scholarly journals Study on Carbon Nanocomposite Counterelectrode for Dye-Sensitized Solar Cells

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Yiming Chen ◽  
Haiyan Zhang ◽  
Yuting Chen ◽  
Jiapeng Lin
Keyword(s):  
Solar Cells ◽  
Electrochemical Impedance ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Composite Electrodes ◽  
Dye Sensitized ◽  
Sensitized Solar Cells ◽  
Carbon Nanocomposite ◽  
Nanocomposite Electrodes

Carbon nanocomposite electrodes were prepared by adding carbon nanotubes (CNTs) into carbon black as counterelectrodes of dye-sensitized solar cells(DSSCs). The morphology and structure of carbon nanocomposite electrodes were studied by scanning electron microscopy. The influence of CNTs on the electrochemical performance of carbon nanocomposite electrodes is investigated by cyclic voltammetry and electrochemical impedance spectroscopy. Carbon nano composite electrodes with CNTs exhibit a highly interconnected network structure with high electrical conductivity and good catalytic activity. The influence of different CNTs content in carbon nanocomposite electrodes on the open-circuit voltage, short-circuit current, and filling factor of DSSCs is also investigated. DSSCs with 10% CNTs content exhibit the best photovoltaic performance in our experiments.

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 Photovoltaic Performance of Dye-Sensitized Solar Cells Containing ZnO Microrods

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1645 ◽  
Author(s):  
Seong Il Cho ◽  
Hye Kyeong Sung ◽  
Sang-Ju Lee ◽  
Wook Hyun Kim ◽  
Dae-Hwan Kim ◽  
...  
Keyword(s):  
Solar Cells ◽  
Surface Area ◽  
Electrochemical Impedance ◽  
Collection Efficiency ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Charge Recombination ◽  
Growth Time ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

At an elevated temperature of 90 °C, a chemical bath deposition using an aqueous solution of Zn(NO3)2·6H2O and (CH2)6N4 resulted in the formation of both nanoflowers and microrods of ZnO on F-doped SnO2 glass with a seed layer. The nanoflowers and microrods were sensitized with dyes for application to the photoelectrodes of dye-sensitized solar cells (DSSCs). By extending the growth time of ZnO, the formation of nanoflowers was reduced and the formation of microrods favored. As the growth time was increased from 4 to 6 and then to 8 h, the open circuit voltage (Voc) values of the DSSCs were increased, whilst the short circuit current (Jsc) values varied only slightly. Changes in the dye-loading amount, dark current, and electrochemical impedance were monitored and they revealed that the increase in Voc was found to be due to a retardation of the charge recombination between photoinjected electrons and I3− ions and resulted from a reduction in the surface area of ZnO microrods. A reduced surface area decreased the dye contents adsorbed on the ZnO microrods, and thereby decreased the light harvesting efficiency (LHE). An increase in the electron collection efficiency attributed to the suppressed charge recombination counteracted the decreased LHE, resulting in comparable Jsc values regardless of the growth time.

scholarly journals There Is a Future for N-Heterocyclic Carbene Iron(II) Dyes in Dye-Sensitized Solar Cells: Improving Performance through Changes in the Electrolyte

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4181 ◽  
Author(s):  
Mariia Karpacheva ◽  
Vanessa Wyss ◽  
Catherine E. Housecroft ◽  
Edwin C. Constable
Keyword(s):  
Solar Cells ◽  
Alkyl Chain ◽  
Electrochemical Impedance ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Ion Concentration ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

By systematic tuning of the components of the electrolyte, the performances of dye-sensitized solar cells (DSCs) with an N-heterocyclic carbene iron(II) dye have been significantly improved. The beneficial effects of an increased Li+ ion concentration in the electrolyte lead to photoconversion efficiencies (PCEs) up to 0.66% for fully masked cells (representing 11.8% relative to 100% set for N719) and an external quantum efficiency maximum (EQEmax) up to approximately 25% due to an increased short-circuit current density (JSC). A study of the effects of varying the length of the alkyl chain in 1-alkyl-3-methylimidazolium iodide ionic liquids (ILs) shows that a longer chain results in an increase in JSC with an overall efficiency up to 0.61% (10.9% relative to N719 set at 100%) on going from n-methyl to n-butyl chain, although an n-hexyl chain leads to no further gain in PCE. The results of electrochemical impedance spectroscopy (EIS) support the trends in JSC and open-circuit voltage (VOC) parameters. A change in the counterion from I− to [BF4]− for 1-propyl-3-methylimidazolium iodide ionic liquid leads to DSCs with a remarkably high JSC value for an N-heterocyclic carbene iron(II) dye of 4.90 mA cm−2, but a low VOC of 244 mV. Our investigations have shown that an increased concentration of Li+ in combination with an optimized alkyl chain length in the 1-alkyl-3-methylimidazolium iodide IL in the electrolyte leads to iron(II)-sensitized DSC performances comparable with those of containing some copper(I)-based dyes.

