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Figure 6

Organic TFT differ from silicon TFT in that it only operates in accumulation mode. This

makes complementary logic more difficult to implement, although there are several

solutions to this problem. One technique to overcome this shortfall involves using layers

in organic semiconductors to make heterostructures which allow p and n channels.7 The

disadvantage of OTFT so far is their lower mobility and switching speeds compared to

silicon and that they usually do not operate under inversion mode.7 For organics to

compete with amorphous silicon, their mobility should be greater than 0.1 cm²/V S.

Conclusion:

Organic semiconductors are relatively new class of materials that offer the ability

to create devices using plastic substrate. Organic semiconductors work because of

π conjugated bond within its molecules. Without conjugation, electrons are shared very

closely between molecules creating a large band gap compared to molecules with

conjugation, thus making it an insulator. The conducting mechanism of organic

semiconductor is charge hopping which allows electron to jump from one molecule to

another. Phonons assists charge hopping, therefore increasing temperature also increases

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