Ambipolar organic phototransistors with bulk heterojunction films of p-type and n-type conjugated polymers
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Various conjugated polymers have been synthesized and applied for organic electronic devices such as organic field-effect transistors, organic phototransistors, etc. A particular attention has recently been paid to organic phototransistors with conjugated polymers as an active layer because organic phototransistors have great potential for next-generation optical sensors, which require high flexibility and wearable capability, over conventional inorganic phototransistors. Most approaches in organic phototransistors have been so far limited to single channel device structures, even though both p-channel and n-channel operation can be another benefit for easy integration of optical sensors in systems. In this presentation, we demonstrate ambipolar organic phototransistors of which active layers consist of bulk heterojunction films. The sensing performances of ambipolar organic phototransistors will be discussed in detail according to fabrication conditions etc.