Enhanced Ambipolar Charge Injection with Semiconducting Polymer/Carbon Nanotube Thin Films for Light-Emitting Transistors
Gwinner MC, Jakubka F, Gannott F, Sirringhaus H, Zaumseil J (2012)
Publication Type: Journal article
Publication year: 2012
Journal
Book Volume: 6
Pages Range: 539-548
Journal Issue: 1
DOI: 10.1021/nn203874a
Abstract
We investigate the influence of small amounts of semiconducting single-walled carbon nanotubes (SWNTs) dispersed in polyfluorenes such as poly(9,9-di-n-octylfluorene-alt-benzothiadiazole (F8BT) and poly(9,9-dioctylfluorene) (F8) on device characteristics of bottom contact/top gate ambipolar light-emitting field-effect transistors (LEFETs) based on these conjugated polymers. We find that the presence of SWNTs within the semiconducting layer at concentrations below the percolation limit significantly increases both hole and electron injection, even for a large band gap semiconductor like F8, without leading to significant luminescence quenching of the conjugated polymer. As a result of the reduced contact resistance and lower threshold voltages, larger ambipolar currents and thus brighter light emission are observed. We examine possible mechanisms of this effect such as energy level alignment, reduced bulk resistance above the contacts, and field-enhanced injection at the nanotube tips. The observed ambipolar injection improvement is applicable to most conjugated polymers in staggered transistor configurations or similar organic electronic devices where injection barriers are an issue.
Authors with CRIS profile
Florian Jakubka
Professur für Werkstoffwissenschaften (Computational Materials Microscopy)
Florentina Gannott
Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe)
Jana Zaumseil
Professur für Werkstoffwissenschaften (Computational Materials Microscopy)
Additional Organisation(s)
Involved external institutions
United Kingdom (GB)How to cite
APA:
Gwinner, M.C., Jakubka, F., Gannott, F., Sirringhaus, H., & Zaumseil, J. (2012). Enhanced Ambipolar Charge Injection with Semiconducting Polymer/Carbon Nanotube Thin Films for Light-Emitting Transistors. ACS nano, 6(1), 539-548. https://dx.doi.org/10.1021/nn203874a
MLA:
Gwinner, Michael C., et al. "Enhanced Ambipolar Charge Injection with Semiconducting Polymer/Carbon Nanotube Thin Films for Light-Emitting Transistors." ACS nano 6.1 (2012): 539-548.
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