Low-temperature titania-graphene quantum dots paste for flexible dye-sensitised solar cell applications

D. Kishore Kumar, Damaris Suazo-Davila, Desiree García-Torres, Nathan P. Cook, Aruna Ivaturi, Min-Hung Hsu, Angel A. Martí, Carlos R. Cabrera, Baixin Chen, Nick Bennett, Hari M. Upadhyaya

Research output: Contribution to journalArticle

Abstract

Graphene possesses excellent mechanical strength and chemical inertness with high intrinsic carrier mobility and superior flexibility making them exceptional candidates for optoelectronic applications. Graphene quantum dots (GQDs) derived from graphene domains have been widely explored to study their photoluminescence properties which can be tuned by size. GQDs are biocompatible, low cytotoxic, strongly luminescent and disperse well in polar and non-polar solvents showing bright promise for the integration into devices for bioimaging, light emitting and photovoltaic applications. In the present study, graphene quantum dots were synthesized by an electrochemical cyclic voltammetry technique using reduced graphene oxide (rGO). GQDs have been incorporated into binder free TiO2 paste and studied as a photoelectrode material fabricated on ITO/PEN substrates for flexible dye sensitized solar cells (DSSCs). DSSC based on GQDs-TiO2 exhibited open circuit output potential difference (Voc) of 0.73 V, and short circuit current density (Jsc) of 11.54 mA cm-2 with an increment in power conversion efficiency by 5.48 %, when compared with those with DSSC build with just a TiO2 photoanode (open-circuit output potential difference (Voc) of 0.68 V and short circuit density (Jsc) of 10.67 mA cm-2). The results have been understood in terms of increased charge extraction and reduced recombination losses upon GQDs incorporation.
LanguageEnglish
Pages278-284
Number of pages7
JournalElectrochimica Acta
Volume305
Early online date12 Mar 2019
DOIs
Publication statusPublished - 10 May 2019

Fingerprint

Graphite
Ointments
Graphene
Semiconductor quantum dots
Titanium
Temperature
Short circuit currents
Dye-sensitized solar cells
titanium dioxide
Adhesive pastes
Networks (circuits)
Carrier mobility
Optoelectronic devices
Oxides
Conversion efficiency
Cyclic voltammetry
Strength of materials
Binders
Photoluminescence
Current density

Keywords

  • graphene quantum dots
  • binder free TiO2 paste
  • polymer substrate
  • DSSC

Cite this

Kumar, D. K., Suazo-Davila, D., García-Torres, D., Cook, N. P., Ivaturi, A., Hsu, M-H., ... Upadhyaya, H. M. (2019). Low-temperature titania-graphene quantum dots paste for flexible dye-sensitised solar cell applications. Electrochimica Acta, 305, 278-284. https://doi.org/10.1016/j.electacta.2019.03.040
Kumar, D. Kishore ; Suazo-Davila, Damaris ; García-Torres, Desiree ; Cook, Nathan P. ; Ivaturi, Aruna ; Hsu, Min-Hung ; Martí, Angel A. ; Cabrera, Carlos R. ; Chen, Baixin ; Bennett, Nick ; Upadhyaya, Hari M. / Low-temperature titania-graphene quantum dots paste for flexible dye-sensitised solar cell applications. In: Electrochimica Acta. 2019 ; Vol. 305. pp. 278-284.
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Kumar, DK, Suazo-Davila, D, García-Torres, D, Cook, NP, Ivaturi, A, Hsu, M-H, Martí, AA, Cabrera, CR, Chen, B, Bennett, N & Upadhyaya, HM 2019, 'Low-temperature titania-graphene quantum dots paste for flexible dye-sensitised solar cell applications' Electrochimica Acta, vol. 305, pp. 278-284. https://doi.org/10.1016/j.electacta.2019.03.040

Low-temperature titania-graphene quantum dots paste for flexible dye-sensitised solar cell applications. / Kumar, D. Kishore; Suazo-Davila, Damaris ; García-Torres, Desiree ; Cook, Nathan P.; Ivaturi, Aruna; Hsu, Min-Hung; Martí, Angel A.; Cabrera, Carlos R.; Chen, Baixin ; Bennett, Nick ; Upadhyaya, Hari M.

In: Electrochimica Acta, Vol. 305, 10.05.2019, p. 278-284.

Research output: Contribution to journalArticle

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T1 - Low-temperature titania-graphene quantum dots paste for flexible dye-sensitised solar cell applications

AU - Kumar, D. Kishore

AU - Suazo-Davila, Damaris

AU - García-Torres, Desiree

AU - Cook, Nathan P.

AU - Ivaturi, Aruna

AU - Hsu, Min-Hung

AU - Martí, Angel A.

AU - Cabrera, Carlos R.

AU - Chen, Baixin

AU - Bennett, Nick

AU - Upadhyaya, Hari M.

PY - 2019/5/10

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N2 - Graphene possesses excellent mechanical strength and chemical inertness with high intrinsic carrier mobility and superior flexibility making them exceptional candidates for optoelectronic applications. Graphene quantum dots (GQDs) derived from graphene domains have been widely explored to study their photoluminescence properties which can be tuned by size. GQDs are biocompatible, low cytotoxic, strongly luminescent and disperse well in polar and non-polar solvents showing bright promise for the integration into devices for bioimaging, light emitting and photovoltaic applications. In the present study, graphene quantum dots were synthesized by an electrochemical cyclic voltammetry technique using reduced graphene oxide (rGO). GQDs have been incorporated into binder free TiO2 paste and studied as a photoelectrode material fabricated on ITO/PEN substrates for flexible dye sensitized solar cells (DSSCs). DSSC based on GQDs-TiO2 exhibited open circuit output potential difference (Voc) of 0.73 V, and short circuit current density (Jsc) of 11.54 mA cm-2 with an increment in power conversion efficiency by 5.48 %, when compared with those with DSSC build with just a TiO2 photoanode (open-circuit output potential difference (Voc) of 0.68 V and short circuit density (Jsc) of 10.67 mA cm-2). The results have been understood in terms of increased charge extraction and reduced recombination losses upon GQDs incorporation.

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KW - binder free TiO2 paste

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