高性能厚膜倒置聚合物太阳电池

HIGH EFFCIENCY THICK FILM INVERTED STRUCTURE POLYMER SOLAR CELLS

采用300 nmPffBT4T-2OD:PC71BM活性层,分别制备倒置结构和正装结构聚合物太阳电池作对比研究。研究发现,2种器件的光电特性具有明显差异。实验测量外量子效率、内量子效率和模拟计算结果表明,这种差距受光吸收效率的影响较小,即使载流子迁移率不平衡,倒置器件也拥有更高的内量子效率。载流子收集效率较低是降低正装器件内量子效率,进一步减小短路电流密度和填充因子的主要因素。

Using 300 nm thick PffBT4T2OD:PC71BM active layer,inverted and conventional structure polymer solar cells were prepared for comparative study.The results indicate that the photovoltaic characteristics is significant difference among the two type of devices.The experimental external and internal quantum efficiency and simulated results show that light absorption efficiency has unobvious influence on the difference.The inverted device has better internal quantum efficiency even if the carrier mobility is unbalanced.The lower charge carriers collection efficiency is the main reason to reduce the internal quantum efficiency and further decrease the short circuit current density and fill factor of conventional devices.