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Low cost and flexible integrated circuits will enable many new applications for our daily life. Amorphous silicon (a-Si) is the current material of choice for low-cost thin film transistors (TFTs) that are widely used as switching devices in active-matrix liquid-crystal displays. Organic (molecular crystals or polymeric) semiconductors with the advantages of flexibility and compatibility with solution-based low-cost processes (e.g. spin coating and ink jet printing) and plastic substrates are major candidates.