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Title: Efficiency of Charge-Transfer Doping in Organic Semiconductors Probed with Quantitative Microwave and Direct-Current Conductance

Abstract

Although molecular charge-transfer doping is widely used to manipulate carrier density in organic semiconductors, only a small fraction of charge carriers typically escape the Coulomb potential of dopant counterions to contribute to electrical conductivity. Here, we utilize microwave and direct-current (DC) measurements of electrical conductivity to demonstrate that a high percentage of charge carriers in redox-doped semiconducting single-walled carbon nanotube (s-SWCNT) networks is delocalized as a free carrier density in the p-electron system (estimated as >46% at high doping densities). The microwave and four-point probe conductivities of hole-doped s-SWCNT films quantitatively match over almost 4 orders of magnitude in conductance, indicating that both measurements are dominated by the same population of delocalized carriers. We address the relevance of this surprising one-to-one correspondence by discussing the degree to which local environmental parameters (e.g., tube-tube junctions, Coulombic stabilization, and local bonding environment) may impact the relative magnitudes of each transport measurement.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]
  1. 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:
1484594
Report Number(s):
NREL/JA-5K00-72779
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Resource Relation:
Journal Name: The Journal of Physical Chemistry Letters; Journal Volume: 9
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Citation Formats

Blackburn, Jeffrey L, Ferguson, Andrew J, Reid, Obadiah G, Nanayakkara, Sanjini U, and Ihly, Rachelle R. Efficiency of Charge-Transfer Doping in Organic Semiconductors Probed with Quantitative Microwave and Direct-Current Conductance. United States: N. p., 2018. Web. doi:https://dx.doi.org/10.1021/acs.jpclett.8b03074.
Blackburn, Jeffrey L, Ferguson, Andrew J, Reid, Obadiah G, Nanayakkara, Sanjini U, & Ihly, Rachelle R. Efficiency of Charge-Transfer Doping in Organic Semiconductors Probed with Quantitative Microwave and Direct-Current Conductance. United States. doi:https://dx.doi.org/10.1021/acs.jpclett.8b03074.
Blackburn, Jeffrey L, Ferguson, Andrew J, Reid, Obadiah G, Nanayakkara, Sanjini U, and Ihly, Rachelle R. Tue . "Efficiency of Charge-Transfer Doping in Organic Semiconductors Probed with Quantitative Microwave and Direct-Current Conductance". United States. doi:https://dx.doi.org/10.1021/acs.jpclett.8b03074.
@article{osti_1484594,
title = {Efficiency of Charge-Transfer Doping in Organic Semiconductors Probed with Quantitative Microwave and Direct-Current Conductance},
author = {Blackburn, Jeffrey L and Ferguson, Andrew J and Reid, Obadiah G and Nanayakkara, Sanjini U and Ihly, Rachelle R},
abstractNote = {Although molecular charge-transfer doping is widely used to manipulate carrier density in organic semiconductors, only a small fraction of charge carriers typically escape the Coulomb potential of dopant counterions to contribute to electrical conductivity. Here, we utilize microwave and direct-current (DC) measurements of electrical conductivity to demonstrate that a high percentage of charge carriers in redox-doped semiconducting single-walled carbon nanotube (s-SWCNT) networks is delocalized as a free carrier density in the p-electron system (estimated as >46% at high doping densities). The microwave and four-point probe conductivities of hole-doped s-SWCNT films quantitatively match over almost 4 orders of magnitude in conductance, indicating that both measurements are dominated by the same population of delocalized carriers. We address the relevance of this surprising one-to-one correspondence by discussing the degree to which local environmental parameters (e.g., tube-tube junctions, Coulombic stabilization, and local bonding environment) may impact the relative magnitudes of each transport measurement.},
doi = {https://dx.doi.org/10.1021/acs.jpclett.8b03074},
journal = {The Journal of Physical Chemistry Letters},
number = ,
volume = 9,
place = {United States},
year = {Tue Nov 20 00:00:00 EST 2018},
month = {Tue Nov 20 00:00:00 EST 2018}
}