末端功能基团对聚（3-丁基噻吩）光电性能的影响

研究了4种带有不同末端基团的聚（3-丁基噻吩）（P3BT）的光电性能。 结果表明，末端基团对P3BT的结晶有一定的抑制作用，可以改变P3BT的表面能，从而有效调控P3BT∶PCBM共混体系相容性以及薄膜的形貌，并影响以P3BT为给体材料的聚合物光伏器件的性能。 其中，带有较短烷基链末端基团的烯丙基封端P3BT具有较高的结晶性，与PCBM具有适中的相容性，使得光伏器件的光敏层能够形成理想的微相分离结构，器件效率可以达到3.1%，较传统的溴封端P3BT器件效率提升35%以上。

Effect of Functional End-Group on Optoelectronic Properties of Poly(3-butylthiophene)

In this work, we systematically studied the optoelectronic properties of four poly(3-butylthiophene)(P3BT) with different functional end-groups. The end-groups were found to be detrimental to the crystallization of P3BT. Nevertheless, the end-groups could modify the surface energy of P3BT and therefore achieve the tunable miscibility and film morphology of P3BT∶PCBM blends. The solar cell devices based on these P3BTs with functional end-groups as donor materials have been fabricated and tested. We demonstrated that the allyl-terminated P3BT has relative higher crystallinity. And the appropriate miscibility of allyl-terminated P3BT and PCBM could lead to an ideal micro phase separation morphology of P3BT∶PCBM in the active layer of solar cell device. The corresponding photovoltaic device performance could reach 3.1% which is 35% higher than that ofconventional device using bromide-terminated P3BT.