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Carbazole-based small molecule electron donors: Syntheses, characterization, and material properties

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Details

Original languageEnglish
Article numberj.dyepig.2017.11.014
Pages (from-to)79-88
Number of pages10
JournalDyes and Pigments
Volume150
Early online date8 Nov 2017
DOIs
Publication statusPublished - 8 Nov 2017
Publication typeA1 Journal article-refereed

Abstract

Efficient synthetic methods for carbazole-based small molecule electron donors with donor–acceptor (D–A) and A–D–A type structures were developed. In order to study the relation between chemical structures and material properties, the prepared compounds were characterized in detail using absorption spectroscopy, differential pulse voltammetry, and computational methods. In addition, symmetrical A–D–A type compounds were tested as an active layer component in bulk heterojunction based organic solar cell (OSC) devices with conventional structure. The results show that the two compound types have many similar properties. However, the extended molecular structure of A–D–A type compounds offer better film forming properties and higher molar absorption coefficients compared with the D–A type materials. Furthermore, the attachment of fluoro substituents in the A units has a positive effect on all solar cell device parameters. Moreover, the computational studies revealed that the molecular structures are twisted between the central carbazole D unit and π-bridge which may result in inefficient intramolecular charge transfer and, also, relatively limited short-circuit currents in OSC devices.

ASJC Scopus subject areas

Keywords

  • Absorption, DFT, Electron donor, Organic solar cell, Suzuki-Miyaura, Synthesis

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