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Why aggregated carbon nanotubes exhibit low quantum efficiency.

Yu-Hsien Lin1, Yao-Cheng Lai, Ching-Tung Hsu

  • 1Department of Materials Science and Engineering, National Tsing Hua University, HsinChu 30013, Taiwan.

Physical Chemistry Chemical Physics : PCCP
|March 15, 2011
PubMed
Summary

Carbon nanotube aggregation lowers quantum efficiency due to photocurrent leakage via oxygenated lattices. This finding, supported by calculations and experiments, explains efficiency loss in carbon nanotube applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Carbon nanotubes (CNTs) are promising nanomaterials for optoelectronic devices.
  • Aggregation of CNTs is a known issue that negatively impacts their performance.
  • Understanding the mechanisms behind efficiency reduction in aggregated CNTs is crucial for device optimization.

Purpose of the Study:

  • To investigate the relationship between carbon nanotube aggregation and reduced quantum efficiency.
  • To identify the specific mechanism responsible for photocurrent leakage in aggregated CNT systems.
  • To provide experimental and computational evidence for the proposed mechanism.

Main Methods:

  • Computational modeling and theoretical calculations were employed to simulate electron transport.

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  • Optical excitation experiments were conducted to measure quantum efficiency.
  • Analysis of the CNT lattice structure, particularly oxygenation, was performed.

    • Main Results:

    • Carbon nanotube aggregation was confirmed to reduce quantum efficiency.
    • Photocurrent leakage was identified as the primary cause of efficiency loss.
    • Oxygenated lattice sites within the CNTs were found to act as low-barrier intertube channels facilitating leakage.

    Conclusions:

    • The aggregation-induced reduction in quantum efficiency is attributed to photocurrent leakage.
    • Oxygenated lattices in aggregated CNTs create efficient pathways for charge carrier loss.
    • Controlling CNT aggregation and surface oxygenation is key to enhancing optoelectronic device performance.