Charge transport in doped organic semiconductors is investigated, and an analytical conductivity model is proposed based on the variable range hopping theory. The model can well explain the superlinear increase of the conductivity with doping, as well as the change in the conductivity of an organic semiconductor upon the doping ratio. The model demonstrates that the exponent of an empirical power law for the conductivity is actually temperature-dependent. Calculation results coincide well with experimental observations.
REFERENCES
1.
J. H.
Burroughes
, D. D.C.
Bradley
, A. R.
Brown
, R. N.
Marks
, K.
Mackay
, R. H.
Friend
, P. L.
Burns
, and A. B.
Holmes
, Nature
347
, 539
(1990
).2.
E.
Conwell
, Phys. Rev.
103
, 51
(1956
).3.
J. R.
Sheats
, H.
Antoniadis
, and M.
Hueschen
, Science
273
, 884
(1996
).4.
J.
Blochwitz
, M.
Preiffer
, T.
Fritz
, and K.
Leo
, Appl. Phys. Lett.
73
, 729
(1998
).5.
A.
Nollau
, M.
Pfreiffer
, T.
Fritz
, and K.
Leo
, J. Appl. Phys.
87
, 4340
(2000
).6.
X.
Zhou
, M.
Pfeiffer
, J.
Blochwitz
, A.
Werner
, A.
Nollau
, T.
Fritz
, and K.
Leo
, Appl. Phys. Lett.
78
, 410
(2001
).7.
H.
Bassler
, Phys. Status Solidi B
175
, 15
(1993
).8.
9.
A. J.
Twarowski
, J. Chem. Phys.
76
, 2640
(1982
).10.
V.
Ambegaokar
, Phys. Rev. B
4
, 2612
(1971
).11.
12.
M. C. J. M.
Vissenberg
and M.
Matters
, Phys. Rev. B
57
, 12964
(1998
).13.
Y.
Shen
, K.
Diest
, M. H.
Wong
, B. R.
Hsieh
, D. H.
Dunlap
, and G. G.
Malliaras
, Phys. Rev. B
68
, 0812041
(2005
).14.
N. F.
Mott
, J. Non-Cryst. Solids
1
, 1
(1968
).15.
M.
Pope
, Annu. Rev. Phys. Chem.
35
, 613
(1984
).16.
O.
Rubel
, S. D.
Baranovskii
, and P.
Thomas
, Phys. Rev. B
69
, 014206
(2004
).17.
B. A.
Gregg
, S. G.
Chen
, and H. M.
Branz
, Appl. Phys. Lett.
84
, 1707
(2004
).18.
B.
Maennig
, M.
Pfeiffer
, A.
Nollau
, X.
Zhou
, K.
Leo
, and P.
Simon
, Phys. Rev. B
64
, 195208
(2001
).19.
C. P.
Jarrett
, R. H.
Friend
, A. R.
Brown
, and D. M.
de Leeuw
, J. Appl. Phys.
77
, 6289
(1995
).20.
D. M.
de Leeuw
, Synth. Met.
57
, 3597
(1993
).21.
G.
Ganzorig
and M.
Fujihira
, Appl. Phys. Lett.
77
, 4211
(2000
).22.
M.
Maitrot
and B.
Boudjema
, J. Appl. Phys.
60
, 2396
(1986
).23.
M.
Sahimi
, Applications of Percolation Theory
(Taylor & Francis
, London
, 1994
).24.
P. N.
Butcher
, Linear and Nonlinear Electron Transport in Solids
(Plenum
, New York
, 1976
).© 2007 American Institute of Physics.
2007
American Institute of Physics
You do not currently have access to this content.
