density (JSC) decreases significantly whereas a noticeable increase in open circuit voltage is observed. These results have been further investigated electroanalytically using electrochemical impedance spectroscopy (EIS). An increase in net resistance results in a lower JSC for the degraded DSC. This decrease in current is mainly due to degradation of TiO2-dye interface, which is observed from light and dark J-V characteristics and is further confirmed by EIS measurements. A reduction in the chemical capacitance of the degraded DSC is observed, which is responsible for the shifting of Fermi level with respect to conduction band edge that further results in an increase of open circuit voltage for the degraded DSC. It is also confirmed from EIS that the degradation leads to a better contact formation between the electrolyte and Pt electrode, which improves the fill factor of the DSC. But the recombination throughout the DSC is found to increase along with degradation. This study suggests that the DSC should be used under low illumination conditions and around room temperature for a longer life.

PALLADIUM(II)-PORPHYRIN COMPLEXES AS EFFICIENT SENSITIZERS FOR SOLAR ENERGY CONVERSION

2021 ◽  
Vol 21 (2) ◽  
pp. 557-568
Author(s):  
LIVIU OLTEANU ◽  
RODICA-MARIANA ION ◽  
RALUCA-MARIA STIRBESCU ◽  
SOFIA TEODORESCU ◽  
DORIN-DACIAN LET ◽  
...  
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Visible Region ◽  
Electrical Characterization ◽  
Conducting Oxides ◽  
Dye Sensitized ◽  
Transparent Conducting ◽  
Tetraphenyl Porphyrin ◽  
Silicon Based ◽  
Sensitized Solar Cells

The dye-sensitized solar cells (DSSC) and thin-layer heterojunctional solar cells have attracted much attention as an alternative to relatively expensive silicon-based solar cells. Among the various photosensitizers used to build these cells, porphyrins have proven to be outstanding candidates due to their strong absorption in the visible region and have established basic and peripheral modification methods to adjust their geometry and electronic structures. Due to the improved spectral properties, the electronic spectra of these materials have been extensively studied. In this paper, the information obtained using both ultraviolet-visible (UV-VIS) and Fourier Transform Infrared (FTIR) spectroscopy have been used to evaluate the use of Pd-TPP (palladium-5,10,15,20-tetraphenyl porphyrin) as sensitizer dye on different glass substrate coated with transparent conducting oxides. The electrical characterization and quantum efficiency results, related with Pd-TPP-sensitized heterojunctional supramolecular solar cells, are also highlighted.

Morphological, optical and electrical characterization of titania-nanotubes-based dye-sensitized solar cells

Solar Energy ◽  
2016 ◽  
Vol 127 ◽  
pp. 232-238 ◽  
Author(s):  
Luka Suhadolnik ◽  
Ivan Jerman ◽  
Amadej Kujan ◽  
Kristina Žagar ◽  
Matic Krivec ◽  
...  
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Electrical Characterization ◽  
Titania Nanotubes ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

scholarly journals Effects of Homogenization Scheme ofTiO2Screen-Printing Paste for Dye-Sensitized Solar Cells

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Seigo Ito ◽  
Kaoru Takahashi ◽  
Shin-ich Yusa ◽  
Takahiro Imamura ◽  
Kenji Tanimoto
Keyword(s):  
Solar Cells ◽  
Ball Milling ◽  
Screen Printing ◽  
Dye Sensitized Solar Cells ◽  
Photocurrent Density ◽  
Porous Electrodes ◽  
Electrical Impedance Spectroscopy ◽  
Photoconversion Efficiency ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

TiO2porous electrodes have been fabricated for photoelectrodes in dye-sensitized solar cells (DSCs) using TiO2screen-printing paste from nanocrystalline TiO2powder dried from the synthesized sol. We prepared the TiO2screen-printing paste by two different methods to disperse the nanocrystalline TiO2powder: a “ball-milling route” and a “mortal-grinding route.” The TiO2ball-milling (TiO2-BM) route gave monodisperse TiO2nanoparticles, resulting in high photocurrent density (14.2 mA cm−2) and high photoconversion efficiency (8.27%). On the other hand, the TiO2mortal-grinding (TiO2-MG) route gave large aggregate of TiO2nanoparticles, resulting in low photocurrent density (11.5 mA cm−2) and low photoconversion efficiency (6.43%). To analyze the photovoltaic characteristics, we measured the incident photon-to-current efficiency, light absorption spectroscopy, and electrical impedance spectroscopy of DSCs.

