Near-infrared optical response of a naphthalocyanine/few-walled carbon nanotube hybrid

A naphthalocyanine/few-walled carbon nanotube (NaPc/FWCNT) hybrid was synthesized by packing NaPc crystalline onto the sidewall by π–π stacking. A well-dispersed NaPc/FWCNT was observed by transmission electron microscopy. Absorption spectra of NaPc/FWCNT showed a band edge at 1150 nm due to electronic interaction. A continuous poly(3-hexylthiophene):6,6-phenyl-C61-butyric acid methyl ester:NaPc/FWCNT film was observed by atomic force microscopy. Illumination of NaPc/FWCNT film using near-infrared light at 780 nm resulted in the generation of the photocurrent attributed to efficient exciton absorption and charge transfer at the interface.