FABRICATION TECHNIQUE AND OPTICAL PROPERTIES OF CARBON-BASED SUPERLATTICE STRUCTURES

摘要

C_(60) / amorphous carbon superlattice structures were fabricated by shutter controlled high-vacuum evaporator. Three kinds of films were deposited with different shutter sequences. Designed thickness is [(a-C(4.0 nm)/C_(60)(4.0 nm)) x45 periods], [(a-C(2.8 nm)/C_(60)(2.8 nm)) x45 periods], and [(a-C(0.6 nm)/C_(60)(3.4 nm)) x45 periods], respectively. The periodic structure of resulted films was confirmed by X-ray diffraction (XRD) measurements. From the uv-visible reflectance/transmittance measurements, the blue shift of absorption edge was observed in the #3 superlattice sample [(a-C(0.6 nm)/C_(60)(3.4 nm)) x45 periods], comparing with the #1 superlattice sample [(a-C(4.0 nm)/C_(60)(4.0 nm)) x45 periods]. This result suggests that the effective band gap energy could be controlled by the thickness of each layer of superlattice structure.