通过制备四种不同结构的器件,详细分析研究了活性层／阴极界面修饰对P3HT:PCBM聚合物体异质结太阳能电池性能的影响。当在P3HT:PCBM薄膜上旋涂一层PCBM,并蒸镀0.5 nm LiF时所制备的器件的填充因子和光电转换效率都得到较大的提高。对器件的光电性能和薄膜的形貌进行深入分析,阐明界面修饰的作用机理。

Four types of devices with different structures were fabricated, and the influences of organic layer／cathode surface modification to the performance of bulk heterojunction polymer solar cells were investigated in details. When depositing a layer of PCBM on the surface of P3HT:PCBM thin film by spin-coating, followed by the deposition of a 0.5nm-thick LiF, the fill factor and power conversion efficiency of the polymer solar cells can be improved significantly. The origination of the improvement was investigated by studying the optoelectronic properties of the solar cells and the morphology of the organic thin films.