Distinguishing between nonlinear channel transport and contact effects in organic FETs

B. H. Hamadani; J. L. LeBoeuf; R. J. Kline; I. McCulloch; M. Heeney; C. A. Richter; L. J. Richter; D. J. Gundlach

doi:10.1117/12.734433

Distinguishing between nonlinear channel transport and contact effects in organic FETs

B. H. Hamadani, J. L. LeBoeuf, R. J. Kline, I. McCulloch, M. Heeney, C. A. Richter, L. J. Richter, D. J. Gundlach

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

3 Scopus citations

Abstract

We investigate charge injection and transport in organic field-effect transistors fabricated by using poly(2,5-bis(3-tetradecylthiophene-2-yl) thieno[3,2-b]thiophene) (pBTTT-C14) or poly(3-hexylthiophene) (P3HT) as the active polymer layer. We show that in high mobility devices where the channel resistances are low compared to the contact resistances, the device performance can be dominated by the metal/organic semiconductor (OSC) contacts. However, in sets of devices where the channel resistance is dominant over the contacts (usually the lower mobility devices), we see pronounced field dependence in the saturation regime mobilities consistent with a Poole-Frenkel model of charge transport within the channel. The field-dependent mobility in short-channel devices produces nonlinear output current-voltage characteristics which can be modeled consistently in the Poole-Frenkel framework.

Original language	English (US)
Title of host publication	Proceedings of SPIE - The International Society for Optical Engineering
DOIs	https://doi.org/10.1117/12.734433
State	Published - Dec 1 2007
Externally published	Yes

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@inproceedings{acc058ee30e449ce8e42ad02b9845325,

title = "Distinguishing between nonlinear channel transport and contact effects in organic FETs",

abstract = "We investigate charge injection and transport in organic field-effect transistors fabricated by using poly(2,5-bis(3-tetradecylthiophene-2-yl) thieno[3,2-b]thiophene) (pBTTT-C14) or poly(3-hexylthiophene) (P3HT) as the active polymer layer. We show that in high mobility devices where the channel resistances are low compared to the contact resistances, the device performance can be dominated by the metal/organic semiconductor (OSC) contacts. However, in sets of devices where the channel resistance is dominant over the contacts (usually the lower mobility devices), we see pronounced field dependence in the saturation regime mobilities consistent with a Poole-Frenkel model of charge transport within the channel. The field-dependent mobility in short-channel devices produces nonlinear output current-voltage characteristics which can be modeled consistently in the Poole-Frenkel framework.",

author = "Hamadani, {B. H.} and LeBoeuf, {J. L.} and Kline, {R. J.} and I. McCulloch and M. Heeney and Richter, {C. A.} and Richter, {L. J.} and Gundlach, {D. J.}",

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year = "2007",

month = dec,

day = "1",

doi = "10.1117/12.734433",

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T1 - Distinguishing between nonlinear channel transport and contact effects in organic FETs

AU - Hamadani, B. H.

AU - LeBoeuf, J. L.

AU - Kline, R. J.

AU - McCulloch, I.

AU - Heeney, M.

AU - Richter, C. A.

AU - Richter, L. J.

AU - Gundlach, D. J.

N1 - Generated from Scopus record by KAUST IRTS on 2023-02-14

PY - 2007/12/1

Y1 - 2007/12/1

N2 - We investigate charge injection and transport in organic field-effect transistors fabricated by using poly(2,5-bis(3-tetradecylthiophene-2-yl) thieno[3,2-b]thiophene) (pBTTT-C14) or poly(3-hexylthiophene) (P3HT) as the active polymer layer. We show that in high mobility devices where the channel resistances are low compared to the contact resistances, the device performance can be dominated by the metal/organic semiconductor (OSC) contacts. However, in sets of devices where the channel resistance is dominant over the contacts (usually the lower mobility devices), we see pronounced field dependence in the saturation regime mobilities consistent with a Poole-Frenkel model of charge transport within the channel. The field-dependent mobility in short-channel devices produces nonlinear output current-voltage characteristics which can be modeled consistently in the Poole-Frenkel framework.

AB - We investigate charge injection and transport in organic field-effect transistors fabricated by using poly(2,5-bis(3-tetradecylthiophene-2-yl) thieno[3,2-b]thiophene) (pBTTT-C14) or poly(3-hexylthiophene) (P3HT) as the active polymer layer. We show that in high mobility devices where the channel resistances are low compared to the contact resistances, the device performance can be dominated by the metal/organic semiconductor (OSC) contacts. However, in sets of devices where the channel resistance is dominant over the contacts (usually the lower mobility devices), we see pronounced field dependence in the saturation regime mobilities consistent with a Poole-Frenkel model of charge transport within the channel. The field-dependent mobility in short-channel devices produces nonlinear output current-voltage characteristics which can be modeled consistently in the Poole-Frenkel framework.

UR - http://proceedings.spiedigitallibrary.org/proceeding.aspx?doi=10.1117/12.734433

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U2 - 10.1117/12.734433

DO - 10.1117/12.734433

M3 - Conference contribution

SN - 9780819468062

BT - Proceedings of SPIE - The International Society for Optical Engineering

ER -

Distinguishing between nonlinear channel transport and contact effects in organic FETs

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