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Home Chemistry Polymethine-Dye-Based Molecular Photosemiconductors for Data-Recording Media, Photovoltaic, and Optoelectronic Devices

Polymethine-Dye-Based Molecular Photosemiconductors for Data-Recording Media, Photovoltaic, and Optoelectronic Devices

Description

Polymethine dyes (PDs) are unique centres of photogeneration and emission recombination of charge carriers in photoconducting polymer matrices. Depending on the donor-acceptor properties (ionization potential and electron affinity) of the PD and the polymer, these centres provide intermolecular electron transfer from the former to the latter or vice versa. As a result, cation and anion radicals are formed which are bound into electron-hole pairs by the electrostatic attraction forces of opposite charges. In an external electric field, the pairs dissociate due to field-induced electron transitions which give rise to directed electron transport, i.e., photocurrent, in a coloured medium. PDs of various ionic states afford the hole (p), electron (n), and mixed-type photo-conductivity. Purposefully selected PDs and polymers provide an appropriate conductivity type to obtain a photovoltaic effect in solar batteries, polymer surface- charge modulation and surface-relief deformation in photothermoplastic holographic media used for optical data recording as well as charge carrier capture by PD molecules causing their excitation to a luminescent state in electroluminescent devices.


Innovative Aspect and Main Advantages

Polymer photosemiconductors, as compared to their inorganic counterparts with the same output technical parameters, are distinguished by lower energy inputs, smaller dimensions, reduced costs, and the possibility of preparing thin-film flexible nanocomposites. PD composites have advantages over individual photoconducting polymers in that they operate throughout the visible and near IR spectral region, and also exhibit the maximum absorption selectivity and light energy conversion efficiency. These properties are helpful in the design of holographic data-recording media with high-level information characteristics which require no protection from outside light during latent image formation, electroluminescent diodes with a narrow emission band, and photovoltaic solar energy converters with high sensitivity at the maximum of the solar emission spectrum.

Areas of Application

Solar power engineering, optical data recording and imaging, optoelectronics.


The interferogram of a site
on an aluminium plate
after boring a hole (with 1mm
diameter and 0.5mm
depth). The hologram was
recorded on polymethine
dye doped polymer.


The interferogram of a site
on an aluminium plate
after boring a hole (with 1mm
diameter and 0.5mm
depth). 3D-processing was
made.


Spectral dependences of photosensitivity of Cyanine Green
composite sample and recent developed layers for plastic
solar cells PCBM+PTPTB and CIS+PCPM

Stage of Development

Methods to synthesize organic dyes have been developed at the Institute of Organic Chemistry NAS of Ukraine. The scientists of Taras Shevchenko Kiev National University have elaborated the procedure for preparing PD-based photoconducting polymer media.

Contact Details

Institute of Organic Chemistry National Academy of Sciences of Ukraine
Contact person: Alexander Ishchenko
Address: 5, Murmanskaya str., 02660, Kiev-94, Ukraine
Tel.: (+38 044) 499 46 04
Fax: (+38 044) 573 2643
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Taras Shevchenko Kiev National University
Contact person: Nikolay Davidenko
Address: 64, Volodymyrska str., 01033, Kyiv, Ukraine
Tel.: (+38 044) 239 3390
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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