基于MoO_(3)/Au/ZnO中间层的有机叠层太阳能电池

Tandem Organic Solar Cells Based on MoO_(3)/Au/ZnO Inter⁃connecting Layer

采用宽带隙有机材料PTB7-Th:PC71BM作为前电池,窄带隙有机材料PTB7-Th:IEICO-4F作为后电池,MoO_(3)/Au/ZnO薄膜作为中间连接层制备叠层电池。在本研究中,利用真空热蒸发和磁控溅射镀膜的方法制备了MoO_(3)/Au/ZnO薄膜,不仅具有高透光率,而且有很好的抗溶剂侵蚀性能。此外,为了进一步降低在旋涂后电池活性层时溶液对前电池的侵蚀,采用低沸点的氯仿作为后电池活性层材料的溶剂,并利用动态旋涂成膜的方法,减少溶剂挥发时间。最后获得了效率为9.35%的有机叠层太阳能电池,与单结有机太阳能电池相比,拥有更高的效率,开路电压高达1.4 V。研究表明:MoO_(3)/Au/ZnO薄膜在制备叠层太阳能电池中具有很大的优势。

The wide-band gap organic material PTB7-Th:PC71BM was used as the front cell,the narrow-band gap organic material PTB7-Th:IEICO-4F was used as the rear cell,and the MoO_(3)/Au/ZnO film was used as the interconnecting layer(ICL)to fabricate a tandem cell.MoO_(3)/Au/ZnO film was prepared by evaporation and sputtering,which not only had high light transmittance,but also good resistance to solvent erosion.In addition,in order to further reduce the erosion of the so‐lution to the front cell when the cell active layer was spin-coated,chloroform with a low boiling point was selected as the solvent of the rear cell and the dynamic spin coating method was used to reduce the solvent volatilization time.Finally,a tandem organic solar cell with the power conversion efficiency(PCE)of 9.35%was obtained,which had higher PCE and an open circuit voltage(Voc)of up to 1.4 V compared with single-junction organic solar cells.The results showed that MoO_(3)/Au/ZnO thin films could have great advantages in the preparation of tandem solar cells.