基于BCP/PEIE双电子传输层提高聚合物太阳能电池性能

Improving the Performance of Polymer Solar Cells Based on BCP/PEIE Double Electron Transport Layer

界面传输层对聚合物太阳能电池性能有很大影响,而合适的电子传输层(ETL)可以有效提高聚合物太阳能电池的性能。本文将BCP和聚乙烯亚胺(PEIE)结合作为双电子传输层应用于倒置聚合物太阳能电池,得到了基于BCP/PEIE双电子传输层器件3.44%的光电转换效率(PCE),相比于单层PEIE电子传输层器件提高了14.3%(仅仅有PEIE界面层的器件获得3.01%转换效率)。通过电化学阻抗谱和电导率测量表明,引入BCP界面层后形成了有效的欧姆接触,降低了界面界面接触电阻,提高了电荷传输,从而提高了器件性能。

The interface transport layer has a great influence on the performance of polymer solar cells,and the appropriate electronic transport layer(ETL)can effectively improve the performance of polymer solar cells.In this paper,BCP and polyethyleneimine(PEIE)were combined as a double ETL for inverted polymer solar cells.A high power conversion efficiency(PCE)of 3.44%based BCP/PEIE double ETL was achieved,which is 14.3%higher than that of the pristine devices(the PCE of pristine devices with PEIE interface layer is 3.01%).Electrochemical impedance and conductivity measurements indicate that the effective Ohmic contact is formed when the introduction of BCP interface layer,which reduces the interface contact resistance and improves the charge transfer,thereby improving the device performance.