Ofets having multilayer organic semiconductor with high on/off ratio

A method comprising:

• forming a first photoalignment layer;
• illuminating the first photoalignment layer with polarized light to form a first oriented photoalignment layer;
• forming a first organic semiconductor layer directly over the first oriented photoalignment layer;
• forming a second photoalignment layer over the first organic semiconductor layer;
• illuminating the second photoalignment layer with polarized light to form a second oriented photoalignment layer;
• and
• forming a second organic semiconductor layer directly over the second oriented photoalignment layer.

An organic field effect transistor comprising:

• a first photoalignment layer disposed over a substrate;
• a first organic semiconductor layer disposed directly over the first photoalignment layer;
• a second photoalignment layer disposed over the first organic semiconductor layer;
• and
• a second organic semiconductor layer disposed directly over the second photoalignment layer, wherein a charge carrier mobility within the first organic semiconductor layer is different than a charge carrier mobility within the second organic semiconductor layer.