Photoconductive and photovoltaic properties of new photosensitive carbazole-based oligomeric film compositions doped with dye with intramolecular charge transfer and graphene or fullerene additives
Davidenko N.A.1, Davidenko I.I.1, Studzinsky S.L.1, Kukhta A.V.2
1 Department of Macromolecular Chemistry, Kiev Taras Shevchenko National University. Prospect 64/13, Volodymyrska Street, City of Kyiv-01601,Ukraine.
E-mail: ndav@univ.kiev.ua 
2 Institute for Nuclear Problems, Belarusian State University. Babruiskaya Street 11, Minsk-220030, Belarus.
E-mail: kukhta@bsu.by; al.kukhta@gmail.com

The novel photosensitive oligomeric film compositions based on photoconductive oligomer oligo(N-glycidyl carbazole) (OGK) doped with organic dye with intramolecular charge transfer (CICT) and graphene nanoplatelets or fullerene C60 additives have been obtained. 

                            CICT		
Their electric, spectral, photoconductive and photovoltaic properties are investigated. The photoelectric properties of obtained composite films samples with a free composite surface (glass substrate – transparent electroconducting ITO (SnO2:In2O3) sublayer – composite film) have been investigated by Kelvin probe method of surface electric potential measurement. It was shown, that all investigated film composites exhibit photoconductivity and photovoltaic properties under illumination by light depending on the dopants absorption region.
The nature and features of the photoconductive and photovoltaic properties of the investigated oligomeric composition films, as well as the possible mechanisms of the photovoltaic effect are discussed. The respective phenomenological model for internal photoeffect in investigated compositions was suggested.