Morphological and electrical characterization of ZnO nanocomposites in dye-sensitized solar cells

2011 ◽  
Vol 3 (5) ◽  
pp. 059101 ◽  
Author(s):  
G. Rey ◽  
N. Karst ◽  
B. Doisneau ◽  
H. Roussel ◽  
P. Chaudouet ◽  
...  
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Electrical Characterization ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Fabrication of TiO2 Nanobelt Network for Dye-Sensitized Solar Cells

2009 ◽  
Vol 1167 ◽  
Author(s):  
Haiyan Li ◽  
Jun Jiao
Keyword(s):  
Solar Cells ◽  
Anode Materials ◽  
Dye Sensitized Solar Cells ◽  
Electrical Characterization ◽  
Annealing Process ◽  
Simulated Sunlight ◽  
Erosion Process ◽  
Raman Analysis ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

AbstractInterconnected TiO2 nanobelt networks were prepared to serve as anode materials. The aim is to enhance the electron transport through the anode of dye-sensitized solar cells. Using an alkaline hydrothermal procedure and by controlling the reaction time, two kinds of nanostructures were synthesized: TiO2 nanobelts and the mixture of TiO2 nanobelts/TiO2 nanoparticles. This investigation suggests that TiO2 nanobelts are the result of the rearrangement of the [Ti(OH)6]2- monomers formed during the erosion process of TiO2 nanoparticles. The nanostructures of as-synthesized nanobelts were woven and interconnected, resulting in networks after an annealing process. Raman analysis indicates that both kinds of nanostructures were pure anatase. Electrical characterization suggests that the conductivities of these TiO2 nanobelt networks were higher than those of the TiO2 nanoparticle films. Under simulated sunlight with an intensity of AM 1.5 G, the solar cells made of TiO2 nanobelt networks show exceptional photocurrent in comparison to those made of TiO2 nanoparticles.

scholarly journals Sol-Gel Processed TiO2 Nanotube Photoelectrodes for Dye-Sensitized Solar Cells with Enhanced Photovoltaic Performance

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 296 ◽  
Author(s):  
Nikolai Tsvetkov ◽  
Liudmila Larina ◽  
Jeung Ku Kang ◽  
Oleg Shevaleevskiy
Keyword(s):  
Solar Cells ◽  
Sol Gel ◽  
Dye Sensitized Solar Cells ◽  
Electrical Impedance Spectroscopy ◽  
Tio2 Nps ◽  
Doped Tio2 ◽  
Dye Sensitized ◽  
Electrolyte Interface ◽  
Tio2 Nts ◽  
Sensitized Solar Cells

The performance of dye-sensitized solar cells (DSCs) critically depends on the efficiency of electron transport within the TiO2-dye-electrolyte interface. To improve the efficiency of the electron transfer the conventional structure of the working electrode (WE) based on TiO2 nanoparticles (NPs) was replaced with TiO2 nanotubes (NTs). Sol-gel method was used to prepare undoped and Nb-doped TiO2 NPs and TiO2 NTs. The crystallinity and morphology of the WEs were characterized using XRD, SEM and TEM techniques. XPS and PL measurements revealed a higher concentration of oxygen-related defects at the surface of NPs-based electrodes compared to that based on NTs. Replacement of the conventional NPs-based TiO2 WE with alternative led to a 15% increase in power conversion efficiency (PCE) of the DSCs. The effect is attributed to the more efficient transfer of charge carriers in the NTs-based electrodes due to lower defect concentration. The suggestion was confirmed experimentally by electrical impedance spectroscopy measurements when we observed the higher recombination resistance at the TiO2 NTs-electrolyte interface compared to that at the TiO2 NPs-electrolyte interface. Moreover, Nb-doping of the TiO2 structures yields an additional 14% PCE increase. The application of Nb-doped TiO2 NTs as photo-electrode enables the fabrication of a DSC with an efficiency of 8.1%, which is 35% higher than that of a cell using a TiO2 NPs. Finally, NTs-based DSCs have demonstrated a 65% increase in the PCE value, when light intensity was decreased from 1000 to 10 W/m2 making such kind device be promising alternative indoor PV applications when the intensity of incident light is low.

scholarly journals Dye Sensitized Solar Cells Based on Commelino nudiflora as Sensitizer

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Adenike Boyo
Keyword(s):  
Solar Cells ◽  
Optical Absorption ◽  
Dye Sensitized Solar Cells ◽  
Electrical Characterization ◽  
Solvent System ◽  
Visible Range ◽  
Solar Simulator ◽  
Dye Sensitized ◽  
Internal Parameters ◽  
Sensitized Solar Cells

Natural dyes extracted from the leaves and flowers of Commelino nudiflora was utilized as sensitizer in dye sensitized solar cells (DSSCs) by using a solvent system of distilled water, methanol and M HNO3 in the ratio 10: 9: 1. Also, the crude extract was purified to obtain anthocyanins from the leaves and flowers. Optical characterizations of the dyes were conducted by using UV-vis absorption and electrical characterization was determined using a solar simulator. Optical absorption for the crude extracts indicates an absorption in the visible range (400 nm) with the leaves extract showing better absorbance. Optical absorption for the purified extracts indicates the leaves extract has better absorbance though they show similar pattern. The crude flower extract has the highest efficiency of 0.00389 %. The characteristics of the dye-sensitized solar cell (DSSC) has been simulated using MATLAB based on TiO2 by modifying the internal parameters. The simulated results show that the crude and purified extracts for the leaves showed a better power conversion efficiency in comparison to the flower extracts.

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