scholarly journals Electrochemical Impedance Spectra of Dye-Sensitized Solar Cells: Fundamentals and Spreadsheet Calculation

2014 ◽  
Vol 2014 ◽  
pp. 1-17 ◽  
Author(s):  
Subrata Sarker ◽  
A. J. Saleh Ahammad ◽  
Hyun Woo Seo ◽  
Dong Min Kim
Keyword(s):  
Solar Cells ◽  
Electrochemical Impedance ◽  
Dye Sensitized Solar Cells ◽  
Transport Processes ◽  
Impedance Spectra ◽  
Electrochemical Impedance Spectra ◽  
Dye Sensitized ◽  
Powerful Approach ◽  
Programming Knowledge ◽  
Sensitized Solar Cells

Electrochemical impedance spectroscopy (EIS) is one of the most important tools to elucidate the charge transfer and transport processes in various electrochemical systems including dye-sensitized solar cells (DSSCs). Even though there are many books and reports on EIS, it is often very difficult to explain the EIS spectra of DSSCs. Understanding EIS through calculating EIS spectra on spreadsheet can be a powerful approach as the user, without having any programming knowledge, can go through each step of calculation on a spreadsheet and get instant feedback by visualizing the calculated results or plot on the same spreadsheet. Here, a brief account of the EIS of DSSCs is given with fundamental aspects and their spreadsheet calculation. The review should help one to develop a basic understanding about EIS of DSSCs through interacting with spreadsheet.

A Light Harvesting Policy on Black Counter Electrode for Enhanced Performance of Dye-Sensitized Solar Cells

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Chi-Hui Chien ◽  
Ming-Lang Tsai ◽  
Chi-Chang Hsieh ◽  
Yan-Huei Li ◽  
Yuh J. Chao
Keyword(s):  
Solar Cells ◽  
Counter Electrode ◽  
Light Harvesting ◽  
Electrochemical Impedance ◽  
Dye Sensitized Solar Cells ◽  
Tio2 Electrode ◽  
Electrochemical Impedance Spectra ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

This work presents a novel light harvesting policy for a black counter electrode (BCE) to enhance the performance of dye-sensitized solar cells (DSSCs), which uses a metal-based light scattering layer (MLSL) that is formed from Al@SiO2 core-shell microflakes prepared and coated on BCE. DSSCs based on BCE with and without the MLSL are compared as well. Analysis results of electrochemical impedance spectra (EIS) indicate that, while not affecting the charge transfer resistance at BCE, MLSL exhibits a low electron transport resistance in the TiO2/electrolyte interface. Our results further demonstrate that MLSL reflects light to the TiO2 electrode, subsequently increasing photocurrent density by 68.68% (from 2.65 to 4.47 mA/cm2) and improving the power conversion efficiency by 49.64%.

scholarly journals Alkali Iodide Deep Eutectic Solvents as Alternative Electrolytes for Dye Sensitized Solar Cells

2021 ◽  
Vol 2 (2) ◽  
pp. 222-236
Author(s):  
Hugo Cruz ◽  
Ana Lucia Pinto ◽  
Noémi Jordão ◽  
Luísa A. Neves ◽  
Luís C. Branco
Keyword(s):  
Solar Cells ◽  
Current Density ◽  
Electrochemical Impedance ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Deep Eutectic Solvents ◽  
Transport Processes ◽  
Experimental Conditions ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Different alkali deep eutectic solvents (DES), such as LiI:nEG, NaI:nEG, and KI:nEG, have been tested as electrolytes for dye sensitized solar cells (DSSCs). These DSSCs were prepared using pure DES or, alternatively, DES combined with different amounts of iodine (I2). The most important parameters, such as open circuit voltage (VOC), short circuit current density (JSC), fill factor (FF), and the overall conversion efficiency (η), were evaluated. Some DES seem to be promising candidates for DSSC applications, since they present higher VOC (up to 140 mV), similar FF values but less current density values, when compared with a reference electrolyte in the same experimental conditions. Additionally, electrochemical impedance spectroscopy (EIS) has been performed to elucidate the charge transfer and transport processes that occur in DSSCs. The values of different resistance (Ω·cm2) phenomena and recombination/relaxation time (s) for each process have been calculated. The best-performance was obtained for DES-based electrolyte, KI:EG (containing 0.5 mol% I2) showing an efficiency of 2.3%. The efficiency of this DES-based electrolyte is comparable to other literature systems, but the device stability is higher (only after seven months the performance of the device drop to 60%).

TiO2 NANOTUBE AS ADDITIVE TO TiO2 FILM FOR IMPROVING PERFORMANCE OF DYE-SENSITIZED SOLAR CELLS

2010 ◽  
Vol 09 (04) ◽  
pp. 301-305
Author(s):  
X. D. LI ◽  
D. W. ZHANG ◽  
Z. A. WANG ◽  
Z. SUN ◽  
S. M. HUANG ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Electrochemical Impedance ◽  
Dye Sensitized Solar Cells ◽  
Dye Adsorption ◽  
Adsorption Properties ◽  
Outer Diameter ◽  
Electrochemical Impedance Spectra ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

The titanium dioxide nanotubes (TiNTs) were directly prepared from commercial P25 TiO2 powder via alkali hydrothermal transformation. The fabricated nanotubes had an average outer diameter of 8–10 nm and the inner diameter of 4–6 nm with several hundred nanometers in length. The prepared nanotubes were added into TiO2 nanoporous electrodes for the fabrication of dye-sensitized solar cells (DSCs). The photoelectrochemical characteristics and dye-adsorption properties were investigated by varying the proportion of the nanotubes incorporated into TiO2 working electrodes. The electron transport resistance, electron life time, and dye adsorption properties were evaluated in terms of electrochemical impedance spectra and photovoltaic characteristics of the solar cells. Compared to DSCs based on TiO2 nanoparticles, the fill factor, open-voltage, and photocurrent based on TiNT /P25 hybrid increased significantly. High conversion efficiency of light-to-electricity of 7.41% under illumination of simulated AM 1.5 sunlight (100 mW/cm2) was achieved for DSCs using optimized proportions of TiO2 nanotubes incorporated into TiO2 electrodes. The studies provided a promising method for the development of high efficiency and low cost DSCs.

Analysis of Charge Transport and Recombination Studied by Electrochemical Impedance Spectroscopy for Dye-sensitized Solar Cells With Atomic Layer Deposited Metal Oxide Treatment on TiO2 Surface

2010 ◽  
Vol 1270 ◽  
Author(s):  
Braden Bills ◽  
Mariyappan Shanmugam ◽  
Mahdi Farrokh Baroughi ◽  
David Galipeau
Keyword(s):  
Solar Cells ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Atomic Layer ◽  
Back Reaction ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

AbstractThe performance of dye-sensitized solar cells (DSSCs) is limited by the back-reaction of photogenerated electrons from the porous titanium oxide (TiO2) nanoparticles back into the electrolyte solution, which occurs almost exclusively through the interface. This and the fact that DSSCs have a very large interfacial area makes their performance greatly dependant on the density and activity of TiO2 surface states. Thus, effectively engineering the TiO2/dye/electrolyte interface to reduce carrier losses is critically important for improving the photovoltaic performance of the solar cell. Atomic layer deposition (ALD), which uses high purity gas precursors that can rapidly diffuse through the porous network, was used to grow a conformal and controllable aluminum oxide (Al2O3) and hafnium oxide (HfO2) ultra thin layer on the TiO2 surface. The effects of this interfacial treatment on the DSSC performance was studied with dark and illuminated current-voltage and electrochemical impedance spectroscopy (EIS) measurements.

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.

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