scholarly journals Efficiency Enhancement of Cocktail Dye of Ixora coccinea and Tradescantia spathacea in DSSC

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Zularif Zolkepli ◽  
Andery Lim ◽  
Piyasiri Ekanayake ◽  
Kushan Tennakoon
Keyword(s):  
Storage Temperature ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Visible Region ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Cell Efficiency ◽  
Average Size ◽  
Ixora Coccinea

The use of anthocyanin dyes extracted from epidermal leaves of Tradescantia spathacea (Trant) and petals of Ixora coccinea (IX) was evaluated in the application of dye-sensitized solar cells (DSSCs). Subsequently, cocktail anthocyanin dyes from these dyes were prepared and how they enhanced the cell’s overall performance was assessed using five different volume-to-volume ratios. Cocktail dyes absorbed a wider range of light in the visible region, thus increasing the cell efficiencies of the cocktail dyes when compared to the DSSC sensitized by individual dyes. The surface charge (zeta-potential), average size of aggregated anthocyanin molecules (zetasizer), and anthocyanin stability in different storage temperatures were analyzed and recorded. Lower size of aggregated dye molecules as revealed from the cocktail dyes ensured better adsorption onto the TiO2 film. Tradescantia/Ixora pigments mixed in 1 : 4 ratio showed the highest cell efficiency of η=0.80%, under the irradiance of 100 mW cm−2, with a short-circuit current density 4.185 mA/cm2, open-circuit voltage of 0.346 V, and fill factor of 0.499. It was found that the desired storage temperature for these cocktail dyes to be stable over time was −20°C, in which the anthocyanin half-life was about approximately 1727 days.

scholarly journals A Facile Synthesis of Granular ZnO Nanostructures for Dye-Sensitized Solar Cells

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Md. Mahbubur Rahman ◽  
Narayan Chandra Deb Nath ◽  
Kwang-Mo Noh ◽  
Jaecheon Kim ◽  
Jae-Joon Lee
Keyword(s):  
Low Cost ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Surface States ◽  
Short Circuit Current ◽  
Energy Conversion Efficiency ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Zno Nanostructures ◽  
Average Size

Granular ZnO nanostructures of single-crystalline wurtzite hexagonal phases were synthesized by a facile and low-cost chemical method in aqueous condition. The average size of ZnO nanograin increased with reflux time, and it significantly affected the open circuit potential(Voc)while the short circuit current density(Jsc)was not changed much. The overall energy conversion efficiency was 1.82% with the smaller grain size ofca.250 nm when it was used as photoelectrode of DSSCs. The positive shifting of the Fermi energy (EF) and low density of surface states (DOS) were consistent with the reduction of the recombination of excited electron with electrolyte for smaller grains.

scholarly journals CdTe-Based Thin Film Solar Cells: Past, Present and Future

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1684
Author(s):  
Alessandro Romeo ◽  
Elisa Artegiani
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Solar Cell ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Early Years ◽  
Solar Cell Efficiency ◽  
Cell Efficiency

CdTe is a very robust and chemically stable material and for this reason its related solar cell thin film photovoltaic technology is now the only thin film technology in the first 10 top producers in the world. CdTe has an optimum band gap for the Schockley-Queisser limit and could deliver very high efficiencies as single junction device of more than 32%, with an open circuit voltage of 1 V and a short circuit current density exceeding 30 mA/cm2. CdTe solar cells were introduced at the beginning of the 70s and they have been studied and implemented particularly in the last 30 years. The strong improvement in efficiency in the last 5 years was obtained by a new redesign of the CdTe solar cell device reaching a single solar cell efficiency of 22.1% and a module efficiency of 19%. In this paper we describe the fabrication process following the history of the solar cell as it was developed in the early years up to the latest development and changes. Moreover the paper also presents future possible alternative absorbers and discusses the only apparently controversial environmental impacts of this fantastic technology.

IMPROVING STABILITY OF CHLOROPHYLL AS NATURAL DYE FOR DYE-SENSITIZED SOLAR CELLS

2017 ◽  
Vol 80 (1) ◽  
Author(s):  
Zainal Arifin ◽  
Sudjito Soeparman ◽  
Denny Widhiyanuriyawan ◽  
Suyitno Suyitno ◽  
Argatya Tara Setyaji
Keyword(s):  
Current Density ◽  
Open Circuit Voltage ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Natural Dyes ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Natural dyes have attracted much researcher’s attention due to their low-cost production, simple synthesis processes and high natural abundance. However the dye-sensitized solar cells (DSSCs) based natural dyes have higher tendency to degradation. This article reports on the enhancement of performance and stability of dye-sensitized solar cells (DSSCs) using natural dyes. The natural dyes were extracted from papaya leaves by ethanol solvent at a temperature of 50 °C. Then the extracted dyes were isolated and modified into Mg-chlorophyll using column chromatography. Mg-chlorophyll was then synthesized into Fe-chlorophyll to improve stability. The natural dyes were characterized using ultraviolet-visible spectrometry, Fourier transform infrared spectroscopy, and cyclic voltammetry. The performance of DSSCs was tested using a solar simulator. The results showed the open-circuit voltage, the short-circuit current density, and the efficiency of the extracted papaya leaves-based DSSCs to be 325 mV, 0.36 mA/cm2, and 0.07%, respectively. Furthermore, the DSSCs with purified chlorophyll provide high open-circuit voltage of 425 mV and short-circuit current density of 0.45 mA/cm2. The use of Fe-chlorophyll for sensitizing the DSSCs increases the efficiency up to 2.5 times and the stability up to two times. The DSSCs with Fe-chlorophyll dyes provide open-circuit voltage, short-circuit current density, and efficiency of 500 mV, 0.62 mA/cm2, and 0.16%, respectively. Further studies to improve the current density and stability of natural dye-based DSSCs along with an improvement in the anchor between dyes and semiconducting layers are required.

