Improved injection in n-type organic transistors with conjugated polyelectrolytes.
To improve injection in n-type organic thin film transistors (OTFTs), a thin conjugated polyelectrolyte (CPE) layer was interposed between electrodes and the semiconductor layer. OTFTs were fabricated with [6,6]-phenyl-C(61) butyric acid methyl ester (PCBM) and Au source and drain contacts. We demonstrate that the insertion of CPEs beneath top-contact Au source/drain electrodes can be a very effective strategy for improving the carrier injection and reducing turn-on threshold voltages of n-channel OTFTs. Ultraviolet photoemission spectroscopy (UPS) indicates that the decrease of the electron injection barrier is consistent with organized dipoles at the metal/organic interface.
Seo
Jung Hwa
JH
Center for Polymers and Organic Solids, University of California, Santa Barbara, California 93106, USA.
Gutacker
Andrea
A
Walker
Bright
B
Cho
Shinuk
S
Garcia
Andres
A
Yang
Renqiang
R
Nguyen
Thuc-Quyen
TQ
Heeger
Alan J
AJ
Bazan
Guillermo C
GC