We demonstrate a complementary-like inverter comprised of two identical ambipolar field-effect transistors based on the solution processable methanofullerene [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). The transistors are capable of operating in both the p- and n-channel regimes depending upon the bias conditions. However, in the p-channel regime transistor operation is severely contact limited. We attribute this to the presence of a large injection barrier for holes at the Au/PCBM interface. Despite this barrier the inverter operates in both the first and third quadrant of the voltage output versus voltage input plot exhibiting a maximum gain in the order of 20. Since the inverter represents the basic building block of most logic circuits we anticipate that other complementary-like circuits can be realized by this approach.
Bibliographical noteFunding Information:
T.D.A. gratefully acknowledges financial support from the EC under Project No. HPRN-CT-2002-00327 (EUROFET). The work of C.T. forms part of the research programme of the Dutch Polymer Institute Project No. 276.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)