Thermionic emission and tunneling at carbon nanotube-organic semiconductor interface

ACS Nano
Biddut K Sarker, Saiful I Khondaker

Abstract

We study the charge carrier injection mechanism across the carbon nanotube (CNT)-organic semiconductor interface using a densely aligned carbon nanotube array as electrode and pentacene as organic semiconductor. The current density-voltage (J-V) characteristics measured at different temperatures show a transition from a thermal emission mechanism at high temperature (above 200 K) to a tunneling mechanism at low temperature (below 200 K). A barrier height of ∼0.16 eV is calculated from the thermal emission regime, which is much lower compared to the metal/pentacene devices. At low temperatures, the J-V curves exhibit a direct tunneling mechanism at low bias, corresponding to a trapezoidal barrier, while at high bias the mechanism is well described by Fowler-Nordheim tunneling, which corresponds to a triangular barrier. A transition from direct tunneling to Fowler-Nordheim tunneling further signifies a small injection barrier at the CNT/pentacene interface. Our results presented here are the first direct experimental evidence of low charge carrier injection barrier between CNT electrodes and an organic semiconductor and are a significant step forward in realizing the overall goal of using CNT electrodes in organic electronics.

References

Aug 9, 2003·Nature·Ali JaveyHongjie Dai
Mar 6, 2004·Physical Review Letters·J AppenzellerPh Avouris
Sep 24, 2004·Journal of the American Chemical Society·Pengfei QiHongjie Dai
Aug 16, 2006·Physical Review Letters·Jeremy M BeebeJames G Kushmerick
Apr 21, 2010·ACS Nano·Zheyuan ChenLouis E Brus
Dec 15, 2010·ACS Nano·Fabio CicoiraRichard Martel
Feb 18, 2011·ACS Nano·Shashank ShekharSaiful I Khondaker

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Citations

May 4, 2013·Nanoscale·Irina ValitovaFabio Cicoira
Jan 26, 2016·Advanced Materials·Xiaochi LiuWon Jong Yoo
Jan 5, 2016·Physical Chemistry Chemical Physics : PCCP·Rahul K Sharma Deepak
Jun 18, 2015·ACS Applied Materials & Interfaces·Jiye KimChan Eon Park
Sep 15, 2018·Nanotechnology·Mawin Martinez MartínezAntonio Riul
May 1, 2015·Nanoscale·Faisal AhmedWon Jong Yoo
Feb 9, 2021·Nanotechnology·Hai Yen Le ThiGil-Ho Kim
Feb 23, 2020·ACS Applied Materials & Interfaces·Seung-Hoon LeeSung Cheol Yoon

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