Charge separation in a nonfluorescent donor-acceptor dyad derived from boron dipyrromethene dye, leading to photocurrent generation

Shigeki Hattori, Kei Ohkubo, Yasuteru Urano, Hisato Sunahara, Tetsuo Nagano, Yuji Wada, Nikolai V. Tkachenko, Helge Lemmetyinen, Shunichi Fukuzumi

Research output: Contribution to journalArticlepeer-review

216 Scopus citations

Abstract

Boron dipyrromethene (BODIPY), which is commonly used as an energy absorbing and transferring antenna molecule, has been modified to contain an electron donor moiety, 8-(2,4,5-trimethoxyphenyl)-4,4-difluoro-1,3,5,7- tetramethy1-4-bora-3a,4a-diaza-s-indacene (MEOPHBDP). The photoinduced electron transfer from a 2,4,5-trimethoxyphenyl moiety to a BODIPY moiety of MEOPHBDP in acetonitrile was observed by femtosecond laser flash photolysis measurements. The lifetime of the charge-separated state of MEOPHBDP was 59 ps at 298 K. The dye-sensitized solar cells (DSSC) were prepared using MEOPHBDP with carboxylic acid (MEOPHBDP-COOH) and a reference BODIPY dye having no electron donor moiety. The photovoltaic measurements were performed using a standard two-electrode system consisting of a working electrode and a Pt sputtered electrode in methoxyacetonitrile containing 0.5 M iodide and 0.05 M I2. The photoelectrochemical properties of DSSC with MEOPHBDP are compared with those with a reference BODIPY dye.

Original languageEnglish
Pages (from-to)15368-15375
Number of pages8
JournalJournal of Physical Chemistry B
Volume109
Issue number32
DOIs
StatePublished - 18 Aug 2005

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