REFLECTIVITY OF CADMIUM-SULFIDE NANOCRYSTAL FILMS GROWN BY THE LANGMUIR-BLODGETT TECHNIQUE

Reflectivity studies have been done on nanocrystalline hexagonal CdS p articulate films grown by the Langmuir-Blodgett (LB) technique under a floating monolayer of arachidic acid. The band-edge peak (Eo) in the reflectivity spectra has been found to be blue-shifted with respect to that for bulk CdS. The appearance of the E-1(A) peak at about 5 eV is evidence for the hexagonal nature of the particles with the c axis no rmal or nearly normal to the plane of the film. This suggests the epit axial nature of the grown particulate films. Another reflectivity peak has been observed at about 320 nm. However, its origin is not yet cle ar.