【摘 要】
：
分别以Ca/Al和Al作为电极制备了基于PCDTBT和PC70BM的体相异质结聚合物太阳能电池.与单纯以Al为电极的器件相比,基于Ca/Al电极的器件的开路电压(VOC)、短路电流(JSC)、填充因子(FF)以及能量转化效率(PCE)均有明显的提高.为了理解金属电极是如何影响器件的性能,利用瞬态光伏技术(TPV)和同步辐射光电子能谱(SRPES)分别对Ca/PCDTBT和Al/PCDTBT的界面进
【机 构】
：
中国科学技术大学国家同步辐射实验室,安徽合肥230029
【出 处】
：
2014年全国博士后新材料技术与应用学术论坛
论文部分内容阅读
分别以Ca/Al和Al作为电极制备了基于PCDTBT和PC70BM的体相异质结聚合物太阳能电池.与单纯以Al为电极的器件相比,基于Ca/Al电极的器件的开路电压(VOC)、短路电流(JSC)、填充因子(FF)以及能量转化效率(PCE)均有明显的提高.为了理解金属电极是如何影响器件的性能,利用瞬态光伏技术(TPV)和同步辐射光电子能谱(SRPES)分别对Ca/PCDTBT和Al/PCDTBT的界面进行了细致的研究.通过TPV测量了器件中的载流子寿命和浓度,发现相比于以Al为电极的器件,以Ca/Al为电极的器件的载流子复合速率常数要小很多.通过高分辨率的SRPES研究了金属电极/PCDTBT界面的化学反应和能带结构,研究发现在Ca/PCDTBT界面产生较强的界面偶极,从而有利于电子从PCDTBT传输到电极,同时排斥空穴使其远离电极/活性层的界面.因此,金属Ca电极在聚合物界面通过偶极作用降低了器件中的载流子复合速率常数,从而提高了器件的性能.
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