制备了基于聚(3-己基噻吩)(P3HT)与可溶性富勒烯衍生物(PCBM)共混体系的太阳能电池。通过改变活性层退火处理时惰性气氛环境的压强，在一定程度上实现对共混物相分离以及聚合物结晶度的控制，研究了LiF作为阴极缓冲层对不同压强下退火处理的器件性能的影响。实验发现，LiF层的关键作用在于稳定开路电压以及提升短路电流，从而带动转化效率整体提升。结果表明，LiF层可以改善器件活性层与金属电极接触的界面形态，而器件的最终性能则由活性层的微观形貌与电极界面形态共同决定。

Organic photovoltaic devices based on the bulk heterojunction of poly(3-hexylthiophene) and ［6,6］-phenyl-C61 butyric acid methyl ester(P3HT∶PCBM) have been fabricated in this work. We have studied that the effects of LiF, as cathode buffer layer, on the performance of pre-annealed devices under various ambient pressure. The results indicate that the key role of ultrathin LiF layer is to increase the short circuit current and maintain the open circuit voltage, which can improve the power conversion efficiencies. Nevertheless, the performance of polymer solar cells are mainly determined by the morphology of active layer and the configuration of interface between electrode and blend layer, while the latter could be improved by cathode buffer layer.