Time Dependent Parallel Resistance in an Organic Schottky Contact


The DC characteristics of a Schottky contact between regioregular poly (3-hexylthiophene) and aluminum are studied in forward and reverse bias regimes. Current-voltage curves of the junction in reverse bias show a resistive path in parallel with the expected Schottky contact. This is the sign of a nonuniform junction between the metal and semiconductor that exhibits ohmic behavior in some regions. Reduction of this parallel resistance and degradation of the Schottky junction are observed over a period of two weeks. Accumulation of undesired ions in the polymer or diffusion of aluminum atoms into the semiconductor are two possible mechanisms which may explain the time dependent behavior of these Schottky junctions.

This is a preview of subscription content, access via your institution.


  1. 1

    W. Brutting, S. Berleb, A.G. Muckl, Organic Electronics 2(2001) 1–36.

    CAS  Article  Google Scholar 

  2. 2

    Z. Chiguvare, J. Parisi, V. Dyakonov, J. Appl. Phys. 94, 2440 (2003).

    CAS  Article  Google Scholar 

  3. 3

    G.L.A. Rikken, D. Braun, E.G.J. Staring, R. Demandt, Appl. Phys. Lett. 65, 219 (1994).

    CAS  Article  Google Scholar 

  4. 4

    S. M. Sze, “Physics of Semiconductor Devices”, 2nd ed, John Wiley, 1981.

  5. 5

    E.J.Meijer, C. Detcheverry, P.J. Baesjou, E.van Veenendaal, D.M.de Leeuw, T.M. Klawijk, J. Appl. Phys. 93, 4831 (2003)

    CAS  Article  Google Scholar 

  6. 6

    R.H. Friend, R.W. Gymer, A.B. Holmes, J.H. Burroughes, R.N. Marks, C. Taliani, D.D.C. Bradley, D.A. Dos Santos, J.L. Bredas, M. Logdlund, W.R. Salaneck, Nature 397, 121(1999).

    CAS  Article  Google Scholar 

  7. 7

    J.M. Shaw, P.F. Seidler, IBM J. RES & DEV, Vol. 45, No 1, 3–9 (2001).

    CAS  Article  Google Scholar 

  8. 8

    H. Koezuka, A. Tsumra, H. Fuchigaml, K. Kuramoto, Appl. Phys. Lett. 62, 1794 (1993).

    CAS  Article  Google Scholar 

  9. 9

    A.M. Aleshin, H. Sandberg, H. Stubb, Synthetic Metals 121 (2001) 1449–1450.

    CAS  Article  Google Scholar 

  10. 10

    M. Fujihira, L.M. Do, A. Koike, E. M. Han, Appl. Phys. Lett. 68, 1787 (1996).

    CAS  Article  Google Scholar 

  11. 11

    M. Schaer, F. Nüesch, D. Berner, W. Leo, L. Zuppiroli, Adv. Funct. Mater. 2001, 11, No. 2, 116–121.

    CAS  Article  Google Scholar 

  12. 12

    P.E. Burrows, V. Bulovic, S.R. Forrest, L.S. Sapochak, D.M. McCarty, M.E. Thompson, Appl. Phys. Lett. 65 (23) 2922 (1994).

    CAS  Article  Google Scholar 

Download references

Author information



Corresponding author

Correspondence to Arash Takshi.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Takshi, A., Madden, J.D., Fok, C.W.E. et al. Time Dependent Parallel Resistance in an Organic Schottky Contact. MRS Online Proceedings Library 871, 335 (2005). https://doi.org/10.1557/PROC-871-I3.35

Download citation