We studied the electrical performance of ambipolar organic transistors based on an F16CuPc/α6T pn heterojunction
illuminated by a light from a white LED. As the illumination intensity is increased up to ca. 3000 Lux, the hole mobility
decreases to about 1/3 while the electron mobility is only slightly increased. Photogeneration carriers (electrons)
enhances n-channel operating characteristics, which results a decrease in gate voltage applied to the second active layer
(or the increase in gate voltage applied in the depletion layer or the first layer), which suppresses p-channel operating
characteristics although the photogeneration carriers (holes) also enhances p-channel operating characteristics. This
result implies that the photoinduced charge transfer in the F16CuPc/α6T pn heterojunction devices is mainly dominated
by the acceptor semiconductor (F16CuPc). The drain current is significantly increased (n-channel) or decreased (p-channel)
by a light, which is used as an additional control parameter making the device interesting for sensor
applications.
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