Electronic structure of fullerene-squaraine complexes for photovoltaic devices

K. Sen, R. Crespo-Otero, W. Thiel, M. Barbatti

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Squaraine dyes are promising materials to be used as electron donors in photodevices. We applied quantum chemical methods to investigate the electronic spectrum of three different squaraine dyes and of their complexes with fullerene C60 in the gas phase. Based on the excited-state densities, the electronic states were characterized as localized, delocalized and charge transfer, allowing an understanding of the basic photophysics of these compounds. Comparison with experimental data showed that the measured short-circuit voltage is correlated not only to the energy of the charge-transfer state, but also to the energy of the lowest excited state, localized at the squaraine dyes. We discuss whether this may imply a non-Marcus regime for the charge-pair dissociation at the interface.

Original languageEnglish
Pages (from-to)237-242
JournalComputational and Theoretical Chemistry
Volume1040-1041
Early online date28 Feb 2014
DOIs
Publication statusPublished - 15 Jul 2014

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