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Issue 34, 2016
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An improvement of performance in n-channel organic field effect transistors with N-phenyl[60]fulleropyrrolidines by molecular doping

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Abstract

The high performance of soluble [60]fulleropyrrolidine upon its use as the active layer of n-channel organic field-effect transistors (OFETs) is reported. The two materials, N-phenyl derivatives C60-fused-N-phenyl-2-phenylpyrrolidine ([C60]PhNPh) and C60-fused N-phenyl-2-hexylpyrrolidine ([C60]HexNPh), have well-controlled molecular structures with a modification of the pyrrolidine ring, with no increase in the LUMO level, achieving a high mobility and highly ambient stable n-type OFET. The top-gate, bottom-contact device shows a high electron charge-carrier mobility of up to 0.14 and 0.08 cm2 V−1 s−1 for [C60]PhNPh and [C60]HexNPh, respectively, (Ion/Ioff = 106) with the commonly used CYTOP dielectric. Excess carriers introduced by a small amount of chemical doping of polyethyleneimine (PEI) compensate traps by shifting the Fermi level (EF) toward the respective transport energy levels and therefore increase charge-carrier mobility (0.26 and 0.1 cm2 V−1 s−1) and provide good ambient operational stability compared with pristine devices.

Graphical abstract: An improvement of performance in n-channel organic field effect transistors with N-phenyl[60]fulleropyrrolidines by molecular doping

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Supplementary files

Article information


Submitted
02 May 2016
Accepted
30 Jul 2016
First published
30 Jul 2016

Phys. Chem. Chem. Phys., 2016,18, 23904-23909
Article type
Paper

An improvement of performance in n-channel organic field effect transistors with N-phenyl[60]fulleropyrrolidines by molecular doping

D. X. Long, M. Karakawa and Y. Noh, Phys. Chem. Chem. Phys., 2016, 18, 23904 DOI: 10.1039/C6CP02940J

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