Photosensitive in wide spectral region composites based on polyphenylenevinylene

• Published in: Semiconductor Physics Quantum Electronics & Optoelectronics
• Date: 2009
• Main Authors: Syromyatnikov, V., Pomaz, I., Verbitsky, A., Vertsimakha, Ya., Nešpůrek, S., Pochekaylov, S.
• Format: Article
• Language: English
• Published: Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України 2009
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/118613
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Photosensitive in wide spectral region composites
 based on polyphenylenevinylene / V. Syromyatnikov, I. Pomaz, A. Verbitsky, Ya.Vertsimakha,S. Nespurek, S. Pochekaylov // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2009. — Т. 12, № 1. — С. 01-07. — Бібліогр.: 16 назв. — англ.

Optical and photovoltaic properties of polyphenylenevinylene derivative –
 poly(2-methoxy-5-(3-,7-dimethyl-octyloxy)-1,4-phenylenevinylene (MDMO-PPV) and
 its composites with high (40 %) concentration polymethine dyes (PD) – meso-Cl and
 hexaindoletricarbocyanine (HITC) films have been studied. Two H-aggregates of dyes
 with different energies that weakly depend on the molecular structure of dyes, is formed
 in MDMO-PPV with PD in composites films. The efficiency of photogeneration of
 charge carrier by these aggregates is greater than the efficiency of photogeneration of
 charge carriers by the quasi-isolated molecules of dye. It results in substantial expansion
 of the absorption region (in comparison with the absorption region of molecules in
 solution) and photosensitivity in the side of higher energies. The presence of PD
 aggregates in the films MDMO-PPV influences on their photosensitivity that depends on
 PD molecular structure. This dependence can be caused by interaction between the
 molecules of MDMO-PPV and dye. In composites MDMO-PPV/HITC, the value of
 interaction is low and practically does not influence the efficiency of photogeneration of
 charge carriers by MDMO-PPV molecules, which give a considerable contribution to
 formation of the photovoltage in 2-3 eV regions. The interaction of meso-Cl and
 MDMO-PPV molecules is stronger, and this, probably, results in considerable decrease
 of photovoltage in the region of the excitation of MDMO-PPV.