High photo-current in solution processed organic solar cells based on a porphyrin core A-π-D-π-A as electron donor material

摘要: Abstract Two new conjugated acceptor-donor-acceptor (A-π-D-π-A) molecules with a porphyrin core linked by ethynylene bridges to two thiophene ( 1a ) or thienylenevinylenethiophene 1b units and both capped N -ethylrhodanine have been synthesized. These compounds were used as the main electron donor moieties for bulk heterojunction small molecule organic solar cells (BHJ-SMOSC). The optimized devices, PC71BM acceptor molecule, show remarkable short circuit currents, up 13.2 mA/cm 2 , an open voltage of around 0.85 V, power conversion efficiencies 4.3% under 100 W/cm . External Quantum Efficiency (EQE), Atomic Force Microscopy (AFM), hole mobility, Photo-Induced Charge Extraction (PICE) Transient Photo-Voltage (PIT-PV) analyzed in devices based on order account differences final performance molecules. PIT-PV decays showed slower recombination kinetics fabricated Moreover, EQE was greater this is ascribed better nanomorphology, which allows charge collection before carrier takes place.