基于CuBB为阴极缓冲层有机太阳能电池性能的研究

Performance of organic solar cells using CuBB as cathode buffer layer

通过定向合成Cu(I)配合物,首次将其作为阴极缓冲层引入到有机太阳能电池(OSCs)中。实验分析发现,OSCs的光电能量转换效率(PCE)与CuBB层厚度紧密相关,在标准太阳光照条件下,结构为ITO/CuPc(20nm)/C60(40nm)/CuBB(x mm)/Al(100nm)的器件PCE随着CuBB厚度的增加先增大后变小,当厚为8nm时PCE达到0.94%。器件性能提高的原因主要是CuBB具有良好的电子迁移率,但厚度过大时则由于串联电阻增加及电子不能经阴极缓冲层传输而使性能降低。

Organic solar cells （OSCs） have become the most potential photoelectric converter. In this paper,a Cu（I） complex was synthesized and employed in OSCs as cathode buffer layer. The experimental results show that the power conversion efficiency （PCE） of OSCs is closely associated with the thickness of cathode buffer layer. Under AM 1.5 solar illumination,the PCE increases in early stage and then decreases when the structure of OSCs is ITO/CuPc （20 nm）/C60 （40 nrn）/CuBB （x）/A1 （100 nm）. When the thickness of CuBB is 8 nm,the maximum efficiency is 0.94%. This can be understood as follows. CuBB has a good electron mobility, when thin CuBB layer decorates the cathode, which can provide a good ohmic contact and is in favor of electron transport. However,when the CuBB layer exceeds 8 nm, series resistor will increase and the electron wonr t transport through cathode buffer layer, then the power conversion efficiency decreases.