scholarly journals Substitution of Carbazole Modified Fluorenes as π-Extension in Ru(II) Complex-Influence on Performance of Dye-Sensitized Solar Cells

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Malapaka Chandrasekharam ◽  
Ganugula Rajkumar ◽  
Thogoti Suresh ◽  
Chikkam Srinivasa Rao ◽  
Paidi Yella Reddy ◽  
...  
Keyword(s):  
Dicarboxylic Acid ◽  
Extinction Coefficient ◽  
Density Functional ◽  
Fill Factor ◽  
Spectral Response ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Molar Extinction Coefficient ◽  
Tert Butyl ◽  
Film Absorption

A new high molar extinction coefficient ruthenium(II) bipyridyl complex “cis-Ru(4,-bis(9,9-dibutyl-7-(3,6-di-tert-butyl-9H-carbazol-9-yl)-9H-fluoren-2-yl)-2,-bipyridine)(2,-bipyridine-4,-dicarboxylic acid)(NCS)2, BPFC” has been synthesized and characterized by FT-IR, -NMR, and ESI-MASS spectroscopes. The sensitizer showed molar extinction coefficient of  M−1cm−1, larger as compared to the reference N719, which showed  M−1cm−1. The test cells fabricated using BPFC sensitizer employing high performance volatile electrolyte, (E01) containing 0.05 M I2, 0.1 M LiI, 0.6 M 1,2-dimethyl-3-n-propylimidazolium iodide, 0.5 M 4-tert-butylpyridine in acetonitrile solvent, exhibited solar-to-electric energy conversion efficiency (η) of 4.65% (short-circuit current density () = 11.52 mA/cm2, open-circuit voltage () = 566 mV, fill factor = 0.72) under Air Mass 1.5 sunlight, lower as compared to the reference N719 sensitized solar cell, fabricated under similar conditions, which exhibited η-value of 6.5% ( = 14.3 mA/cm2, = 640 mV, fill factor = 0.71). UV-Vis measurements conducted on TiO2 films showed decreased film absorption ratios for BPFC as compared to those of reference N719. Staining TiO2 electrodes immediately after sonication of dye solutions enhanced film absorption ratios of BPFC relative to those of N719. Time-dependent density functional theory (TD-DFT) calculations show higher oscillation strengths for 4,-bis(9,9-dibutyl-7-(3,6-di-tert-butyl-9H-carbazol-9-yl)-9H-fluoren-2-yl)-2,-bipyridine relative to 2,-bipyridine-4,-dicarboxylic acid and increased spectral response for the corresponding BPFC complex.

scholarly journals Substitution of Ethynyl-Thiophene Chromophores on Ruthenium Sensitizers: Influence on Thermal and Photovoltaic Performance of Dye-Sensitized Solar Cells

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Malapaka Chandrasekharam ◽  
Ganugula Rajkumar ◽  
Thogiti Suresh ◽  
Paidi Yella Reddy
Keyword(s):  
Extinction Coefficient ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Molar Extinction Coefficient ◽  
Visible Range ◽  
High Efficient ◽  
Conversion Efficiencies

A new high molar extinction coefficient ruthenium(II) bipyridyl complex, “Ru(2,2-bipyridine-4,4′-dicarboxylic acid)(4,4′-bis((3-hexylthiophen-2-yl)ethynyl)-2,2′-bipyridine)(NCS)2 (N(C4H9)4), MC101” was synthesized and fully characterized by 1H-NMR, ESI-MASS, FT-IR, UV-Vis., and fluorescence spectroscopes. The dye showed relatively high molar extinction coefficient of 25.0 × 103 M-1 cm-1 at λ maximum of 544 nm, while the reference C101 has shown 15.8 × 103 M-1cm-1 at λ maximum 528 nm. The monochromatic incident photon-to-collected electron conversion efficiency of 44.1% was obtained for MC101 over the entire visible range, while the C101 sensitized solar cell fabricated and evaluated under identical conditions exhibited 40.1%. The DSSCs fabricated with 0.54 cm2 active area TiO2 electrodes and high efficient electrolyte (E01), from the sensitizers MC101 and C101 exhibited energy conversion efficiencies of 3.25% (short-circuit current density (JSC) = 7.32 mA/cm2, VOC = 610 mV, ff = 0.725) and 2.94% (JSC = 6.60 mA/cm2; VOC = 630 mV; ff = 0.709), respectively, under air mass of 1.5 sunlight.

