EFFICIENT CHARGE-CARRIER TRANSFER FROM M-LPPP TO C-60 DERIVATIVES

The improvement of dissociation of singlet excitons by electron or hol e 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-LP PP) 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 blen ds and hence significant different behaviours in the photocurrent and photoinduced absorption is observed. (C) 1998 Elsevier Science B.V.