Study On The PhotOFET Based On Lead Phthalocyanine

Photoresponsive organic field-effect transistors (PhotOFETs) have higher gain, higher sensitivity, lower noise, and suitable for flexibility production of large area, so it has a broad prospects of development. Lead phthalocyanine is a hole-transporting organic semiconductor material, as it has excellent photosensitivity, so it can function as the active layer of organic solar cells.This thesis is based on the structure of the bottom-gate top-contact OFET, we have fabricated the single layer lead phthalocyanine (PbPc) OFET. This thesis is mainly to do the work as follows:(1) We discussed the effects of electrode on the performance of the device, the results show that OFET based on PbPc with Au as electrodes has larger photosensitivity, higher saturation current; taking into account the Al as the electrodes of OFET, there is a larger optical current/dark current ratio, photosensitive strongly.(2) We made an analysis of the relationship between the thickness of active layer and optical current, with the change of PbPc active layer thickness, the photocurrent increased first and then decreased.(3) We researched how the characteristics of the device change in the near infrared region under illumination. Using the red laser illumination of100mW/cm2light intensity,808nm、980nm wavelength, results show that the photosensitivity is better in the808nm wavelength of light.(4) We firstly discovered when the active layer thickness is45nm, electron mobility is close to the hole mobility in the illumination of100mW/cm2light intensity,655nm wavelength. Drain current is quite depressing in the positive and negative gate, the device exhibits the balance bipolar characteristics.