分别采用LiF和2,9-二甲基-4,7-二苯基-1,10-菲咯啉（BCP）作为聚3-己基噻吩（P3HT）/[6,6]-苯基-C61-丁酸甲脂（PCBM）体系聚合物光伏电池阴极界面层,研究了高温后退火处理对不同界面层器件性能的影响。研究发现,LiF界面层的引入,在活性层和阴极界面之间形成了较强的偶极作用,从而改善了电池的性能,进一步高温热退火处理后仍能保持良好的界面作用,使器件的能量转换效率得到了进一步的提高。然而BCP界面层的引入,虽然阻挡了金属电极Al到PCBM的电子转移,导致复合减小,提高了器件的开路电压,但是在进一步高温后退火之后,BCP界面层的完整性遭到破坏,因此使得器件的能量转换效率降低。
The effects of thermal annealing on poly（3-hexylthiophene）（P3HT）/-phenyl C61-butyric acid methyl ester（PCBM） blend photovoltaic cells with different cathode interfacial layers（LiF and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline（BCP）） were investigated.The insertion of LiF interfacial layer formats the strong dipole moment across the junction and increases the power conversion efficiency（PCE） of the device.The dipole may become stronger when the device is post-annealed.Thus the PCE of the cell is further increased for the combination of post-annealing and interfacial layer.On the other hand,the insertion of BCP interfacial layer formats a barrier to charge injection from the metal electrode into PCBM and decreases the free carriers to recombine resulting in the increase the open-circuit voltage（Voc）.However,post-annealing may cause a discontinuous BCP film and destroy its connection between the P3HT/PCBM layer and Al cathode,and therefore the performance decreases.
参考文献
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