中国物理B ›› 2005, Vol. 14 ›› Issue (10): 2137-2140.doi: 10.1088/1009-1963/14/10/036

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Ultrafast carrier dynamics in purified and as-grown single-walled carbon nanotube films

宋礼1, 解思深1, 汪国平2, 龙拥兵3, 张春雨4, 汪力4, 傅盘铭4, 张治国4   

  1. (1)Center for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China; (2)Department of Physics, Wuhan University, Wuhan 430072, China; (3)Department of Physics, Wuhan University, Wuhan 430072, China;Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; (4)Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2005-02-03 修回日期:2005-06-16 出版日期:2005-10-20 发布日期:2005-10-20
  • 基金资助:
    Project supported by the Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences.

Ultrafast carrier dynamics in purified and as-grown single-walled carbon nanotube films

Long Yong-Bing (龙拥兵)ab, Song Li (宋礼)c, Zhang Chun-Yu (张春雨)b, Wang Li (汪力)b, Fu Pan-Ming (傅盘铭)b, Zhang Zhi-Guo (张治国)b, Xie Si-Shen (解思深)c, Wang Guo-Ping (汪国平)a #br#   

  1. a Department of Physics, Wuhan University, Wuhan 430072, China; b Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; c Center for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China
  • Received:2005-02-03 Revised:2005-06-16 Online:2005-10-20 Published:2005-10-20
  • Supported by:
    Project supported by the Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences.

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摘要： Ultrafast time-resolved optical transmissions in purified and as-grown single-walled carbon nanotube films are measured at a temperature of 200K.The signal of the purified sample shows a crossover from photobleaching to photoabsorption. The former and the latter are interpreted as the state filling and the red shift of the $\pi$-plasmon, respectively. The signal of the as-grown sample can be perfectly fitted by a single-exponential with a time constant of 232fs. The disappearance of the negative component in the as-grown sample is attributed to the charge transfer between the semiconducting nanotubes and the impurities.

关键词: carbon nanotubes, carrier dynamics, ∏-plasmon resonance, charge transfer

Abstract: Ultrafast time-resolved optical transmissions in purified and as-grown single-walled carbon nanotube films are measured at a temperature of 200K.The signal of the purified sample shows a crossover from photobleaching to photoabsorption. The former and the latter are interpreted as the state filling and the red shift of the $\pi$-plasmon, respectively. The signal of the as-grown sample can be perfectly fitted by a single-exponential with a time constant of 232fs. The disappearance of the negative component in the as-grown sample is attributed to the charge transfer between the semiconducting nanotubes and the impurities.

Key words: carbon nanotubes, carrier dynamics, $\pi$-plasmon resonance, charge transfer

中图分类号:  (Spectroscopy of solid state dynamics)

  • 78.47.-p
78.67.Ch (Nanotubes) 78.66.-w (Optical properties of specific thin films) 73.50.Gr (Charge carriers: generation, recombination, lifetime, trapping, mean free paths) 78.30.-j (Infrared and Raman spectra) 68.55.Ln (Defects and impurities: doping, implantation, distribution, concentration, etc.)