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Photoreactions of macrocyclic dyes on (1010) wurtzite surface – Interplay between conformation and electronic effects

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)63-71
Number of pages9
JournalUkrainian Journal of Physics
Volume64
Issue number1
DOIs
Publication statusPublished - 2019
Publication typeA1 Journal article-refereed

Abstract

Macrocyclic dyes such as phthalocyanine and porphyrin molecules are modeled on (10110) wurzite surfaces using the DFT and molecular dynamics approaches. It is found that the single dye anchored on the wurtzite surface stabilizes in an inclined geometry with its core facing the surface at a tilting angle of ca 60 . The tilting of the dye relative to the crystal surface has a dual effect on the charge transfer from a chromophore to the semiconductor. Increasing the tilting angle leads to a stronger coupling between the lowest level of the semiconductor conduction band and dye’s LUMO, thus raising the tunneling probability of the electron injection. By contrast, the electrostatic interaction between units upon the tilting of macrocycles results in a lowering of the molecule LUMO level with respect to the conduction band minimum of the wurzite crystal, which may hinder the electron transfer. The type of a linker and peripheral substituents significantly affect the mutual conformation of the moieties, and their proper choice can facilitate the photoinduced charge transfer reactions.

ASJC Scopus subject areas

Keywords

  • DFT, Electron transfer, Macrocyclic dyes, Wurzite

Publication forum classification

Field of science, Statistics Finland