Bistriphenylamine- and benzodithiophene- based random conjugated polymers in ternary blend bulk heterojunction organic solar cells

Toppare, Levent Kamil
Alemdar, Eda
Cevher, Şevki Can
Hizalan, Gonul
Hacıoğlu, Şerife
Çırpan, Ali
Concept of Ternary organic solar cell is one of the most promising topics in photovoltaic studies. However, because of the complicated phase separation systems, improving the power conversion efficiency is quite compelling. In this study, a ternary organic solar cell with two donors Poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][3- fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7) and benzodithiophenebased random conjugated polymers (P1 and P2) and one fullerene based acceptor (PC71BM) are used to form the active layer. Two donors are complementary with each other in the UVVIS spectra, in other words, λmax values of PTB7 and P1 were determined as 760 nm and 481 nm, respectively. Photovoltaic performance of the polymers P1 and P2 were examined under the illumination of AM 1.5G, 100 Photovoltaic studies showed that the highest power conversion efficiency of these photovoltaic devices were recorded as 3.50% with open circuit voltage; 0.79 V, short circuit current; 9.45, fill factor; 0.53.