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Figure 1

Organic semiconductors can be divided into two types, short chain (oligomers)

and long chain (polymers).5Typical examples for semiconducting oligomers are

pentacene, anthracene and rubrene. Some semiconducting polymers are Poly(3-

hexylthiophene) and poly(p-phenylene vinylene).

Short chain organic semiconductors are usually formed by a series of benzene

rings in which the π -bonds become delocalized to form a π -system. The gap between

occupied and empty states in these π systems becomes smaller with increasing

delocalization, leading to smaller bandgap (Figure 2).

Figure 2

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