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Influence of donor-acceptor layer sequence on photoresponsive organic field-effect transistors based on palladium phthalocyanine and C60
19. N. Takahashi, A. Maeda, K. Uno, E. Shikoh, Y. Yamamoto, H. Hori, Y. Kubozono, and A. Fujiwara, Appl. Phys. Lett. 90(8 ), 083503 (2007).
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Photoresponsive organic field-effect transistors (PhotOFETs) based on palladium phthalocyanine (PdPc) and C60 were fabricated with different donor-acceptor layer sequences. Both planar heterojunction devices fabricated exhibit better performance under illumination than the single PdPc device. PhotOFETs with the structure SiO2/C60/PdPc/Au exhibit a higher photosensitivity and photoresponsivity than that with the structure SiO2/PdPc/C60/Au. The origin for this is largely the high mobility of C60 and the well-matched LUMO levels of PdPc and C60. The maximum photosensitivity of the SiO2/C60/PdPc/Au device is 8 × 103, and the photoresponsivity is approximately 28 times that of the single component PdPc device.
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