Determination of Rate Constants for Charge Transfer and the Distribution of Semiconductor and Electrolyte Electronic Energy Levels in Dye-Sensitized Solar Cells by Open-Circuit Photovoltage Decay Method

The four thiocyanate free ruthenium(II) complexes; [Ru(N^N)2(C^N)]PF6were synthesized and characterized for dye sensitized solar cells (DSSCs). The results showed that the broad absorptions covered the visible region from metal to ligand charge transfer (MLCT) were obtained with the main peaks at 560, 490 and 400 nm. The materials were studied DSSC performance under standard AM 1.5. Compound PP1 showed the power conversion efﬁciency (PCE) at 3.10%, with a short-circuit photocurrent density (Jsc) of 7.99 mA cm-2, an open-circuit photovoltage (Voc) of 563 mV and a high ﬁll factor (ff) of 0.690.

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Performance Degradation of Dye-Sensitized Solar Cells Induced by Electrolytes

Advances in Materials Science and Engineering ◽

10.1155/2012/902146 ◽

2012 ◽

Vol 2012 ◽

pp. 1-4 ◽

Cited By ~ 6

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.

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Preparation of Nano-Ag-TiO2 Composites by Co-60 Gamma Irradiation to Enhance the Photocurrent of Dye-Sensitized Solar Cells

International Journal of Photoenergy ◽

10.1155/2019/5737952 ◽

2019 ◽

Vol 2019 ◽

pp. 1-8

Author(s):

Le Thanh Nguyen Huynh ◽

Viet Hai Le ◽

Thanh Long Vo ◽

Thi Kim Lan Nguyen ◽

Quoc Hien Nguyen ◽

...

Keyword(s):

Solar Cells ◽

Charge Transfer ◽

Electrochemical Impedance ◽

Dye Sensitized Solar Cells ◽

Energy Conversion Efficiency ◽

Charge Transfer Resistance ◽

Open Circuit ◽

Transfer Resistance ◽

Dye Sensitized ◽

Sensitized Solar Cells

Nano-silver-titanium dioxide (Ag-TiO2) composites were prepared from commercial TiO2 (P25, Degussa) and silver nitrate (AgNO3) by gamma Co-60 irradiation method with various initial concentrations of AgNO3. The nano-AgTiO2 composites are utilized as the photoanode for dye-sensitized solar cells (DSCs). Under full sunlight illumination (1000 W/m2, AM 1.5), the efficiency of DSCs has improved significantly despite the Ag content of below 1%. The DSC—assembled with 0.75 Ag-TiO2 (0.75% Ag) photoanode—showed that the photocurrent was significantly enhanced from 8.1 mA.cm−2 to 9.5 mA.cm−2 compared to the DSCs using bared TiO2 photoanode. The unchanged open-circuit voltage resulted in the overall energy conversion efficiency to be increased by 25% from 3.75% to 4.86%. Electrochemical impedance spectroscopy (EIS) analysis showed that the charge transfer resistance is reduced when increasing Ag content, demonstrating that the charge transfer at TiO2/dye interface was enhanced in the presence of silver nanoparticles.

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Optical determination of charge transfer times from indoline dyes to ZnO in solid state dye-sensitized solar cells

AIP Advances ◽

10.1063/1.5025777 ◽

2018 ◽

Vol 8 (5) ◽

pp. 055218 ◽

Cited By ~ 1

Author(s):

I. Meyenburg ◽

N. Hofeditz ◽

R. Ruess ◽

M. Rudolph ◽

D. Schlettwein ◽

...

Keyword(s):

Solar Cells ◽

Charge Transfer ◽

Solid State ◽

Dye Sensitized Solar Cells ◽

Dye Sensitized ◽

Optical Determination ◽

Sensitized Solar Cells ◽

Transfer Times

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A molecular photosensitizer achieves a Voc of 1.24 V enabling highly efficient and stable dye-sensitized solar cells with copper(II/I)-based electrolyte

Nature Communications ◽

10.1038/s41467-021-21945-3 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Dan Zhang ◽

Marko Stojanovic ◽

Yameng Ren ◽

Yiming Cao ◽

Felix T. Eickemeyer ◽

...

Keyword(s):

Solar Cells ◽

Solar Cell ◽

Spectral Response ◽

Dye Sensitized Solar Cells ◽

Open Circuit ◽

Ambient Light ◽

Dye Sensitized ◽

Highly Efficient ◽

Sensitized Solar Cells ◽

Open Circuit Photovoltage

AbstractTo develop photosensitizers with high open-circuit photovoltage (Voc) is a crucial strategy to enhance the power conversion efficiency (PCE) of co-sensitized solar cells. Here, we show a judiciously tailored organic photosensitizer, coded MS5, featuring the bulky donor N-(2’,4’-bis(dodecyloxy)-[1,1’-biphenyl]-4-yl)-2’,4’-bis(dodecyloxy)-N-phenyl-[1,1’-biphenyl]-4-amine and the electron acceptor 4-(benzo[c][1,2,5]thiadiazol-4-yl)benzoic acid. Employing MS5 with a copper (II/I) electrolyte enables a dye-sensitized solar cell (DSC) to achieve a strikingly high Voc of 1.24 V, with the Voc deficit as low as 130 mV and an ideality factor of merely 1.08. The co-sensitization of MS5 with the wider spectral-response dye XY1b produces a highly efficient and stable DSC with the PCE of 13.5% under standard AM1.5 G, 100 mW cm−2 solar radiation. Remarkably, the co-sensitized solar cell (active area of 2.8 cm2) presents a record PCE of 34.5% under ambient light, rendering it very attractive as an ambient light harvesting energy source for low power electronics.

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