Semiconducting copolymers comprising benzodithiophene and benzotriazole derivatives for organic photovoltaic cells

摘要: Abstract Semiconducting polymers of benzodithiophene and benzotriazole derivatives were synthesized for organic photovoltaic cells (OPVs). 4,7-Dibromo-2-(heptadecan-9-yl)-2H-benzo[d][1,2,3]triazole (BTz) was used as the acceptor monomer, whereas either 2,6-bis(trimethyltin)-benzo[1,2- b :4,5- ′]dithiophene (BDT) or 2,6-bis(trimethyltin)-4,8-bis(triisopropylsilylethynyl)-benzo[1,2- (TIPSBDT) donor monomer to give poly{benzo[1,2-b:4,5-b′]dithiophene- alt -2-(heptadecan-9-yl)-2H-benzo[d][1,2,3]triazole} (PBDT-BTz) poly{4,8-bis(triisopropylsilylethynyl)benzo[1,2-b:4,5-b′]dithiophene- (PTIPSBDT-BTz), respectively. The characterized by thermogravimetric analysis (TGA), UV–vis absorption, electrochemical cyclic voltammetry, X-ray diffraction analysis, hole mobility in thin film transistor (OTFTs), measurements. Bulk hetero junction devices fabricated using with [6,6]-phenyl C 71 -butylic acid methyl ester (PC BM) electron acceptor. Devices PTIPSBDT-BTz showed maximum power conversion efficiency (PCE) 4.16% an open-circuit voltage 0.86 V, a short-circuit current 10.48 mA/cm 2 , fill factor 0.46, measured under air mass (AM) 1.5 global (1.5 G) illumination conditions (100 mW/cm ).