| 초록 |
Polymer solar cells (PSCs) have showed great potentials such as lightweight, low cost, large-areas and flexible solar modules through roll-to-roll processing.[1] In this work, we focused on polymers which based on TTI and BTI units with different ratios as donor. The 2,2’-bithiophene-3,3’-dicarboximide (BTI) unit has two carbonyl groups with the thiophene units for the generation of electron-withdrawing ability, one nitrogen atom for the introduction of alkyl side chain to improve the solubility. 6-(2-Thienyl)-4H-thieno[3,2-b]indole(TTI) has five membered thiophene ring substituted the benzene ring of the carbazole. We synthesized conjugated random copolymers, P0, PBTI7, PBTI5 and PBTI3 containing TTI as the electron-rich unit and BTI as the electron-deficient unit. The device based on PBTI3:PC71BM showed the best performance with a PCE of 2.64%. [1] Su, Y.-W; Lan, S.-C.; Wei, K.-H. Organic photovoltaics. Mater. Today, 2012, 15, 554-562. |
