Chemistry Reference
In-Depth Information
Table 6.1.
Values of
h
for selected organic semiconductors and
insulators as active components of OFETs
µ
e
,
µ
e
,
h
[cm
2
V
−
1
s
−
1
]
Material
Form
Reference
p-type
rubrene
15
sc
Sundar
et al.
, 2004
rubrene
1
sc
Podzorov
et al
., 2003
DTTTF
1.4
sc
Mas-Torrent
et al.
, 2004
DBTTF
1
sc
Mas-Torrent
et al.
, 2005
EDT-TTF-(CONHMe)
2
1
sc
Colin
et al.
, 2004
pentacene
1.5
tf
Lin
et al.
, 1997
pentacene
0.5
sc
Takeya
et al.
, 2003
tetracene
0.4
sc
de Boer
et al.
, 2003
tetramethyl-pentacene
0.3
tf
Meng
et al.
, 2003
TMTSF
0.2
sc
Nam
et al.
, 2003
CuPc/CoPc
0.1
tf
Zhang
et al.
, 2004
α
-6T
0.03
tf
Dodabalapur
et al.
, 1995
n-type
C
60
0.08
tf
Haddon
et al.
, 1995
F
16
CuPc
0.03
tf
Bao
et al.
, 1998
10
−
4
PTCDA
tf
Ostrick
et al.
, 1997
10
−
5
TCNQ
3
×
tf
Brown
et al.
, 1994
Note:
sc and tf stand for single crystal and thin film. The mobilities given
here correspond to the maximum reported values of the corresponding
references.
by a short pulse of strongly absorbed light of sufficiently high photon energy.
The sample is sandwiched between two electrodes (one semitransparent) in order
to apply an external voltage
V
. The carrier mobility is related to
τ
through the
L
2
3cm
2
V
−
1
s
−
1
expression
µ
/
V
τ
. Perylene (not parylene!) exhibits
µ
∼
e
,
h
e
1cm
2
V
−
1
s
−
1
, also at RT. At low temperature,
carrier mobilities increase reaching values of more than 100 cm
2
V
−
1
s
−
1
.
An important parameter, from the application point of view, in OFETs is the
on-off current ratio. For pentacene this ratio can be as high as 10
8
near
V
T
=
at RT while for biphenyl
µ
∼
e
0 (Lin
et al.
, 1997), comparable to values typically obtained for hydrogenated amorphous
silicon, making pentacene suitable for display and other low-voltage applications.
Doping-induced superconductivity?
Doping-induced superconductivity in MOMs has been demonstrated, e.g., for C
60
,
where Cs
x
Rb
y
C
60
reaches
T
c
values as high as 33 K (Tanigaki
et al.
, 1991).