scholarly journals Photoactive Layer of DSSCS Based on Natural Dyes: A Study of Experiment and Theory

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Yuanzuo Li ◽  
Huixing Li ◽  
Peng Song ◽  
Chaofan Sun
Keyword(s):  
Density Functional ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Natural Dyes ◽  
Pheophytin A ◽  
Charge Difference Density ◽  
Forsythia Suspensa

Three natural dyes (Forsythia suspensa, Herba Violae, and Corn leaf) have been investigated as potential sensitizers for dye-sensitized solar cells. UV-vis absorption spectra reveal that three natural dyes mainly contain the compound of pheophytin a. Among three DSSCs, the highest photo electronic conversion efficiencyηis 0.96% with open circuit voltage (VOC) of 0.66 V, short circuit current density (ISC ) of 1.97 mA cm−2, and fill factor (ff) of 0.74. Theoretical time-dependent density functional theory and charge difference density are used to explore the nature of excited states. Results demonstrate that the first state is an intramolecular charge transfer (ICT) state, and electron injection could occur owing to the thermodynamically driving force.

Synthesis and Dye-sensitized Solar Cell Application of Polyolefinic Aromatic Molecules with Pyrene as Surface Group

2011 ◽  
Vol 64 (7) ◽  
pp. 951 ◽  
Author(s):  
Perumal Rajakumar ◽  
Kathiresan Visalakshi ◽  
Shanmugam Ganesan ◽  
Pichai Maruthamuthu ◽  
Samuel Austin Suthanthiraraj
Keyword(s):  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Surface Group ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Solar Cell Application ◽  
Aromatic Molecules ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Synthesis of polyolefinic aromatic molecules with pyrene as the surface group, and their role as an additive in the redox couple of dye-sensitized solar cells, is described. The studies yield a promising power conversion efficiency of 5.27% with a short circuit current density of 6.50 mA cm–2, an open circuit voltage of 0.60 V, and a fill factor of 0.54 under 40 mW cm–2 simulated air mass (A.M.) 1.5 illumination. Most importantly, the photocurrent responsivity increases with an increase in the number of pyrene units on the surface.

Characteristics of Dye-Sensitized Solar Cells Using Dye from Pitaya Fruit

2015 ◽  
Vol 793 ◽  
pp. 450-454 ◽  
Author(s):  
N. Gomesh ◽  
R. Syafinar ◽  
Muhamad Irwanto ◽  
Y.M. Irwan ◽  
M. Fareq ◽  
...  
Keyword(s):  
Solar Cell ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Liquid Electrolyte ◽  
Open Circuit ◽  
Dye Sensitized Solar Cell ◽  
Photoelectrochemical Performance ◽  
Cell Efficiency ◽  
Dye Sensitized

Dye-sensitized solar cell (DSSC) consists of TiO2 nanoporous coating which acts as a photo electrode, a sensitizer of dye molecules soaked in the TiO2 film, liquid electrolyte and a counter electrode. This paper focuses on the usage of a sensitizer from the Pitaya fruit. Pitaya or commonly known as dragon fruit (Hylocereus polyrhizus) was extracted and used as a sensitizer to fabricate the dye sensitized solar cell (DSSC). The photoelectrochemical performance of Pitaya based solar cell shows an open circuit voltage (VOC) of 237 mV, short circuit current (ISC) of 4.98 mA, fill factor (FF) of 0.51, solar cell efficiency (η) of 0.70 % and has a peak absorbance rate of 2.7 at 550 nm. The photoelectrochemical and UV-Visible light absorbance performance of Pitaya-DSSC shows good potential in future solar cell fabrication.

