Gate-voltage control of optically-induced charges and memory effects in polymer field-effect transistors

Memory operations in polymer phototransistors have been demonstrated. A fraction of light- induced drain current in the depletion mode of a polythiophene- based field- effect transistor persists after switching off the photoexcitation, and can be erased by reversing the gate voltage (Vg). Write, store, read, and erase operations can be performed by applying a combination of gate voltages and incident light over a wide temperature range