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Title: Photoinduced Spontaneous Free-Carrier Generation in Semiconducting Single-Walled Carbon Nanotubes

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms9809· OSTI ID:1227714
 [1];  [2];  [1];  [2]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)

The strong quantum confinement and low dielectric screening impart single-walled carbon nanotubes with exciton-binding energies substantially exceeding kBT at room temperature. Despite these large binding energies, reported photoluminescence quantum yields are typically low and some studies suggest that photoexcitation of carbon nanotube excitonic transitions can produce free charge carriers. Here we report the direct measurement of long-lived free-carrier generation in chirality-pure, single-walled carbon nanotubes in a low dielectric solvent. Time-resolved microwave conductivity enables contactless and quantitative measurement of the real and imaginary photoconductance of individually suspended nanotubes. We found that the conditions of the microwave conductivity measurement allow us to avoid the complications of most previous measurements of nanotube free-carrier generation, including tube–tube/tube–electrode contact, dielectric screening by nearby excitons and many-body interactions. At low photon fluence (approximately 0.05 excitons per μm length of tubes), we directly observe free carriers on excitation of the first and second carbon nanotube exciton transitions.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1227714
Report Number(s):
NREL/JA-5900-64645; MainId:11995; UUID:08b8fde6-4a20-e511-8e4e-d89d67132a6d; MainAdminID:475
Journal Information:
Nature Communications, Vol. 6; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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Cited By (11)

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Control of Shell Morphology in p-n Heterostructured Water-Processable Semiconductor Colloids: Toward Extremely Efficient Charge Separation journal November 2018
Direct–indirect character of the bandgap in methylammonium lead iodide perovskite journal October 2016
Carrier photogeneration, drift and recombination in a semiconducting carbon nanotube network journal January 2017
Redox-active nanomaterials for nanomedicine applications journal January 2017
Recombination at high carrier density in methylammonium lead iodide studied using time-resolved microwave conductivity journal August 2017
Quantitative analysis of time-resolved microwave conductivity data journal November 2017
Planar microwave resonator with electrodeposited ZnO thin film for ultraviolet detection journal December 2019
Direct-indirect character of the bandgap in methylammonium lead iodide perovskite. text January 2017
Diameter-Dependent Optical Absorption and Excitation Energy Transfer from Encapsulated Dye Molecules toward Single-Walled Carbon Nanotubes journal July 2018