Negative photoconductivity of ferrocenyl-containing oligomer films with a merocyanine dye

Photoelectric Properties of Photoconducting Composites Based on Non-Photoconducting Polymers Doped by Triarylmethane and Xanthene Dyes

“…Such kinetical character of j growth and relaxation occurs in all applied to investigated PCFs samples electric voltage range (in our experiments U = 5-120 V) and the value of j is practically independent of the polarity U. It is suggested that observed anomalous negative photoconductivity effect can be caused by the captured on deep traps (for example, on dyes associates species) photogenerated space charge effect on the charge carriers transport and their mobility [9,13,[21][22][23][24][25].…”

“…But in the PCFs doped with a low concentration of dyes this effect is not significant and its increases with the dye concentration in the PCFs increasing (for both investigated dyes). The decrease in j and tanδ, and C in the course of prolonged irradiation indicates the formation of a significant sedentary space charge in PCF due to the capture of nonequilibrium carriers onto deep traps [13,[21][22][23][25][26][27][28]. After switching off light, these traps become free and the values of j d , C and tanδ are restored.…”

“…The techniques for measuring optical density (D) (in the samples with free surface) in the wavelength range 400-900 nm, dark (j d ) and photocurrent density (j) were described in our previous work [2,12,13]. An incandescent lamp with glass light filters was used as a light source to study the photoconduction properties of the PCFs.…”

Photoelectric properties of the photoconducting film composites based on ferrocenyl‐ and carbazolyl‐containing oligomer doped with polymethine dye

“…It is determined by long‐wave optical transition in the molecules of Dye1 . Short‐wave absorption of the films of both polymeric film composites types in the range λ = 400–480 nm is attributed to optical transitions in ferrocenyl fragments (Fer) of the oligomer.…”

“…These dyes possess high extinction coefficient within wide spectral range and are able under photoexcitation either to accept or to return electron interacting with neighboring donors or acceptors . Polymeric film composites (PFC) containing ferrocene derivatives or ferrocenyl fragments can possess photosemiconducting and magnetic properties . This fact is of interest for development of new photovoltaic media as well as materials for different applications of molecular electronics and photonics.…”