Novel Ball-Type Dioxy-O-carborane Bridged Cobaltphthalocyanine: Synthesis, DFT Studies and Characterization for Dye-Sensitized Solar Cells as Photosensitizers

2018 ◽  
Author(s):  
Sevil ŞENER
Keyword(s):  
Solar Cells ◽  
Density Functional ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Performance Parameters ◽  
Visible Absorption ◽  
Dye Sensitized ◽  
Sensitization Time ◽  
Sensitized Solar Cells

The synthesis and spectroscopic characterization of an innovative ball-type cobalt (II)  metallophthalocyanine 4, bridged by four 1,2-bis(2-hydroxymethyl)-O-carborane (HMOC) 1 units has been achieved. The structure of 4 was characterized via elemental analysis, UV–visible absorption spectroscopy, FT-IR spectroscopy, and MALDI-TOF mass spectrometry. The photovoltaic performance of the newly synthesized compound in dye-sensitized solar cells was investigated. In order to clarify the effect of dye-sensitization time on photovoltaic performance parameters, the sensitization time was varied from 12 to 60 h and the performance parameters were investigated. It was found that sensitization time had a strong effect on the main performance parameters. The best photovoltaic performance was achieved after sensitization for 36 h (short circuit current density, 6.41 mA cm−2; overall conversion efficiency, 3.42%). Geometry optimization of the molecule was performed using density functional theory and shows a peripheral structure.

Hybrid Structure of TiO2 Nanofiber and Nanoparticle for Dye-Sensitized Solar Cells

2014 ◽  
Vol 922 ◽  
pp. 356-359
Author(s):  
Ji Sun Kim ◽  
Seong Cheol Shim ◽  
Tae Hwan Hwang ◽  
Won Youl Choi
Keyword(s):  
Solar Cells ◽  
Electrochemical Impedance ◽  
Short Circuit ◽  
Anatase Phase ◽  
Dye Sensitized Solar Cells ◽  
Hybrid Structure ◽  
Dye Sensitized ◽  
Nanofiber Film ◽  
Sensitized Solar Cells ◽  
Screen Printed

Hybrid structure of TiO2nanofiber and nanoparticle as a photoelectrode was very attractive in dye-sensitized solar cells (DSCs) because TiO2nanoparticle provided a high specific surface area to adsorb the N719 dye and TiO2nanofiber was a direct path to transfer photoelectron from dye to electrode. TiO2nanofiber film was prepared with titanium-tetraisopropoxide (TTIP) and polyvinylpyrrolidone (PVP) based precursor by electro-spinning process. To fabricate the hybrid structure, TiO2nanoparticular paste was screen printed on the TiO2nanofiber film. Electrospun TiO2nanofiber film and screen printed TiO2nanoparticular film were combined in layer by layer method. These films were observed as an anatase phase by X-ray diffraction pattern. Thickness and diameter of TiO2nanofibers were ~5μm and ~400nm, respectively. Thickness and particle size of TiO2particles were ~5μm and ~20nm, respectively. Compared to conventional DSCs, higher short circuit current densities (Jsc) of 6.47 mA/cm2and higher power conversion efficiency of 3.06 % were measured in DSCs having hybrid structure of TiO2nanofiber and nanoparticle. Electrochemical impedance spectroscopy (EIS) was observed to understand an electron transfer and life time.

Fabrication of Core-Shell Structured TiO2/MgO Electrodes for Dye-Sensitized Solar Cells

2015 ◽  
Vol 787 ◽  
pp. 3-7 ◽  
Author(s):  
S. Karuppuchamy ◽  
C. Brundha
Keyword(s):  
Solar Cells ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Core Shell ◽  
Dye Sensitized ◽  
The Core ◽  
Sensitized Solar Cells

We demonstrated the construction and performance of dye-sensitized solar cells (DSCs) based on nanoparticles of TiO2coated with thin shells of MgO by simple solution growth technique. The XRD patterns confirm the presence of both TiO2and MgO in the core-shell structure. The effect of varied shell thickness on the photovoltaic performance of the core-shell structured electrode is also investigated. We found that MgO shells of all thicknesses perform as barriers that improve open-circuit voltage (Voc) of the DSCs only at the expense of a larger decrease in short-circuit current density (Jsc). The energy conversion efficiency was greatly dependent on the thickness of MgO on TiO2film, and the highest efficiency of 4.1% was achieved at the optimum MgO shell layer.

