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Title: Optically Generated Free-Carrier Collection from an All Single-Walled Carbon Nanotube Active Layer

Abstract

Semiconducting single-walled carbon nanotubes' (SWCNTs) broad absorption range and all-carbon composition make them attractive materials for light harvesting. We report photoinduced charge transfer from both multichiral and single-chirality SWCNT films into atomically flat SnO2 and TiO2 crystals. Higher-energy second excitonic SWCNT transitions produce more photocurrent, demonstrating carrier injection rates are competitive with fast hot-exciton relaxation processes. A logarithmic relationship exists between photoinduced electron-transfer driving force and photocarrier collection efficiency, becoming more efficient with smaller diameter SWCNTs. Photocurrents are generated from both conventional sensitization and in the opposite direction with the semiconductor under accumulation and acting as an ohmic contact with only the p-type nanotubes. Finally, we demonstrate that SWCNT surfactant choice and concentration play a large role in photon conversion efficiency and present methods of maximizing photocurrent yields.

Authors:
 [1];  [2];  [3];  [2];  [3];  [2];  [2]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States); Univ. of Wyoming, Laramie, WY (United States)
  2. Univ. of Wyoming, Laramie, WY (United States)
  3. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1471478
Report Number(s):
NREL/JA-5900-71402
Journal ID: ISSN 1948-7185
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry Letters
Additional Journal Information:
Journal Volume: 9; Journal Issue: 17; Journal ID: ISSN 1948-7185
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; semiconducting single-walled carbon nanotubes; absorption; light harvesting

Citation Formats

Kubie, Lenore, Watkins, Kevin J., Ihly, Rachelle, Wladkowski, Henry V., Blackburn, Jeffrey L., Rice, William D., and Parkinson, Bruce A. Optically Generated Free-Carrier Collection from an All Single-Walled Carbon Nanotube Active Layer. United States: N. p., 2018. Web. doi:10.1021/acs.jpclett.8b01850.
Kubie, Lenore, Watkins, Kevin J., Ihly, Rachelle, Wladkowski, Henry V., Blackburn, Jeffrey L., Rice, William D., & Parkinson, Bruce A. Optically Generated Free-Carrier Collection from an All Single-Walled Carbon Nanotube Active Layer. United States. doi:10.1021/acs.jpclett.8b01850.
Kubie, Lenore, Watkins, Kevin J., Ihly, Rachelle, Wladkowski, Henry V., Blackburn, Jeffrey L., Rice, William D., and Parkinson, Bruce A. Tue . "Optically Generated Free-Carrier Collection from an All Single-Walled Carbon Nanotube Active Layer". United States. doi:10.1021/acs.jpclett.8b01850. https://www.osti.gov/servlets/purl/1471478.
@article{osti_1471478,
title = {Optically Generated Free-Carrier Collection from an All Single-Walled Carbon Nanotube Active Layer},
author = {Kubie, Lenore and Watkins, Kevin J. and Ihly, Rachelle and Wladkowski, Henry V. and Blackburn, Jeffrey L. and Rice, William D. and Parkinson, Bruce A.},
abstractNote = {Semiconducting single-walled carbon nanotubes' (SWCNTs) broad absorption range and all-carbon composition make them attractive materials for light harvesting. We report photoinduced charge transfer from both multichiral and single-chirality SWCNT films into atomically flat SnO2 and TiO2 crystals. Higher-energy second excitonic SWCNT transitions produce more photocurrent, demonstrating carrier injection rates are competitive with fast hot-exciton relaxation processes. A logarithmic relationship exists between photoinduced electron-transfer driving force and photocarrier collection efficiency, becoming more efficient with smaller diameter SWCNTs. Photocurrents are generated from both conventional sensitization and in the opposite direction with the semiconductor under accumulation and acting as an ohmic contact with only the p-type nanotubes. Finally, we demonstrate that SWCNT surfactant choice and concentration play a large role in photon conversion efficiency and present methods of maximizing photocurrent yields.},
doi = {10.1021/acs.jpclett.8b01850},
journal = {Journal of Physical Chemistry Letters},
number = 17,
volume = 9,
place = {United States},
year = {2018},
month = {8}
}

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Cited by: 3 works
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