Synthesis and characterization of conjugated copolymer containing 2,5-bis(3-decylthiophen-2-yl)thiazolo[5,4-d]thiazole and 2,6-[(1,5-didecyloxy)naphthalene for polymer solar cells

Publication year: 2011
Source: Synthetic Metals, In Press, Corrected Proof, Available online 14 June 2011

Pranabesh, Dutta , Wooseung, Yang , Hanok, Park , Myung-jin, Baek , Youn-Sik, Lee , …

A new alternating donor–acceptor conjugated copolymer, poly{(2,5-bis(3-decylthiophen-2-yl)thiazolo[5,4-d]thiazole-5,5′-diyl)-alt-(2,6-[(1,5-didecyloxy)naphthalene])} (PNTzTz) based on thiazolothiazole and didecyloxynaphthalene units was synthesized using a typical Suzuki coupling polymerization method and was explored as a donor polymer in bulk heterojunction (BHJ) solar cells. The copolymer was characterized using differential scanning calorimetry, thermogravimetric analysis, UV–Vis absorption and cyclic voltammetry. It possesses moderate molecular weights and excellent thermal properties with a 5% weight loss around 340°C. It also exhibits good optical absorption with an absorption peak at 475nm and an absorption onset at 560nm in the film state. Photovoltaic properties of the copolymer were investigated blended with electron acceptor,…

 Highlights: ► Conjugated copolymer based on thiazolothiazole and didecyloxynaphthalene units was synthesized. ► Photovoltaic properties of the copolymer were investigated blended with electron acceptor, PC61BM. ► The optimized photovoltaic device shows a power conversion efficiency up to 0.99%.