scholarly journals Fabrication of TiO2/CdS heterostructure photoanodes and optimization of light scattering to improve the photovoltaic performance of dye sensitized solar cells (DSSCs)

2021 ◽  
Author(s):  
S. Revathi ◽  
A Pricilla Jeyakumari
Keyword(s):  
Solar Cells ◽  
Conversion Efficiency ◽  
Electrochemical Impedance ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Photocurrent Density ◽  
Cds Nanoparticles ◽  
Molar Ratios ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Abstract Currently, the TiO2/CdS photoanodes based dye sensitized solar cells (DSSCs) have shown extraordinary developments in the photo conversion efficiency. In this report, pristine TiO2, CdS and various molar ratios of TiO2/CdS photoanodes were prepared by one step microwave irradiation route and followed by doctor blade method. The sheet like morphology of the TiO2 and CdS nanoparticles were clearly evident from the SEM and TEM images. A significant reduction band gap with enhanced light absorption and rapid prevention of electron hole pair was explored by UV-DRS and PL studies. The photocurrent density-voltage (J-V) and electrochemical impedance (EIS) characteristics were analyzed for assembled solar cell. The photo-conversion efficiency of 12.8% was obtained with the configuration TiO2/CdS (200 mg) that represent a 2.5 fold increment compared to bare TiO2 (5.33%) as well as commercial Pt (6.11%). The experimental results are discussed.

scholarly journals Piperidine-Substituted Perylene Sensitizer for Dye-Sensitized Solar Cells

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Joe Otsuki ◽  
Yusho Takaguchi ◽  
Daichi Takahashi ◽  
Palanisamy Kalimuthu ◽  
Surya Prakash Singh ◽  
...  
Keyword(s):  
Solar Cells ◽  
Conversion Efficiency ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Photocurrent Density ◽  
Open Circuit ◽  
Visible Range ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

We have prepared a novel piperidine-donor-substituted perylene sensitizer, PK0002, and studied the photovoltaic performance in dye-sensitized solar cells (DSSCs). Physical properties and photovoltaic performance of this new perylene derivative PK0002 are reported and compared with those of unsubstituted perylene sensitizer, PK0003. PK0002, when anchored to nanocrystalline TiO2 films, achieves very efficient sensitization across the whole visible range extending up to 800 nm. The incident photon-to-current conversion efficiency (IPCE) spectrum was consistent with the absorption spectrum and resulted in a high short-circuit photocurrent density (Jsc) of 8.8 mA cm-2. PK0002 showed higher IPCE values than PK0003 in the 520–800 nm region. Under standard AM 1.5 irradiation (100 mW cm-2) and using an electrolyte consisting of 0.6 M dimethylpropyl-imidazolium iodide, 0.05 M I2, 0.1 M LiI, and 0.5 M tert-butylpyridine in acetonitrile, a solar cell containing sensitizer PK0002 yielded a short-circuit photocurrent density of 7.7 mA cm-2, an open-circuit photovoltage of 0.57 V, and a fill factor of 0.70, corresponding to an overall conversion efficiency of 3.1%.

scholarly journals Ball-Type Dioxy-o-Carborane Bridged Cobaltphthalocyanine: Synthesis, Characterization and DFT Studies For Dye-Sensitized Solar Cells as Photosensitizer

2020 ◽  
Vol 26 (1) ◽  
pp. 37-45
Author(s):  
Sevil Şener
Keyword(s):  
Solar Cells ◽  
Density Functional ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Performance Parameters ◽  
Dye Sensitized ◽  
Sensitization Time ◽  
Sensitized Solar Cells

AbstractThe synthesis and spectroscopic characterization of an innovative ball-type cobalt metallophthalocyanine 4, bridged by four 1,2-bis(2-hydroxymethyl)-O-carborane (HMOC) 1 units, has been achieved. The synthesized compound 4 was characterized structurally and electronically using elemental analysis, UV-Vis absorption spectroscopy, FT-IR spectroscopy, MALDI-TOF mass spectrometry, EPR spectroscopy and magnetic susceptibility. The photovoltaic performance of the newly synthesized compound in dye-sensitized solar cells was investigated. In order to clarify the effect of dye-sensitization time on photovoltaic performance parameters, the sensitization time was varied from 12 to 60 h and the performance parameters were investigated. It was found that sensitization time had a strong effect on the main performance parameters. The best photovoltaic performance was achieved after sensitization for 36 h (short circuit current density, 5.41 mA cm−2; overall conversion efficiency, 3.42%). Computational UV-Vis absorption spectra of the molecule was calculated using time dependent density functional theory and was found consistent with measured UV-Vis spectra.

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