Carbon nanotubes (CNTs) have been attracting a great deal of attention recently because of their unique and advantageous properties such as a large aspect ratio, a high chemical stability, a good thermal conductivity, a high electrical conductivity, and a high mechanical strength. They are therefore considered for applications in electron field emitters for field emission displays (FEDs), quantum wires, nanoscale transistors, molecular filters, and so on. For FEDs, well vertically aligned CNTs are required to obtain a lower turn-on field and a uniform electron field emission from CNTs. CNT dispersed polymers prepared by solution processes such as electrophoresis and spin coating are suitable for polymer electronics because it is relatively easy to prepare a film. In this point of view, we have successfully obtained the low turn-on field of 1.6V/μm from the conducting polymer/CNT composite prepared by electrophoresis. On the other hand, spin-coated films of conducting polymer/CNT composites also give the excellent field emission properties under high external applied field. Thus, the use of the conducting polymer/CNT junction in the conducting polymer matrix seems to be an unique way of improving the electrical properties of the devices thin film devices. In this study, we have investigated the electrical and photovoltaic properties of CNT-dispersed Poly2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene (MEH-PPV) on an n-type TiO{sub}2 composed of ITO/TiO{sub}2/CNT-MEHPPV/Au structure in the dark condition and under illumination. And we have successfully fabricated an unique rectification device which also gives the high-efficient photo-detecting properties under reverse biased condition.
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