Title of article :
Highly π-extended polymers based on phenanthro-pyrazine: Synthesis, characterization, theoretical calculation and photovoltaic properties
Author/Authors :
Wang، نويسنده , , Zhiming and Gao، نويسنده , , Zhao and Feng، نويسنده , , Ying and Liu، نويسنده , , Yulong and Yang، نويسنده , , Bing and Liu، نويسنده , , Dandan and Lv، نويسنده , , Ying and Lu، نويسنده , , Ping and Ma، نويسنده , , Yuguang، نويسنده ,
Abstract :
Two novel narrow bandgap conjugated polymers containing phenanthro-pyrazine unit have been successfully synthesized by the Stille coupling reaction. Comparing to the common polymers containing dithiophen-quinoxaline or dithiophen-thieno[3,4-b]pyrazine moiety, the conjugation degree of these new polymers is extended through the direction perpendicular to the main chain by introducing phenanthrene-9,10-dione to maintain a rigid conjugated bridge. The obtained polymers exhibit solution-processing ability, high thermal stabilities, broad visible absorption bands and narrow optical bandgaps. Theoretical studies disclose that the P2 exhibits wholly coplanar conformation in 1-D and 2-D direction, and the PCE value is 6-folded higher than P1 under the same photovoltaic measurement condition.
