Observation of negative and positive trions in the electrochemically carrier-doped single-walled carbon nanotubes

Jin Sung Park, Yasuhiko Hirana, Shinichiro Mouri, Yuhei Miyauchi, Naotoshi Nakashima, Kazunari Matsuda

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Understanding of electronic and optical features of single-walled carbon nanotubes (SWNTs) has been a central issue in science and nanotechnology of carbon nanotubes. We describe the detection of both the positive trion (positively charged exciton) and negative trion (negatively charged exciton) as a three-particle bound state in the SWNTs at room temperature by an in situ photoluminescence spectroelectrochemistry method for an isolated SWNT film cast on an ITO electrode. The electrochemical hole and electron dopings enable us to detect such trions on the SWNTs. The large energy difference between the singlet bright exciton and the negative and positive trions showing a tube diameter dependence is determined by both the exchange splitting energy and the trion binding energy. In contrast to conventional compound semiconductors, on the SWNTs, the negative trion has almost the same binding energy to the positive trion, which is attributed to nearly identical effective masses of the holes and electrons.

Original languageEnglish
Pages (from-to)14461-14466
Number of pages6
JournalJournal of the American Chemical Society
Volume134
Issue number35
DOIs
Publication statusPublished - Sep 5 2012

Fingerprint

Carbon Nanotubes
Single-walled carbon nanotubes (SWCN)
Observation
Excitons
Binding energy
Spectroelectrochemistry
Electrons
Semiconductors
Nanotechnology
Carbon nanotubes
Photoluminescence
Doping (additives)
Semiconductor materials
Electrodes
Temperature
LDS 751

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Observation of negative and positive trions in the electrochemically carrier-doped single-walled carbon nanotubes. / Park, Jin Sung; Hirana, Yasuhiko; Mouri, Shinichiro; Miyauchi, Yuhei; Nakashima, Naotoshi; Matsuda, Kazunari.

In: Journal of the American Chemical Society, Vol. 134, No. 35, 05.09.2012, p. 14461-14466.

Research output: Contribution to journalArticle

Park, Jin Sung ; Hirana, Yasuhiko ; Mouri, Shinichiro ; Miyauchi, Yuhei ; Nakashima, Naotoshi ; Matsuda, Kazunari. / Observation of negative and positive trions in the electrochemically carrier-doped single-walled carbon nanotubes. In: Journal of the American Chemical Society. 2012 ; Vol. 134, No. 35. pp. 14461-14466.
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