Photoinduced electron transfer in sexithiophene/fullerene derivative blends: evidence of long-lived spin correlated radical pairs

Abstract

Photoinduced electron transfer between sexithiophene and fullerene derivatives in the solid phase has been studied by transient EPR spectroscopy: spin correlated radical pairs were observed having a lifetime of 10 mu s and mean distance of 20 Angstrom

Thermal Characterization of Sexithiophenes Regioselectively Functionalized with Electron Donor Methylsulfanyl Groups

“…[1] This result is relevant to the problem of designing and synthesizing materials for artificial photosynthetic models and photovoltaic devices. [2] In particular, there is great current interest on blends of oligo-and polythiophenes with fullerene and fullerene derivatives as model systems for photovoltaic devices.…”

“…However, the occurrence of the charge transfer phenomenon seems to be related to the regiochemistry of substitution of these compounds. [7] Thus, while photoinduced generation of radical pairs was observed in blends of sexithiophene 1 (see Scheme 1) and fullerene derivatives, [1] attempts to obtain similar results with the regioisomeric sexithiophene 2 were unsuccessful. [7] A possible explanation is that the substitution pattern affects the ability of the donor sexithiophene to form intimately mixed blends with fullerenes.…”

Organometallic Ferrocene- and Phosphorus-Containing Polymers: Synthesis and Characterization

“…C 60 has been synthesized by many researchers and various characteristics have been studies. One of the most important characters is photophysical studies of systems in which C 60 behaves as an energy/electron acceptor in the ground or excited state [168] either in covalently linked dyads [169] or as heterogeneous blends [170,171] for the fabrication of photovoltaic devices [172,173]. Furthermore, C 60 was used to construct a single-layer organic LED [174].…”

Organofullerene Materials

“…Studies dealing with the incorporation of p-conjugated oligomeric units in fullerene dyad systems have increased, especially after the observation of electron transfer from conducting oligomers (or polymers) to C 60 [145,174]. Some further examples on such materials involved the construction of organofullerene materials in which two oligo-phenylenevinylene [175] or two oligo-thienylenevinylene [176] units, respectively, have been attached on the skeleton of C 60 via a fused pyrrolidine ring.…”