纳米ZnO墨水的溶剂及浓度优化及其在钙钛矿太阳能电池中的应用

纳米金属Zn O作为界面缓冲材料能够有效提高基于有机金属卤化物-甲基碘化铵的钙钛矿(PVSK)太阳能电池的水氧稳定性,是溶液制备高稳定性钙钛矿太阳能电池的一个关键技术。而在器件的制备过程中,Zn O分散溶剂的渗透可能导致下层钙钛矿薄膜的结构物性发生变化,从而对器件性能造成显著的影响。为解决该问题,本文详细分析了不同极性有机溶剂对Zn O分散性的影响,研究了不同溶剂对PVSK/PCBM薄膜的吸收光谱和晶体结构的影响,最终获得了甲醇-正丁醇混合溶剂的体积比为1∶1、Zn O质量浓度为10 mg·m L-1的优化分散体系,为进一步开展全溶液法制备钙钛矿太阳能电池提供了重要指导。

Solvent and Concentration Optimization of Nano-ZnO Inks and Their Application in Perovskite Solar Cells

ZnO nanoparticle has been used as cathode buffer layer ( CBL ) in organo-lead halide perovskite ( PVSK) solar cells to improve device stability against oxygen and moisture. For solution processing procedure, solvents for dissolving ZnO has to be carefully optimized, since solvent pene-tration during the CBL deposition might cause the decomposition of the PVSK film. Aiming at the development of nano-ZnO inks for using in PVSK solar cells, the current work systematically investi-gate the dispersibility of nano-ZnO in various polar solvents, including acetone, methanol, ethanol, isopropanol, n-butanol, and a mixture solvent of methanol∶n-buthanol ( MeOH∶n-BuOH, 1∶1, v/v) , and the influence of such solvent on the UV-Vis absorption and crystalline properties of the un-derlying PVSK/PCBM film. PVSK solar cells with a device structure of ITO/PEDOT∶ PSS/PSS/PVSK/PCBM/ZnO/Al were then fabricated and tested. The optimized nano-ZnO ink is found to be MeOH∶n-BuOH mixture solvent based (1∶1, v/v) with a concentration of 10 mg·mL-1 . The cur-rent work provides an important guideline for developing CBL inks for PVSK solar cells.