Low band gap thiophene-perylene diimide systems with tunable charge transport properties

Ganapathy Balaji, Tejaswini S. Kale, Ashok Keerthi, Andrea M. Della Pelle, S. Thayumanavan, Suresh Valiyaveettil

Research output: Contribution to journalArticlepeer-review

Abstract

Perylenediimide-pentathiophene systems with varied architecture of thiophene units were synthesized. The photophysical, electrochemical, and charge transport behavior of the synthesized compounds were studied. Both molecules showed a low band gap of ∼1.4 eV. Surprisingly, the molecule with pentathiophene attached via β-position to the PDI unit upon annealing showed a predominant hole mobility of 1 × 10-4 cm2 V-1 s-1 whereas the compound with branched pentathiophene attached via β-position showed an electron mobility of 9.8 × 10 -7 cm2 V-1 s-1. This suggests that charge transport properties can be tuned by simply varying the architecture of pentathiophene units.

Original languageEnglish
Pages (from-to)18-21
Number of pages4
JournalOrganic Letters
Volume13
Issue number1
DOIs
Publication statusPublished - 7 Jan 2011

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