| 초록 |
A novel donor-acceptor alternating copolymers were designed. These polymers were consisted of difluoro-phenazine that electron-acceptor unit and Benzodithionylthiophene that electron-donor unit. These copolymers were synthesized by stille coupling reaction. Phenazine derivatives were choosed. One is liner alkyl chain (Dodecyl) and the other is two bulky alkyl chain (2-Butyl octyl, 2-decyl hexyl). Comparing with linear alkyl chain and bulky alkyl chain, the former is worse than the later. Because of it's bad solubility. So it cause low PCE of 2.73%. And then comparing with two bulky alkyl chain, 2-decyl hexyl and 2-butyl octyl, the later chain has better performance than the former because of its crystallization properties. The former is too bulky so its crystallization properties low degree and it cause low PCE of 2.76%. But 2-butyl-octyl phenazine has proper size. So it can draw out high performance of PCE of 5.28% |
