側鏈含2,2’-亞甲基雙苯並噻唑之共軛高分子合成及其在太陽能電池應用研究

Abstract

A series of low-band gap of P-type conjugated polymers via Stille coupling reactions. The main chain is selected containing alkyl-substituted conjugated thiophene and fluorene, and side chain import electron- withdrawing group Dibenzo[d]thiazol 2-ylmethane（DBT）. Comparative conjugated different stability differences between the thiophene and fluorene. All polymers exhibited good solubility in common organic solvents, and have good thermal stability. A red-shift of UV-vis absorption band was observed for the polythiophene, and successfully control the HOMO energy levels within the ideal range（-5.2 ~ -5.8 eV）. Further conjugated thiophene series of polymer prepared cis and trans device structure of solar cells. In the photovoltaic properties of the open-circuit voltage（Voc）is between 0.41 ~ 0.76 V, short-circuit current （Jsc）is between 2.86 ~ 7.67 mA/cm2, fill factor（FF）is between 0.29 ~ 0.35. Wherein the conjugated polymer PTDBT/PC71BM（w/w = 1/2.5）via 100℃ annealing, the prepared solar cells having the best performance was achieved in the following: a photoelectric conversion efficiency (PCE) of 1.55%, a Voc of 0.67 V, Jsc of 7.67 mA/cm2, and a FF of 0.3 under illumination of AM 1.5, 100 mW/cm2.