Fabrication of a Dye Sensitized Solar Cell and Its Performance Dependence on Temperature and Irradiance

2011 ◽  
Author(s):  
Edwin Peng ◽  
Halil Berberoglu
Keyword(s):  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Dye Sensitized ◽  
Current Voltage ◽  
Nanocrystalline Titanium ◽  
Increasing Temperature ◽  
Sensitized Solar Cells

This paper reports the temperature and irradiance dependence of dye-sensitized solar cells (DSSCs) with acetonitrile-based electrolytes. The prototyped DSSCs had nanocrystalline titanium dioxide photoanodes and platinum thin film cathode. The photoanodes were sensitized with N-749 dye. The current-voltage characteristics of the DSSCs were measured at temperatures from 5 to 50 °C and under 500, 1000, and 1500 W m−2 irradiance. The open circuit voltage, VOC, decreased linearly with increasing temperature and had positive, logarithmic relation with irradiance. At temperatures lower than 15 °C, short circuit current density, JSC, was limited by the diffusion of I3− in the electrolyte and increased with increasing temperature. At higher temperatures the recombination of electrons injected into the TiO2 conduction band was dominant over diffusion and JSC decreased with increasing temperature. Moreover, JSC increaed linearly with increasing irradiance. The DSSC photoconversion efficiency did not vary appreciably at temperatures lower than 15 °C but decreased with increasing temperature. Finally, the efficiency increased with increasing irradiance.

scholarly journals Performance Degradation of Dye-Sensitized Solar Cells Induced by Electrolytes

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Ru-Yuan Yang ◽  
Huang-Yu Chen ◽  
Fu-Der Lai
Keyword(s):  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Dye Sensitized ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Sensitized Solar Cells ◽  
Open Circuit Photovoltage

We investigated the change of the electric characteristics in dye-sensitized solar cell (DSSC) when the electrolyte has been injected and measured initially and lately for a period of time. It was found that the short-circuit current density decreased from 9.799 mA/cm2to 7.056 mA/cm2and the fill factor increased from 0.406 to 0.559 when the cell had stood for an hour, while the open-circuit photovoltage did not change due to fixed difference between the Fermi level of TiO2and the oxidation-reduction potential of electrolyte. The results can be explained by using the variation of the series resistance in the equivalent circuit of the DSSC.

Simulation of Symmetrically Doped Silicon Nanowire Solar Cells

2011 ◽  
Vol 1322 ◽  
Author(s):  
Felix Voigt ◽  
Thomas Stelzner ◽  
Silke H. Christiansen
Keyword(s):  
Solar Cells ◽  
Short Circuit ◽  
Silicon Nanowire ◽  
Short Circuit Current ◽  
Cylindrical Symmetry ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Back Surface ◽  
Cell Efficiency ◽  
P Type

ABSTRACTSilicon nanowire solar cells were simulated using the Silvaco TCAD software kit. For optimization of speed the simulations were performed in cylinder coordinates with cylindrical symmetry. Symmetric doping was assumed with a dopant density of 1018 cm-3 in the p-type core and inside the n-type shell. In the implementation a cathode contact was wrapped around the semiconductor nanorod and an anode was assumed at the bottom of the rod. Optimization of cell efficiency was performed with regard to the rod radius and the rod length. In both optimization processes clear maxima in efficiency were visible, resulting in an optimal radius of 66 nm with the pn junction at 43.5 nm and an optimal rod length of about 48 μm. The maximum of efficiency with respect to the rod radius is due to a decrease of short-circuit current density (Jsc) and an increase of open-circuit voltage (Uoc) with radius, while the maximum with respect to the rod length is explained by the combination of an increase of Jsc and a decrease of Uoc. Fill factors stay rather constant at values between 0.6 and 0.8. Further, the influence of a back surface field (BSF) layer was surveyed in simulations. Positioning the BSF next to the cathode contact considerably improved cell efficiency. In addition, simulations with a cathode contact on top of the nanowire structure were undertaken. No severe deterioration of cell performance with increasing radius was observed so far in this configuration. Hence, nanorods with much larger radii can be used for solar cells using this contact scheme. In comparison to simulations with wrapped cathode contacts, Jsc and Uoc and therefore efficiency is considerably improved.

scholarly journals Efficiency enhancement of natural dye sensitized solar cell by optimizing electrode fabrication parameters

2018 ◽  
Vol 35 (4) ◽  
pp. 816-823 ◽  
Author(s):  
M. Khalid Hossain ◽  
M.F. Pervez ◽  
S. Tayyaba ◽  
M. Jalal Uddin ◽  
A.A. Mortuza ◽  
...  
Keyword(s):  
Solar Cell ◽  
Counter Electrode ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Dye Sensitized Solar Cell ◽  
Cell Efficiency ◽  
Dye Sensitized ◽  
Candle Flame

Abstract Efficiency of dye-sensitized solar cell (DSSC) depends on several interrelated factors such as type and concentration of dye, type and thickness of photoelectrode and counter electrode. Optimized combination of these factors leads to a more efficient cell. This paper presents the effect of these parameters on cell efficiency. TiO2 nanoporous thin films of different thicknesses (5 μm to 25 μm) were fabricated on indium doped tin oxide (ITO) coated glass by doctor blading method and characterized by inverted microscope, stylus surface profiler and scanning electron microscope (SEM). Natural organic dye of different concentrations, extracted from turmeric, was prepared with ethanol solvent. Different combinations of dye concentrations and film thicknesses along with different types of carbon catalyst have been investigated by I-V characterization. The result shows that the cell made of a counter electrode catalyst material prepared by candle flame carbon combined with about 15 μm thick photoelectrode and 100 mg/mL dye in ethanol solvent, achieves the highest efficiency of 0.45 %, with open circuit voltage of 566 mV and short circuit current density of 1.02 mA/cm2.

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