The influence of matrix material on the spectral dependence of the photosensitivity of polymer nanocomposites

ABSTRACT

The influence of matrix material on optical and photovoltaic properties of nanocomposite dyes-containing films is analyzed. The H-aggregates of the polymethine dyes with different energies are formed in the films. The efficiency of charge-carrier photogeneration of some H-aggregates is higher than that of quasi-isolated dyes molecules. This results in an essential widening of the spectral region absorption and the photosensitivity to the region 1.6-2.0 eV. The energy maxima for H-aggregates weakly depend on the matrix molecular structure, whereas their photosensitivity maxima mainly depend on the dyes molecular structure. The effective charge carrier photogeneration and the photovoltage in these films in the region 2.0–3.0 eV are verified.

KEYWORDS:

• polymer composites
• polymethine dyes
• photosensitivity
• H-aggregates