Photoinduced optical transparency in dye-sensitized solar cells containing graphene nanoribbons

Josef Aaron Velten, Javier Carretero-González, Elizabeth Castillo-Martínez, Julia Bykova, Alex Cook, Ray Baughman, Anvar Zakhidov

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We describe the use of few-layer graphene nanoribbons, either attached to counter electrodes or dispersed into electrolyte, to induce optical transparency of an iodide/triiodide redox couple in a dye-sensitized solar cell (DSSC). We then evaluate the effect of reversible bleaching of the electrolyte on the DSSC performance. This bleaching effect is related to an energy transfer from - photoexcited quantum-dot-like regions to the triiodide (I 3 -) radical ions in the electrolyte, saturating their absorption in the visible optical range. DSSC power conversion efficiency using few-layer graphene nanoribbons at the counter electrode (5.8%) did not deteriorate when the electrolyte became optically transparent. The increased transparency of the electrolyte resulted in a decreased photocurrent density (from 17.6 to 14.2 mA/cm ), an unchanged open circuit voltage of 750 mV, and a slightly increased fill factor (from 0.45 to 0.55). When the few-layer graphene nanoribbons were introduced into the electrolyte directly by ultrasonication, a semitransparent DSSC was found to have increased its power conversion efficiency in an optically inverted setup from 5.75% to 7.01%, arising from an increase in photocurrent from 9.9 to 12.1 mA/cm 2. This significant photocurrent increase demonstrates that the effect of electrolyte bleaching can be used for further improving power conversion efficiency for inverted and tandem DSSCs, in which light has to pass through the electrolyte to generate photocurrent on one or more photocells.

Original languageEnglish (US)
Pages (from-to)25125-25131
Number of pages7
JournalJournal of Physical Chemistry C
Volume115
Issue number50
DOIs
StatePublished - Dec 22 2011

Fingerprint

Nanoribbons
Carbon Nanotubes
Graphite
Transparency
Graphene
Electrolytes
graphene
solar cells
dyes
electrolytes
Photocurrents
photocurrents
bleaching
Bleaching
Conversion efficiency
counters
Photoelectric cells
photoelectric cells
Electrodes
electrodes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Velten, J. A., Carretero-González, J., Castillo-Martínez, E., Bykova, J., Cook, A., Baughman, R., & Zakhidov, A. (2011). Photoinduced optical transparency in dye-sensitized solar cells containing graphene nanoribbons. Journal of Physical Chemistry C, 115(50), 25125-25131. https://doi.org/10.1021/jp2069946

Photoinduced optical transparency in dye-sensitized solar cells containing graphene nanoribbons. / Velten, Josef Aaron; Carretero-González, Javier; Castillo-Martínez, Elizabeth; Bykova, Julia; Cook, Alex; Baughman, Ray; Zakhidov, Anvar.

In: Journal of Physical Chemistry C, Vol. 115, No. 50, 22.12.2011, p. 25125-25131.

Research output: Contribution to journalArticle

Velten, JA, Carretero-González, J, Castillo-Martínez, E, Bykova, J, Cook, A, Baughman, R & Zakhidov, A 2011, 'Photoinduced optical transparency in dye-sensitized solar cells containing graphene nanoribbons', Journal of Physical Chemistry C, vol. 115, no. 50, pp. 25125-25131. https://doi.org/10.1021/jp2069946
Velten JA, Carretero-González J, Castillo-Martínez E, Bykova J, Cook A, Baughman R et al. Photoinduced optical transparency in dye-sensitized solar cells containing graphene nanoribbons. Journal of Physical Chemistry C. 2011 Dec 22;115(50):25125-25131. https://doi.org/10.1021/jp2069946
Velten, Josef Aaron ; Carretero-González, Javier ; Castillo-Martínez, Elizabeth ; Bykova, Julia ; Cook, Alex ; Baughman, Ray ; Zakhidov, Anvar. / Photoinduced optical transparency in dye-sensitized solar cells containing graphene nanoribbons. In: Journal of Physical Chemistry C. 2011 ; Vol. 115, No. 50. pp. 25125-25131.
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