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Title: Extracting electrode space charge limited current: Charge injection into conjugated polyelectrolytes with a semiconductor electrode

Abstract

Conjugated polyelectrolytes and related mixed ionic-electronic conductors (MIECs) are being explored for energy applications including solid-state lighting and photovoltaics. Fundamental models of charge injection into MIECs have been primarily developed for MIECs contacted with highly conductive or metal electrodes (MEs), despite many potential applications involving semiconductors. We theoretically and experimentally demonstrate that an appropriate semiconductor electrode (SE), n-type for electron or p-type of hole injection, can limit injection into MIECs. When the SE is the injecting electrode and is under accumulation, there is little difference from a ME. When the SE acts as the extracting electrode, however, injection into the MIEC can be limited because a fraction of any applied bias must support charge depletion in the semiconductor rather than charge injection into the MIEC. In a ME/MIEC/SE system, this can lead to significant asymmetry in current-voltage and injected charge-voltage behavior.

Authors:
 [1]; ORCiD logo [1]
  1. Univ. of Oregon, Eugene, OR (United States). Dept. of Chemistry
Publication Date:
Research Org.:
Univ. of Oregon, Eugene, OR (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1471494
Alternate Identifier(s):
OSTI ID: 1254196
Grant/Contract Number:  
SC0012363
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 21; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Walker, Ethan M., and Lonergan, Mark C. Extracting electrode space charge limited current: Charge injection into conjugated polyelectrolytes with a semiconductor electrode. United States: N. p., 2016. Web. doi:10.1063/1.4951676.
Walker, Ethan M., & Lonergan, Mark C. Extracting electrode space charge limited current: Charge injection into conjugated polyelectrolytes with a semiconductor electrode. United States. doi:10.1063/1.4951676.
Walker, Ethan M., and Lonergan, Mark C. Mon . "Extracting electrode space charge limited current: Charge injection into conjugated polyelectrolytes with a semiconductor electrode". United States. doi:10.1063/1.4951676. https://www.osti.gov/servlets/purl/1471494.
@article{osti_1471494,
title = {Extracting electrode space charge limited current: Charge injection into conjugated polyelectrolytes with a semiconductor electrode},
author = {Walker, Ethan M. and Lonergan, Mark C.},
abstractNote = {Conjugated polyelectrolytes and related mixed ionic-electronic conductors (MIECs) are being explored for energy applications including solid-state lighting and photovoltaics. Fundamental models of charge injection into MIECs have been primarily developed for MIECs contacted with highly conductive or metal electrodes (MEs), despite many potential applications involving semiconductors. We theoretically and experimentally demonstrate that an appropriate semiconductor electrode (SE), n-type for electron or p-type of hole injection, can limit injection into MIECs. When the SE is the injecting electrode and is under accumulation, there is little difference from a ME. When the SE acts as the extracting electrode, however, injection into the MIEC can be limited because a fraction of any applied bias must support charge depletion in the semiconductor rather than charge injection into the MIEC. In a ME/MIEC/SE system, this can lead to significant asymmetry in current-voltage and injected charge-voltage behavior.},
doi = {10.1063/1.4951676},
journal = {Applied Physics Letters},
number = 21,
volume = 108,
place = {United States},
year = {2016},
month = {5}
}

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