溶液法合成的功能无机材料氧化镍对钙钛矿太阳能电池光电性能的影响

Effect of the functional inorganic material nickel oxide synthesized by solution method on the photoelectric performance of perovskite solar cells

功能无机材料氧化镍(NiO_(x))作为钙钛矿太阳能电池中最有前途的空穴传输材料之一,其有着高空穴迁移率、良好的稳定性、易于加工以及适合的费米能级等优点。但是,由于NiO_(x)自身固有电导率低,Ni空位的电离能相当大,未掺杂的NiO_(x)中空穴密度受到很大限制,加上孔洞的积累增加了载流子复合的可能,从而降低了有效的电荷收集。因此,优化NiO_(x)薄膜的成膜质量是解决上述问题的关键。本文通过溶液法使用乙二醇甲醚(MEA)、乙醇(EA)和去离子水作为溶液,分别制备了DME-NiO_(x)、EA-NiO_(x)和NCs-NiO_(x)薄膜,并在浓度调节范围内对基于NiO_(x)的钙钛矿器件进行优化,最终得到了光电转化效率(PCE)为18.50%,开路电压(V_(oc))为1.034 V,短路电流(J_(sc))为22.94 mA/cm^(2),填充因子(FF)为78%的最佳器件。

Functional inorganic material nickel oxide(NiO_(x))as one of the most promising hole transport materials in perovskite solar cells,it has the advantages of high hole mobility,good stability,easy processing and suitable Fermi level.However,due to the inherent low conductivity of NiO_(x) itself,the ionization energy of Ni vacancies is quite large,and the hole density in undoped NiO_(x) is greatly restricted.In addition,the accumulation of holes increases the possibility of carrier recombination,thereby reducing the effective charge collection.Therefore,optimizing the quality of NiO_(x) film formation is the key to solving the above problems.In this paper,DME-NiO_(x),EA-NiO_(x) and NCs-NiO_(x) films were prepared by solution method using ethylene glycol methyl ether(MEA),ethanol(EA)and deionized water as solutions.And optimized the NiO_(x)-based perovskite device within the concentration adjustment range.In the end,the best device with a photoelectric conversion efficiency(PCE)of 18.50%,an open circuit voltage(V_(oc))of 1.034 V,a short circuit current(J_(sc))of 22.94 mA/cm^(2) and a fill factor(FF)of 78%is obtained.