Page 327 - Organic Electronics in Sensors and Biotechnology

304 Cha pte r Ei g h t

N N
N N

O O
NDI

F F
F F
F F
N
F N N F
N Cu N
F N N F Perylene
N
F F
F F O O O
F F
F 16 PcCu
O O
R N N R
O O
PDI O O O
PTCDA
C 10 H 21
C 12 H 25
O N O
O
OMe
S
S
S
C 60 PCBM
O N O
n
C 12 H 25
C 10 H 21
Dithienothiophene PDI

FIGURE 8.2 Commonly used n-type organic semiconductor: NDI: naphthalene
diimide; F CuPc: perfl uorocopper phthalocyanine; Perylene; PTCDA:
16
3,4,9,10-perylene-tetracarboxylic dianhydride and its derivaties; PDI: N, N'.
dimethyl 3,4,9,10-perylene tetracarboxylicdiimide; C ; and PCBM:
60
methanofullerene [6,6]-phenyl C -butyric acid methyl ester and alternating
61
dithienothiophene and perylenediimide units.
Ambipolar Semiconductors
The ambipolar charge transport in organic transistors is a highly desir-
able property because it enables the design of circuits with low-power
dissipation and good noise margin similar to complementary metal-
oxide semiconductor (CMOS) logic circuits. Thin films of pentacene