Abstract
Heterojunction photoresponsive organic field-effect transistors(PhotOFETs) based on palladium phthalocyanine(PdPc) and C60 were fabricated.PhotOFETs with the structure n+-Si/SiO2/C60/PdPc/Al(SD)(C60/PdPc-OFET) exhibit a higher photosensitivity and photoresponsivity than that with the structure n+-Si/SiO2/PdPc/C60/Al(SD)(PdPc/C60-OFET).The origin for this result is the high mobility of C60 and the well-matched LUMO levels between PdPc and C60.The maximum photosensitivity and the photoresponsivity of the C60/PdPc-OFET are 3×103 and 11 mA/W while those of PdPc/C60-OFET are 2×103 and 3 mA/W under the light source with a power density of 100 mW/cm2 and emission centered at 655 nm.
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