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Effects of orientation at the phthalocyanine-CdSe interface on the electron transfer characteristics

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Details

Original languageEnglish
Pages (from-to)10511-10517
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume19
Issue number16
DOIs
Publication statusPublished - 2017
Publication typeA1 Journal article-refereed

Abstract

A phthalocyanine molecule adsorbed on the (1010) surface of wurtzite CdSe is theoretically modeled by the DFT method. We have found that a linker does not affect substantially the redox properties of phthalocyanine, while saturation of the macrocycle with peripheral substituent groups causes a downward shift in the energy position of its frontier orbitals that can hinder electron injection to the CdSe surface. Tilting of the phthalocyanine molecule relative to the surface also leads to the lowering of its molecular electronic levels relative to the bands of CdSe. At a tilting angle of 30°, the LUMO level of the dye appears to be lower than the conduction band minimum of cadmium selenide, which makes the electron transfer to its hybridized surface unfavorable. By contrast, the HOMO level of the phenylbutyric acid linker provides a suitable intermediate channel for the hole transfer from the valence band of CdSe to the phthalocyanine that points to the possible acceptor behavior of the phthalocyanine molecule in its hybrids with CdSe nanostructures.

Publication forum classification

Field of science, Statistics Finland