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.

scholarly journals Comparative Study of Characteristics of Dye Sensitized Solar Cells Fabricated Using Substrates Coated with Fluorine Doped Tin Oxide and Titanium

2020 ◽  
Vol 15 (3) ◽  
pp. 216-221
Author(s):  
Arbin Maharjan
Keyword(s):  
Solar Cells ◽  
Tin Oxide ◽  
Fill Factor ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Coated Glass ◽  
Cell Efficiency ◽  
Glass Substrates ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Dye-sensitized solar cells (DSSCs) have attracted many researchers because it has potential to supplement and compete with other solar cell technologies like Silicon (Si) and Cadmium Telluride (CdTe). The fabrication of DSSCs requires a photo electrode and a counter electrode of transparent and conducting nature. The commercial DSSCs uses electrodes of fluorine doped tin oxide (FTO) glass substrates. These electrodes are expensive and hence, possible alternative materials that are cheaper and that would provide better performance under similar environmental condition should be explored. In this paper, titanium (Ti)-coated glass substrates were prepared and then used to prepare electrodes for fabricating DSSCs. Similarly, DSSCs were fabricated using electrodes of conventional FTO-coated glass substrates. Performance characteristics like cell efficiency (η%), fill-factor (FF), short circuit current density (JSC) and open circuit voltage (VOC) of both fabricated DSSCs were obtained using their respective J-V characteristic curves under similar illumination of 100 mW/cm2 and with comparable transmittance under the visible transmission spectrum of 300-850 nm. The obtained results showed that DSSCs prepared using electrodes of FTO coated glass substrates have 1.557 times better cell efficiency and 2.172 times better fill factor than that of DSSCs fabricated using electrodes of Ti-coated glass substrates.

scholarly journals Improving the Spectral Response of Black Dye by Cosensitization with a Simple Indoline Based Dye in Dye-Sensitized Solar Cell

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Md. Akhtaruzzaman ◽  
Ashraful Islam ◽  
Mohammad Rezaul Karim ◽  
A. K. Mahmud Hasan ◽  
Liyuan Han
Keyword(s):  
Solar Cell ◽  
Light Absorption ◽  
Spectral Response ◽  
Short Circuit ◽  
Power Conversion ◽  
Dye Sensitized Solar Cells ◽  
Wavelength Region ◽  
Dye Sensitized Solar Cell ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Indoline dyeD-1was successfully applied as a cosensitizer for improving the spectral response of black dye in dye-sensitized solar cells (DSCs). It was observed thatD-1effectively increases the short-circuit photocurrent by offsetting the competitive light absorption byI/I3-electrolyte in the wavelength region 350–500 nm when adsorbed on the TiO2nanocrystaline films in a mix dye system. The DSCs containing theD-1and black dye achieved a power conversion efficiency of 9.80% with higher short-circuit photocurrent of 19.54 mA/cm2compared to the system of black dye without cosensitization under standard AM 1.5 sunlight.

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.

High molar extinction coefficient amphiphilic ruthenium sensitizers for efficient and stable mesoscopic dye-sensitized solar cells

2009 ◽  
Vol 2 (7) ◽  
pp. 770 ◽  
Author(s):  
Lingamallu Giribabu ◽  
Challuri Vijay Kumar ◽  
Chikkam Srinivasa Rao ◽  
Veeranagari Gopal Reddy ◽  
Paidi Yella Reddy ◽  
...  
Keyword(s):  
Solar Cells ◽  
Extinction Coefficient ◽  
Dye Sensitized Solar Cells ◽  
Molar Extinction Coefficient ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

High Molar Extinction Coefficient Heteroleptic Ruthenium Complexes for Thin Film Dye-Sensitized Solar Cells

2006 ◽  
Vol 128 (12) ◽  
pp. 4146-4154 ◽  
Author(s):  
Daibin Kuang ◽  
Seigo Ito ◽  
Bernard Wenger ◽  
Cedric Klein ◽  
Jacques-E Moser ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Extinction Coefficient ◽  
Dye Sensitized Solar Cells ◽  
Ruthenium Complexes ◽  
Molar Extinction Coefficient ◽  
Dye Sensitized ◽  
Sensitized Solar Cells
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