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Title: Microsecond charge separation at heterojunctions between transition metal dichalcogenide monolayers and single-walled carbon nanotubes

Abstract

The use of monolayer transition metal dichalcogenides (TMDCs) for optical-to-electrical or optical-to-chemical energy conversion can be limited by the ultrafast excited state relaxation inherent to neat monolayers. Photoinduced charge separation at nanoscale heterojunctions is an important strategy to extend carrier lifetimes, enabling photodetectors, solar cells, and solar fuel production with these ultrathin materials. We demonstrate TMDC/single-walled carbon nanotube (SWCNT) heterojunctions with exceptionally long, microsecond timescale, charge separation following sub-picosecond interfacial charge transfer. These carrier lifetimes are orders of magnitude longer-lived than in other monolayer TMDC heterojunctions. We further present two unique methodologies for estimating charge-transfer quantum yields in MoS2 that can be broadly applied and refined for other TMDC systems. Our results highlight the promise of TMDC/SWCNT heterojunctions for advanced (photo)catalytic and optoelectronic systems and devices.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
+ Show Author Affiliations
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1543254
Alternate Identifier(s):
OSTI ID: 1543166
Report Number(s):
NREL/JA-5K00-74336
Journal ID: ISSN 2051-6347; MHAOAL
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Materials Horizons
Additional Journal Information:
Journal Volume: none; Journal Issue: none; Journal ID: ISSN 2051-6347
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; energy conversion; monolayers; charge separation; transition metal dichalcogenides

Citation Formats

Sulas-Kern, Dana B., Zhang, Hanyu, Li, Zhaodong, and Blackburn, Jeffrey L. Microsecond charge separation at heterojunctions between transition metal dichalcogenide monolayers and single-walled carbon nanotubes. United States: N. p., 2019. Web. doi:10.1039/C9MH00954J.
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Sulas-Kern, Dana B., Zhang, Hanyu, Li, Zhaodong, & Blackburn, Jeffrey L. Microsecond charge separation at heterojunctions between transition metal dichalcogenide monolayers and single-walled carbon nanotubes. United States. https://doi.org/10.1039/C9MH00954J
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Sulas-Kern, Dana B., Zhang, Hanyu, Li, Zhaodong, and Blackburn, Jeffrey L. Tue . "Microsecond charge separation at heterojunctions between transition metal dichalcogenide monolayers and single-walled carbon nanotubes". United States. https://doi.org/10.1039/C9MH00954J. https://www.osti.gov/servlets/purl/1543254.
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@article{osti_1543254,
title = {Microsecond charge separation at heterojunctions between transition metal dichalcogenide monolayers and single-walled carbon nanotubes},
author = {Sulas-Kern, Dana B. and Zhang, Hanyu and Li, Zhaodong and Blackburn, Jeffrey L.},
abstractNote = {The use of monolayer transition metal dichalcogenides (TMDCs) for optical-to-electrical or optical-to-chemical energy conversion can be limited by the ultrafast excited state relaxation inherent to neat monolayers. Photoinduced charge separation at nanoscale heterojunctions is an important strategy to extend carrier lifetimes, enabling photodetectors, solar cells, and solar fuel production with these ultrathin materials. We demonstrate TMDC/single-walled carbon nanotube (SWCNT) heterojunctions with exceptionally long, microsecond timescale, charge separation following sub-picosecond interfacial charge transfer. These carrier lifetimes are orders of magnitude longer-lived than in other monolayer TMDC heterojunctions. We further present two unique methodologies for estimating charge-transfer quantum yields in MoS2 that can be broadly applied and refined for other TMDC systems. Our results highlight the promise of TMDC/SWCNT heterojunctions for advanced (photo)catalytic and optoelectronic systems and devices.},
doi = {10.1039/C9MH00954J},
journal = {Materials Horizons},
number = none,
volume = none,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 2019},
month = {Tue Jan 01 00:00:00 EST 2019}
}
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Journal Article:
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https://doi.org/10.1039/C9MH00954J
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