Toward efficient carbon nanotube/P3HT solar cells: Active layer morphology, electrical, and optical properties

Shenqiang Ren, Marco Bernardi, Richard R. Lunt, Vladimir Bulovic, Jeffrey C. Grossman, Silvija Gradečak

Research output: Contribution to journalArticle

  • 128 Citations

Abstract

We demonstrate single-walled carbon nanotube (SWCNT)/P3HT polymer bulk heterojunction solar cells with an AM1.5 efficiency of 0.72%, significantly higher than previously reported (0.05%). A key step in achieving high efficiency is the utilization of semiconducting SWCNTs coated with an ordered P3HT layer to enhance the charge separation and transport in the device active layer. Electrical characteristics of devices with SWCNT concentrations up to 40 wt % were measured and are shown to be strongly dependent on the SWCNT loading. A maximum open circuit voltage was measured for SWCNT concentration of 3 wt % with a value of 1.04 V, higher than expected based on the interface band alignment. Modeling of the open-circuit voltage suggests that despite the large carrier mobility in SWCNTs device power conversion efficiency is governed by carrier recombination. Optical characterization shows that only SWCNT with diameter of 1.3-1.4 nm can contribute to the photocurrent with internal quantum efficiency up to 26%. Our results advance the fundamental understanding and improve the design of efficient polymer/SWCNTs solar cells.

Original languageEnglish (US)
Pages (from-to)5316-5321
Number of pages6
JournalNano Letters
Volume11
Issue number12
DOIs
StatePublished - Dec 14 2011
Externally publishedYes

Profile

Single-walled carbon nanotubes (SWCN)
carbon nanotubes
Solar cells
solar cells
Open circuit voltage
Polymers
Optic Atrophy
open circuit voltage
polymers
Carrier mobility
Photocurrents
Quantum efficiency
Conversion efficiency
Heterojunctions
Carbon nanotubes
Electric properties
Optical properties
Conjunctival Diseases
Etidocaine
Computing Methodologies

Keywords

  • Carbon nanotube
  • dark saturation current
  • open-circuit voltage
  • organic photovoltaics
  • P3HT

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Ren, S., Bernardi, M., Lunt, R. R., Bulovic, V., Grossman, J. C., & Gradečak, S. (2011). Toward efficient carbon nanotube/P3HT solar cells: Active layer morphology, electrical, and optical properties. Nano Letters, 11(12), 5316-5321. DOI: 10.1021/nl202796u

Toward efficient carbon nanotube/P3HT solar cells : Active layer morphology, electrical, and optical properties. / Ren, Shenqiang; Bernardi, Marco; Lunt, Richard R.; Bulovic, Vladimir; Grossman, Jeffrey C.; Gradečak, Silvija.

In: Nano Letters, Vol. 11, No. 12, 14.12.2011, p. 5316-5321.

Research output: Contribution to journalArticle

Ren, S, Bernardi, M, Lunt, RR, Bulovic, V, Grossman, JC & Gradečak, S 2011, 'Toward efficient carbon nanotube/P3HT solar cells: Active layer morphology, electrical, and optical properties' Nano Letters, vol 11, no. 12, pp. 5316-5321. DOI: 10.1021/nl202796u
Ren S, Bernardi M, Lunt RR, Bulovic V, Grossman JC, Gradečak S. Toward efficient carbon nanotube/P3HT solar cells: Active layer morphology, electrical, and optical properties. Nano Letters. 2011 Dec 14;11(12):5316-5321. Available from, DOI: 10.1021/nl202796u

Ren, Shenqiang; Bernardi, Marco; Lunt, Richard R.; Bulovic, Vladimir; Grossman, Jeffrey C.; Gradečak, Silvija / Toward efficient carbon nanotube/P3HT solar cells : Active layer morphology, electrical, and optical properties.

In: Nano Letters, Vol. 11, No. 12, 14.12.2011, p. 5316-5321.

Research output: Contribution to journalArticle

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