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Fabrication and I-V Characterization with Monochromatic Light of Multilayer Poly(3-hexylthiophene)-CNT/C60 Thin Films on ITO Glass Substrate

Multilayer poly (3-hexylthiophene)-CNT/C60 thin films on ITO glass substrate was fabricated regarding to the function of each layer. Poly (3-hexylthiophene) (P3HT) is used as a donor layer and fullerene (C60) is used as an acceptor layer of the device. The carbon-nanotube (CNT) is homogeneously mixed in the donor layer to increase charge transportability. The structures of poly (3-hexylthiophene), poly (3-hexylthiophene)-CNT were fabricated in comparison of poly (3-hexylthiophene)-CNT/C60 thin films. The P3HT-CNT bulk heterojunction was deposited on ITO glass substrate by spin coating technique and then the C60 thin film was deposited on the P3HT by thermal evaporating technique. The I-V characteristic of ITO/P3HT-CNT/Al and ITO/P3HT-CNT/C60/Al were investigated in the monochromatic light. The result showed that the ITO/P3HT-CNT/Al structures respond with red and green light, and the ITO/P3HT-CNT/C60/Al structure responds with blue light. The UV absorption was measured and the result was consistence with the I-V characterization.