Improving the efficiency of dye sensitized solar cells by TiO2-graphene nanocomposite photoanode

Mehmood, Umer; Ahmed, Shakeel; Hussein, Ibnelwaleed A.; Harrabi, K.

doi:10.1016/j.photonics.2015.08.003

Cited by 26 publications

(7 citation statements)

References 36 publications

(40 reference statements)

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“…Moreover, the R 2 denotes the recombination resistance to the free carriers at anode/electrolyte interface . The higher the free carrier recombination resistance, the larger will be the electron lifetime and vice versa . The charge recombination resistances are listed in Table .…”

Section: Resultsmentioning

confidence: 99%

“…1,24 The higher the free carrier recombination resistance, the larger will be the electron lifetime and vice versa. 41 The charge recombination resistances are listed in Table 3. It can be observed from Table 3 and Figure 6 that the R 2 of 0.3 mM Z907 + 0.2 mM SQ2-sensitized DSSC possesses the higher resistance to the recombination of free charges and hence longer electron transport lifetime which is verified from the increase in the efficiency.…”

Section: Eis Analysis Of Fabricated Dsscmentioning

confidence: 99%

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Performance enhancement of dye-sensitized solar cells via cosensitization of ruthenizer Z907 and organic sensitizer SQ2

et al. 2018

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Summary Cosensitization is a highly effective technique to enhance the photovoltaic performance of a dye‐sensitized solar cell. The main objective of this work is to improve the performance of dye‐sensitized solar cell using cosensitization approach and investigation of the effect of the organic cosensitizer concentration on the power conversion efficiency of the fabricated solar cell devices. In this work, Z907, a ruthenium dye, has been cosensitized with SQ2, an organic sensitizer, and an overall efficiency of 7.83% has been achieved. The fabricated solar cells were evaluated using UV‐Vis spectroscopy, current‐voltage (I‐V) characteristics, and electrochemical impedance spectroscopy analysis. Our results clearly indicate that the concentration of organic cosensitizer strongly affects the photovoltaic performance of fabricated solar cells. Upon optimization, the cell fabricated with 0.3 mM Z907 + 0.2 mM SQ2 dye solution demonstrated Jsc (mA/cm2) = 21.38, Voc (mV) = 698.37, FF (%) = 52.46, and power conversion efficiency of η (%) = 7.83 under standard AM1.5G 1 sun illumination (100 mW/cm2). It was observed that the efficiency of cosensitized solar cells is significantly superior than that of individual sensitized solar cells (Z907 [η = 5.08%] and SQ2 [η = 1.39%]). This enhancement in efficiency could be attributed to the lower electron‐hole recombination rate, decrease in competitive absorption of I−/I−3, and less dye aggregation because of the synergistic effect in cosensitized solar cells.

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Section: Resultsmentioning

confidence: 99%

Section: Eis Analysis Of Fabricated Dsscmentioning

confidence: 99%

Performance enhancement of dye-sensitized solar cells via cosensitization of ruthenizer Z907 and organic sensitizer SQ2

et al. 2018

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“…to the near IR region of the electromagnetic radiation. Thus, this generation of solar cells could potentially provide an economically viable source of clean energy …”

Section: Introductionmentioning

confidence: 99%

“…An increase in semiconductor film thickness allows for higher quantity of dye loadings; however, it will result in an increased diffusion path length for photo‐generated electrons. Besides, thicker films more likely will contain structural defects; therefore, it will cause more electron trapping . A modern approach to improve thin film solar cell systems includes incorporation of plasmonic metal nanoparticles such as gold or silver.…”

Section: Introductionmentioning

confidence: 99%

Enhancement in Dye‐Sensitized Solar Cells Using Surface Plasmon Resonance Effects from Colloidal Core‐Shell Au@SiO2 Nanoparticles

Neshat

Safdari

2019

ChemistrySelect

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Surface plasmon resonance effect from silica coated colloidal gold nanoparticles (Au@SiO 2 NPs) was investigated on photocurrent density in dye sensitized solar cells (DSSCs). The less stability and aggregation of noble metal nanoparticles have limited their application in dye-based solar cells. In this report, a simple method for the incorporation of noble Au nanoparticle in DSSCs to achieve higher photocurrent density is described.The DSSCs showed better performance when photo-anode surface of a DSSC was decorated with Au@SiO 2 NPs of appropriate size and shape. With incorporated Au@SiO 2 NPs to the anode surface, 1 cm 2 and 2 cm 2 DSSCs exhibited 20% and 10% increase in the solar energy-to-electricity conversion efficiencies under AM 1.5 illumination and 100 mW cm À 2 irradiations.

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“…The dye, which is the major component of the DSSC, absorbs sunlight and produces excitons [6,7]. It is chemically bonded to the porous surface of a semiconductor.…”

Section: Introductionmentioning

confidence: 99%

New 1,3,4-Oxadiazole Based Photosensitizers for Dye Sensitized Solar Cells (DSSCs)

Mehmood

Hussein

Daud

2015

International Journal of Photoenergy

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1,3,4-Oxadiazole based photosensitizers with biphenyl, naphthalene, anthracene, and triphenylamine as the electron-donating moiety were synthesized for solar cell applications. In these photosensitizers, cyano groups were introduced as the electron acceptor and the anchor group because of their high electron-withdrawing ability and strong bonding to the semiconductor. Oxadiazole isomers were used as theπ-conjugation system, which bridges the donor-acceptor systems. The electrochemical and optical properties of the sensitizers were investigated both in their native form and upon incorporation into dye sensitized solar cells. The results of UV-visible absorption spectroscopy, electrochemical impedance spectroscopic measurements, and photocurrent voltage characteristics indicate that 1,3,4-oxadiazole pi-spacer with the anthracene moiety has the highest efficiency of 2.58%. Density functional theory was employed to optimize the structures of the sensitizers and the TiO2cluster.

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Improving the efficiency of dye sensitized solar cells by TiO2-graphene nanocomposite photoanode

Cited by 26 publications

References 36 publications

Performance enhancement of dye-sensitized solar cells via cosensitization of ruthenizer Z907 and organic sensitizer SQ2

Performance enhancement of dye-sensitized solar cells via cosensitization of ruthenizer Z907 and organic sensitizer SQ2

Enhancement in Dye‐Sensitized Solar Cells Using Surface Plasmon Resonance Effects from Colloidal Core‐Shell Au@SiO2 Nanoparticles

New 1,3,4-Oxadiazole Based Photosensitizers for Dye Sensitized Solar Cells (DSSCs)

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