Polymer Electronics

December 31, 2012 12:28 PSP Book - 9in x 6in 01-Hsin-Fei-Meng-c01

6 Overview of Semiconducting Conjugated Polymers

Figure 1.5 Chemical structures of MEH-PPV, PFO, and P3HT. The IP and EA

values are also given in eV.

coefficients of two adjacent carbon atoms are more in phase in the

linear combination. In the conduction band the coefficients are more

out of phase. The valence band is therefore indicated as π-band

while the conduction band is indicated as π *-band. Similar to the

bonding and anti-bonding orbitals of polyethylene, the energy gap

is indicated as π–π * gap. The concept of π -bands of polyacetylene

can be easily generalized to other conjugated ...