Substitution of phthalocyanines affecting the properties of their films and heterostructures

Y. Vertsimakha, S. Mamykin, P. Lutsyk

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Optical and photovoltaic properties were studied for phthalocyanine derivatives: sulfonamide zinc phthalocyanine (ZPS), amine zinc phthalocyanine (ZPN) and amine metal-free phthalocyanine (HPN) thin films and thin-film heterostructures made of the phthalocyanine derivatives with organic semiconductors – N,N′-dimethylperylene-tetracarboxylicacid diimide, pentacene, lead phthalocyanine. It was shown that sulphonamide substitution of phthalocyanine molecule practically does not affect the absorption spectra. NH2 substitution results in appearance of additional absorbance in long-wave range in comparison to the spectra of ZPS. The behavior can be explained by an increase of molecular aggregation due to more efficient interaction of NH2 substituted phthalocyanines. The photovoltaic sensitivity of the phthalocyanine films decreases in following sequence ZPS → ZPN → HPN.

Thermal deposition of N,N′-dimethylperylene-tetracarboxylicacid diimide and pentacene on thin films of the phthalocyanine derivatives results in formation of sufficiently high potential barrier at the interface. The highest photosensitivity was observed in the heterostructures with pentacene films.
Original languageEnglish
Pages (from-to)16-21
JournalChemical Physics
Publication statusPublished - 24 Aug 2012


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