SCANNING NEAR-FIELD OPTICAL ATOMIC FORCE MICROSCOPY STUDIES ON THE SURFACE MORPHOLOGY AND OPTICAL STRUCTURES OF MEROCYANINE DYES

摘要

Merocyanine dyes, originally developed as photosensitizers for silver halide photography, have renewed interest as a class of organic photoconductor, which may be useful for high efficiency photovoltalic device. Various contributions on the optical and photoelectric characteristics of merocyanine thin films have been investigated extensively in systems fabricated using vacuum evaporations, casting or Langmuir-Blodgett (LB) films. On the studies of photoconductivity, the formation of J-aggregates is one of the important subjects for molecular arrangement of dye because the existence of J-aggregation can improve the optical applications, and variously reported. Even though, various reports were faced on the optical properties of merocyanines, there were no reports on the optical structures of these dyes.