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Organic semiconductors can be prepared as molecular single crystals by vacuum

evaporation. This brings closer the coupling of the π systems and increases the band

transport mobility.

Long chain organic semiconductors are usually polymers that have π bonds that

are delocalized along the chain to form a one-dimensional system resulting in a 1D-band

structure that has considerable band width. The transport properties of such polymers are

usually determined by defects in the 1D-chains or by hopping from chain to chain.

Polymer organic semiconductors are usually deposited in wet processes, like spin coating

or doctor blading.

Figure 3

Delocalization in polymer semiconductor is accomplished by forming a conjugated

backbone of continuous overlapping orbitals. This includes alternating single and double

carbon-carbon bonds, which leaves a continuous path of overlapping p orbitals (figure 4).

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