Dresden 2009 – wissenschaftliches Programm

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.39: Poster

Donnerstag, 26. März 2009, 16:30–19:00, P1A

The effect of side chain substitution on the charge transfer properties of a low band-gap donor acceptor copolymer — •Philipp Oberhumer¹, Guoli Tu², Sylvain Massip¹, Sebastian Albert-Seifried¹, Justin Hodgkiss¹, Wilhelm Huck², and Richard Friend¹ — ¹Cavendish Laboratory, Cambridge, UK — ²Melville Laboratory for Polymer Synthesis, Cambridge, UK

The effect of side chains on the photophysics of a series of low band-gap charge-transfer (CT) polymers derived from Poly[bis-N, N (4-octylphenyl)-bis-N,N-phenyl-1,4-phenylenediamine-alt-5,5' (4',7',-di-2-thienyl-2',1',3'-benzothiadiazole] T8TBT is presented. The CT nature of excitations is revealed by solvatochromic emission and long lived CT states observed in transient absorption experiments. The polymer with additional side chains shows a loss of planarity of the acceptor unit, causing a pronounced blue-shift and weakening of the CT absorption band. It also features blue-shifted emission and longer photoluminescence lifetimes. Furthermore performance in PCBM blended solar cells drops significantly.