利用1-乙基-3-甲基碘化咪唑鎓离子液体的界面钝化改善钙钛矿太阳电池性能  

Improvement of the Perovskite Solar Cell Performances by Interfacial Passivation with 1-Ethyl-3-Methylimidazolium Iodide Ionic Liquid

作　　者：李慧敏[1] 阎钰瑛 Li Huimin;Yan Yuying(College of Humanities and Information,Changchun University of Technology,Changchun 130122,China)

机构地区：[1]长春工业大学人文信息学院,长春130122

出　　处：《微纳电子技术》2022年第11期1126-1133,共8页Micronanoelectronic Technology

摘　　要：提升钙钛矿太阳电池(PSC)的光电转换效率(PCE)和稳定性是钙钛矿电池制备走向商业化的关键。寻找合适的材料对电池的界面进行钝化被认为是一种高效且必要的解决方案。将1-乙基-3-甲基碘化咪唑鎓([EMIM]I)离子液体沉积在钙钛矿层与空穴传输层的界面,发现[EMIM]I可与钙钛矿层中多余的碘化铅结合,[EMIM]I中的碘阴离子填补钙钛矿结构中的卤素空位,从而减小界面和晶界处的缺陷。对电池的光电性能进行测试,结果表明,由于经[EMIM]I钝化过的界面得到优化,电池的电荷传输能力有所提升,电荷复合行为被抑制。未经离子液体修饰过的电池的光电转换效率为18.49%,而经离子液体修饰过的电池光电转换效率提高到了19.22%,并展现出了更好的稳定性。该研究成果可为未来钙钛矿太阳电池商业化制备和结构设计提供一定的参考。Improving the photoelectic conversion efficiency(PCE)and stability of perovskite solar cells(PSCs)is the key to the commercialization of perovskite cell fabrication.It is considered to be an efficient and necessary solution to find suitable materials to passivate the interface within the cells.The 1-ethyl-3-methylimidazolium iodide([EMIM]I)ionic liquid was deposited at the interface between the perovskite layer and hole transport layer.It is found that[EMIM]I can integrate with the redundant lead iodide in the perovskite layer.The iodine anion from[EMIM]I can fill the halogen vacancy of the perovskite structure,thus reducing defects at the interface and grain boundaries.The photoelectric performance of the cell was tested.The results show that due to the optimized interface after passivation with[EMIM]I,the charge transmission capacity of the cell is improved and the charge recombination behavior is inhibited.The PCE of the cell modified without the ionic liquid is 18.49%,the PCE of the cell modified by the ionic liquid increases to 19.22%,and the cell exhibits better stability.The research results can provide a reference for the future perovskite solar cells in the aspects of commercialization preparation and structural design.

关 键 词：钙钛矿太阳电池 离子液体 界面钝化 缺陷 光电转换效率 

分 类 号：TM914.4[电气工程—电力电子与电力传动]