scholarly journals Enhanced Performance of DSSCs Based on the Insertion Energy Level of CdS Quantum Dots

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaoping Zou ◽  
Zhe Sun
Keyword(s):  
Quantum Dots ◽  
Short Circuit ◽  
Energy Levels ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Cds Quantum Dots ◽  
Visible Absorption ◽  
The Times

Cadmium sulfide (CdS) quantum dots (QDs) are assembled onto the TiO2films by chemical bath deposition method (CBD). And the QDs size is controlled by the times of CBD cycles. They are characterized by UV-visible absorption. To avoid the photo corrosion and electrolyte corrosion, CdS and N719 are sequentially assembled onto the nanocrystalline TiO2films to prepare a CdS/N719 cosensitized photo electrode for the dye-sensitized solar cells. In the structure of TiO2/CdS/N719 electrode, the reorganization of energy levels between CdS and N719 forms a stepwise structure of band-edge levels which is advantageous to the electron injection and hole recovery of CdS and N719 QDs. The open circuit voltage (Voc), short circuit current density (Jsc), and efficiency are increased.

scholarly journals Superior Photocurrent of Quantum Dot Sensitized Solar Cells Based on PbS : In/CdS Quantum Dots

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Zongbo Huang ◽  
Xiaoping Zou
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Quantum Dot ◽  
Short Circuit ◽  
Energy Levels ◽  
Short Circuit Current ◽  
Energy Conversion Efficiency ◽  
Short Circuit Current Density ◽  
Cds Quantum Dots ◽  
Sensitized Solar Cells

PbS : In and CdS quantum dots (QDs) are sequentially assembled onto a nanocrystalline TiO2film to prepare a PbS : In/CdS cosensitized photoelectrode for QD sensitized solar cells (QDSCs). The results show that PbS : In/CdS QDs have exhibited a significant effect in the light harvest and performance of the QDSC. In the cascade structure of the electrode, the reorganization of energy levels between PbS and TiO2forms a stepwise structure of band-edge levels which is advantageous to the electron injection into TiO2. Energy conversion efficiency of 2.3% is achieved with the doped electrode, under the illumination of one sun (AM1.5, 100 mW cm2). Besides, a remarkable short circuit current density (up to 23 mA·cm−2) is achieved in the resulting PbS : In/CdS quantum dot sensitized solar cell, and the related mechanism is discussed.

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.

Performance of Dye-Sensitized Solar Cells Using ZnO-Natural Dyes from Sappan Wood, Noni Leaves, Safflower and Black Rice

2013 ◽  
Vol 658 ◽  
pp. 25-29
Author(s):  
Rathanawan Magaraphan ◽  
Jaruwan Joothamongkhon
Keyword(s):  
Solar Cells ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Natural Dyes ◽  
Zno Nanoparticle ◽  
Black Rice ◽  
Visible Absorption ◽  
Dye Sensitized

Four natural dyes from sappan wood, noni leaves, safflower and black rice show 4 different colors, red, green, yellow and dark purple. They were extracted by water/ethanol and used as a sensitizer for the ZnO based dye-sensitized solar cell (DSSC). UV-Visible absorption revealed high extinction coefficients of the safflower, noni leaves and sappan wood while the black rice was opposite. And they were adsorbed on ZnO nanoparticles as suggested by the change in absorption spectrum of ZnO. SEM results showed the ZnO nanoparticle-porous film of 9 micron thick. I-V measurement showed both low short circuit current and open circuit voltage leading to poor fill factor. As a result, the efficiencies of the fabricated solar cells were 0.00165, 0.05865, 0.00007 and 0.00015% for sappan wood, noni leaves, safflower and black rice DSSCs, respectively.

Deposition Voltage Research of CdSe Quantum Dots Sensitized TiO2 Solar Cell

2015 ◽  
Vol 1118 ◽  
pp. 182-185
Author(s):  
Liu Ying Zhao ◽  
Fu Fang Zhou ◽  
Peng Hu ◽  
Song Jie Han ◽  
Ping Wang
Keyword(s):  
Quantum Dots ◽  
Solar Cell ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Semiconductor Film ◽  
Cdse Quantum Dots ◽  
Deposition Voltage ◽  
Nanocrystalline Semiconductor

TiO2nanocrystalline semiconductor film was made on the titanium (Ti) substrate by hydrothermal method,and then prepared the CdSe quantum dot layer on the face of the TiO2nanocrystalline semiconductor film by electrochemical deposition method. We studied the affect of deposition voltage of the CdSe quantum dots’ growth, finding that when the deposition voltage was-1.3V,CdSe quantum dots grown best.However, In terms of CdSe/TiO2as the light-anode,using electricity chemistry workstation to test,We gain a solar cell with Short circuit current density of 1.45×10-3A·cm-2and the open circuit voltage of 0.24 V.

scholarly journals Optical Property and Photoelectrical Performance of a Low-bandgap Conducting Polymer Incorporated with Quantum Dots Used for Organic Solar Cells

2015 ◽  
Vol 25 (2) ◽  
pp. 139
Author(s):  
Tran Thi Thao ◽  
Vu Thi Hai ◽  
Nguyen Nang Dinh ◽  
Le Dinh Trong
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
Fill Factor ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Low Bandgap ◽  
A Value

By using spin-coating technique, a low bandgap conjugated polymer, poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopen-ta[2,1-b;3,4-b′]dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT)  and its composite thin films have been prepared. The optical absorption and photoconductive properties with over a wide spectral range, from 350 to 950  nm, were characterized. The obtained results showed that PCPDTBT:10 wt% CdSe  composite is the most suitable for efficient light-harvesting in polymer-based photovoltaic cells. The photoelectrical conversion efficiency (PCE) of the device with  a multilayer structure of ITO/PEDOT/ PCPDTBT:CdSe /LiF/Al  reached a value as large as 1.34% with an open-circuit voltage (Voc) = 0.57 V, a short-circuit current density (Jsc) = 4.29 mA/cm2, and a fill factor (FF) = 0.27. This suggests a useful application in further fabrication of quantum dots/polymers based solar cells.

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.

The Preparation of TiO2 Nanotube by ZnO Nanorod Template Method and Application in Dye-Sensitized Solar Cells

2014 ◽  
Vol 602-603 ◽  
pp. 888-892
Author(s):  
Yan Xiang Wang ◽  
Yu Hong Ye ◽  
Jian Sun
Keyword(s):  
Seed Layer ◽  
Short Circuit ◽  
Zno Nanorods ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Immersion Method ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Titanium dioxide (TiO2) nanotubes film was deposited on conducting glass oxide (FTO) by using ZnO nanorods as template, and the TiO2nanotubes film was applied in DSCs. First, ZnO nanorods were fabricated on ZnO-doped TiO2seed layer coated substrates by the hydrothermal method. Second, the obtained ZnO nanorods were used as a template to synthesize ZnOTiO2coreshell structure through the immersion method. Third, the ZnO nanorods template was removed by etching method to obtained TiO2nanotubes film. The thickness of ZnO-doped TiO2seed layer is about 200nm and the crystalline size of nanoparticles are about 5~10nm. The length of the ZnO nanorods are about 1~3μm. The TiO2nanotube was composed of TiO2nanoparticles. The short-circuit current density (Jsc), open-circuit voltage, fill factor (FF) and efficiency of TiO2nanotubes DSC were 4.63 mA·cm-2, 0.74V, 62% and 2.15%, respectively.

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