Efficient charge carrier transfer from m-LPPP to C60 derivatives

The improvement of dissociation of singlet excitons by electron or hole capturing species like C-60 is essential for efficient photovoltaic cells based on conjugated systems. We investigate the charge transfer in blends of methyl-substituted ladder type poly-(paraphenylene) (m-LPPP) with new well soluble C-60 derivatives, which are characterized by sidegroups of different electronic properties (donor, acceptor nature). It is shown, that the electronic properties of the C-60 sidegroups strongly influence the efficiency of the charge transfer in these blends and hence significant different behaviours in the photocurrent and photoinduced absorption is observed. (C) 1998 Elsevier Science B.V.