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Oligothiophene cruciform with a germanium spiro center : a promising material for organic photovoltaics

Wright, Iain A. and Kanibolotsky, Alexander L. and Cameron, Joseph and Tuttle, Tell and Skabara, Peter J. and Coles, Simon J. and Howells, Calvyn T. and Thomson, Stuart A. J. and Gambino, Salvatore and Samuel, Ifor D. W. and Skabara, Peter (2012) Oligothiophene cruciform with a germanium spiro center : a promising material for organic photovoltaics. Agewandte Chemie-International Edition, 51 (19). pp. 4562-4567. ISSN 1433-7851

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Abstract

A fascinating packing motif is observed in a novel cruciform oligothiophene containing a Ge (violet; see picture) spiro center. Long-range interchain interactions between molecules and strong electronic coherence between orthogonal chains within the molecules are present. Such ordering is advantageous for bulk charge transport, as demonstrated by high short-circuit currents in bulk heterojunction organic solar cells.