Synthesis and Photovoltaic Performance of Pyrazinoquinoxaline
Containing Conjugated Thiophene-Based Dendrimers and Polymers
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Abstract
Pyrazinoquinoxaline-based
building blocks were incorporated into
both π-conjugated dendrimers and polymers. The dendrimers were
synthesized using a convergent/divergent approach whereas the donor/acceptor
copolymers were synthesized via Stille cross-coupling reactions. The
structurally defined dendrimers and the π-conjugated polymers
were investigated with respect to their optical and electronic properties
as well as their performance in photovoltaic devices. Because of the
presence of the electron-deficient pyrazinoquinoxaline moiety, the
absorption spectra of the materials under investigation were red-shifted
with respect to the all thiophene-containing materials. Power conversion
efficiencies up to 1.7 and 0.8% were obtained from blends of second-generation
dendrimers and polymers with PC<sub>71</sub>BM, respectively