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Another example of fabrication affecting carrier mobility is growing amorphous films of

pentacene which is achieved by keeping the substrate temperature low during deposition.

This makes an insulating film. However, when the substrate temperature is kept at room

temperature during deposition, a very well-ordered film is deposited with a high

mobility.3 Figure 5 demonstrates that ordered organic material has higher charge

transport mobility.

Organic semiconductors have found applications in solar cells because it has the

potential for low cost manufacturing. Solar cell incorporating organic semiconductor can

be made by depositing patterned electrode and semiconductors on plastic substrate using

roll-to-roll coating machines. This would produce cheaper solar cells, but also allow solar

cells to be easily installed on roof, clothes, and electronic devices. However, the

efficiency of organic solar cell is still very low compare to solar cells made using

traditional silicon technology. Another application of organic semiconductor is in

organic thin film transistor (OTFT). Organic transistors (Figure 6) are transistors that use

organic molecules rather than silicon for their active material. This active material can be

composed of a wide variety of molecules. The advantage of organic transistor is that they

are compatibility with plastic substratess, have lower manufacturing temperature, lower

fabrication cost (spin-coating, printing, evaporation), and no need to worry about

dangling bonds.6

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