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We report on terrylene-3,4:11,12-bis(dicarboximide) (TDI) as electronacceptor for bulk-heterojunction solar cells using poly(3-hexyl thiophene)(P3HT) as complementary donor component. Enhanced absorption was observed inthe blend compared to pure P3HT. As shown by the very efficientphotoluminescence (PL) quenching, the generated excitons are collected at theinterface between the donor and acceptor, where they separate into chargeswhich we detect by photoinduced absorption and electron-spin resonance (ESR).Time-of-flight (TOF) photoconductivity measurements reveal a good electronmobility of 10-3 cm2 V-1 s-1 in the blend. Nevertheless, the photocurrent insolar cells was found to be surprisingly low. Supported by the external quantumefficiency (EQE) spectrum as well as morphological studies by way of X-raydiffraction and atomic force microscopy, we explain our observation by theformation of a TDI hole blocking layer at the anode interface which preventsthe efficiently generated charges to be extracted.

Detailed study of N,N'-(diisopropylphenyl)- terrylene-3,4:11,12-bis(dicarboximide) as electron acceptor for solar cells application