Optical and photovoltaic properties of thin films of N,N′-dimethyl-3,4,9,10-perylenetetracarboxylic acid diimide

Shift of absorption energy during thin dye film growth: interpretation by geometric models of the growth morphology

“…The peaks at 2.31 eV and 2.49 eV as well as the shoulder at about 2.70 eV belong to vibrational satellites of the S 0 ➜ S 1 transition, and the peak at 2.88 eV corresponds to the S 0 ➜ S 2 transition. The strong π-π interaction between the unchlorinated dye molecules in the crystalline MePTCDI film leads to the formation of charge transfer states, which are visible in the spectra as broad band at~2.6 eV besides the S 0 ➜ S 1 transition peak at 2.17 eV [4,[19][20][21].…”

Effect of buffer layers on performance of organic photovoltaic devices based on copper phthalocyanine-perylene dye heterojunction

“…The systems were produced at the same conditions and the thick− nesses of active organic layers (CuPc, MePTCDI) were equal to (80 ±5) nm. We did not expect particularly effec− tive photovoltaic performance, since the exciton diffusion lengths measured in CuPc and MePTCDI lay mostly within the range of 5-30 nm [2,4,9,10,23], which is several times smaller than the thickness of our active layers. Figure 1(b) shows a set of energy levels of the applied materials.…”

Polyaniline – Organic Semiconductor Heterostructures

“…The thickness of polyaniline films was controlled by their optical density at k ¼ 750 nm and measured by an interference microscope MII-4. The polyaniline=organic semiconductor heterostructures were prepared by thermal deposition of N,N 0 -dimethyl-3,4,9,10-perylenetetracarboxylic acid diimide {or methyl substituted perylene pigment} (MPP) [9] or pentacene (Pn) [10,11] on a polyaniline layer at 370 K. The thickness of MPP and Pn was controlled by the frequency change of a quartz resonator and after, the deposition, by the optical density spectra and with an atomic force microscope (AFM) ''NanoScope IIIa''. The topology of the film surface was studied, by using AFM images.…”