Molten Salt Synthesized TiO<sub>2</sub>-Graphene Composites for Dye Sensitized Solar Cells Applications

Madhavan, Asha Anish; Ranjusha, R.; Daya, K.C.; Arun, T.; Praveen, P.; Sanosh, K.P.; Subramanian, K. R. V.; Nair, Shantikumar V.; Nair, A. Sreekumaran; Balakrishnan, A.

doi:10.1166/sam.2014.1790

Cited by 10 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…22). 95 Compared to the zero-dimensional nanostructures, onedimensional nanostructures provide a direct pathway for the electrons to travel thereby reducing the loss of electrons by recombination. 96 The one-dimensional nanostructures also act as light scattering centres, scattering light in the red part of the spectrum thereby increasing the light absorption by the dye molecules 97 and thus enhance the light harvesting efficiency.…”

Section: Carbon Nanostructures/tio 2 Composites For Dsscsmentioning

confidence: 99%

An in-depth review on the role of carbon nanostructures in dye-sensitized solar cells

et al. 2015

Self Cite

View full text Add to dashboard Cite

Dye-sensitized solar cells (DSSCs) are considered to be a promising, low-cost alternatives for the amorphous silicon solar cells. The major components of a DSC include a metal oxide (usually TiO2), dye, electrolyte and a Pt-or carbon-deposited counter electrode. The photoexcited electrons from the dyes diffuse through the TiO2 network and reach the counter electrode through an external circuit. However due to the trap-limited diffusion process, the electron collection efficiency is affected. Thus, for a hassale-free transport of electrons there is a need for additional electron transport channels. Further in order to reduce the overall cost of the device there is also a need for cheaper alternative counter electrodes in place of Pt. The 15 th most abundant element in the earth's crust carbon and its allotropes with their outstanding catalytic activity and electrical conductivity proves to be a promising material to overcome all these shortcomings and demerits. Fig. 45.A) Schematic showing the interwined carbon nanotube fiber based fiber shaped DSSC and B) SEM image of the twined structure 181 .

show abstract

Section: Carbon Nanostructures/tio 2 Composites For Dsscsmentioning

confidence: 99%

An in-depth review on the role of carbon nanostructures in dye-sensitized solar cells

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…The graphene in N-TNTs can also act as bridging layer which helps in effective separation and transport of photo generated electrons from CB of TiO 2 , thereby efficiently separating the electrons and preventing charge carrier recombination through "hoppingbridging mechanism". 35 The increased recombination resistance in plasmonic devices is attributed to the suppression of electron recombination by insulating thin SiO 2 shell. So, shell can hinder the carrier trapping and recombination apart from preventing corrosion of Au NPs with redox electrolyte (I À /I 3…”

Section: Resultsmentioning

confidence: 99%

Effect of graphene and Au@SiO₂ core–shell nano-composite on photoelectrochemical performance of dye-sensitized solar cells based on N-doped titania nanotubes

Chandrasekhar

Komarala

2015

RSC Adv.

View full text Add to dashboard Cite

We have investigated the role of graphene and Au@SiO 2 core-shell nano-composite (NC), on the performance of dye-sensitized solar cells (DSSC) based on nitrogen doped TiO 2 nanotubes (N-TNTs) as photoanodes. The N-TNTs were synthesized by an environmentally-friendly solvothermal method. The photoelectrochemical performance of DSSCs with N-TNTs improved compared to undoped TNTs; due to extended absorption in the visible part of the solar spectrum. An improved open circuit voltage was also observed with N-TNTs due to a change in the TiO 2 Fermi energy level with increased electron density. After that, we investigated DSSC performance using graphene in N-TNTs with varying concentration from 0.2 to 1.0 wt%. With an optimal concentration of graphene (0.6 wt%), we have achieved 6.33% energy conversion efficiency, which is $47.5% enhancement in performance compared to pure N-TNTs. The enhanced device performance with graphene is mainly due to better dye loading, improved electron transport and charge collection process. To further boost the conversion efficiency of the DSSC based on graphene/N-TNTs NC, we introduced Au@SiO 2 core-shell nanoparticles (NPs) of different concentration into the device structure. Finally, we are able to fabricate a DSSC having an energy conversion efficiency of 7.01% with 1.8% (w/w) of Au@SiO 2 NPs, due to an improved excitation of dye molecules by generated strong near-fields around the Au NPs along with incident light far-fields.Scheme 1 Schematic diagramme of DSSC fabricated using N-TNTs mixed with graphene and Au@SiO 2 core-shell NPs.84424 | RSC Adv., 2015, 5, 84423-84431This journal is

show abstract

“…Figure 8 shows typical density-voltage (J -V ) curves acquired from DSSCs fabricated with different TGR nanocomposites (0-1 wt%), photoanode films with active area of 0.25 cm 2 using solar simulator with AM 1.5G (100 mW cm −2 ). [40]. Further work is going on for the optimization of DSSC parameters for the fabrication of this device with enhanced efficiency.…”

Section: 4a Uv-visible Absorption Spectramentioning

confidence: 99%

Process optimization of dye-sensitized solar cells using $$\hbox {TiO}_{2}$$ TiO 2 –graphene nanocomposites

2017

View full text Add to dashboard Cite

TiO 2-graphene (TGR) nanocomposites with varying concentrations of graphene from 0 to 1 wt% were prepared by direct mix method. X-ray diffraction (XRD) spectra confirmed the incorporation of graphene in photoanode material, which was further supported by field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX). The UV-visible spectrum of these nanocomposites shifted towards higher wavelength region as compared to pure TiO 2 that indicated a reduced band gap and hence, enhanced absorption bandwidth. Significant reduction in electron-hole recombination was confirmed from photoluminescence spectroscopy. These TGR nanocomposite films after tethering with black dye were employed as photoanodes in dye-sensitized solar cells (DSSCs). The efficiency of solar cells at varying concentrations of graphene (in photoandes) was also investigated. TGR 0.25 wt% nanocomposite showed the highest photocurrent density (J SC) of 18.4 mA cm −2 and efficiency (η) of 4.69%.

show abstract

Molten Salt Synthesized TiO₂-Graphene Composites for Dye Sensitized Solar Cells Applications

Cited by 10 publications

References 0 publications

An in-depth review on the role of carbon nanostructures in dye-sensitized solar cells

An in-depth review on the role of carbon nanostructures in dye-sensitized solar cells

Effect of graphene and Au@SiO₂ core–shell nano-composite on photoelectrochemical performance of dye-sensitized solar cells based on N-doped titania nanotubes

Process optimization of dye-sensitized solar cells using $$\hbox {TiO}_{2}$$ TiO 2 –graphene nanocomposites

Contact Info

Product

Resources

About

Molten Salt Synthesized TiO2-Graphene Composites for Dye Sensitized Solar Cells Applications

Cited by 10 publications

References 0 publications

An in-depth review on the role of carbon nanostructures in dye-sensitized solar cells

An in-depth review on the role of carbon nanostructures in dye-sensitized solar cells

Effect of graphene and Au@SiO2 core–shell nano-composite on photoelectrochemical performance of dye-sensitized solar cells based on N-doped titania nanotubes

Process optimization of dye-sensitized solar cells using $$\hbox {TiO}_{2}$$ TiO 2 –graphene nanocomposites

Contact Info

Product

Resources

About

Molten Salt Synthesized TiO₂-Graphene Composites for Dye Sensitized Solar Cells Applications

Effect of graphene and Au@SiO₂ core–shell nano-composite on photoelectrochemical performance of dye-sensitized solar cells based on N-doped titania nanotubes