18.2 Materials
475
Fig. 18.3 Building blocks
of organic molecules,
‘R’=alkyl group, i.e. CH 3
(methyl-), CH 3 CH 2
(buthyl-), . . .
R
H
RHC
CHR
R-C
C-R
R
O -H
R
O -R
O
R
R
O
H
R
alkane
alkene
alkyne
aromatic
alcohol
ether
ketone
aldehyde
O
O-H
R
O
O-R
R
carboxylic
acid
ester
O
NHR
R
O
Cl
R
amide
acid
chloride
R
N H 2
RHC
NH
R-C
N
amine
imine
nitrile
(a)
(b)
Fig. 18.4 a Monoclinic unit cell (for size see Table 18.1) of anthracene crystal. b Two herringbone layers of pentacene
in a projection onto the bc plane of the triclinic unit cell. Adapted from [1566]
or from solution [1564, 1565]. Single organic molecular crystals exhibit intrinsic material properties.
The practical use of organic semiconductors involves thin films, e.g. in LEDs (OLED, Sect. 23.3.7)
and transistors (OFET, Sect. 24.6.4). Thin films of organic molecules are typically disordered and their
performance parameters are inferior to that of OMCs.
475
Fig. 18.3 Building blocks
of organic molecules,
‘R’=alkyl group, i.e. CH 3
(methyl-), CH 3 CH 2
(buthyl-), . . .
R
H
RHC
CHR
R-C
C-R
R
O -H
R
O -R
O
R
R
O
H
R
alkane
alkene
alkyne
aromatic
alcohol
ether
ketone
aldehyde
O
O-H
R
O
O-R
R
carboxylic
acid
ester
O
NHR
R
O
Cl
R
amide
acid
chloride
R
N H 2
RHC
NH
R-C
N
amine
imine
nitrile
(a)
(b)
Fig. 18.4 a Monoclinic unit cell (for size see Table 18.1) of anthracene crystal. b Two herringbone layers of pentacene
in a projection onto the bc plane of the triclinic unit cell. Adapted from [1566]
or from solution [1564, 1565]. Single organic molecular crystals exhibit intrinsic material properties.
The practical use of organic semiconductors involves thin films, e.g. in LEDs (OLED, Sect. 23.3.7)
and transistors (OFET, Sect. 24.6.4). Thin films of organic molecules are typically disordered and their
performance parameters are inferior to that of OMCs.