【摘要】 设计和制备结构为FTO玻璃/TiO₂致密层/TiO₂介孔层/CH-3NH₃PbI₃吸收层/C电极的钙钛矿太阳能电池。采用两步法制备CH₃NH₃PbI₃吸收层:首先通过旋涂技术制备PbI₂薄膜,然后将PbI₂薄膜在浓度为0.044 mol/L的甲基碘化胺/异丙醇（MAI/IPA）溶液中分别浸泡反应0.5 h、2.5 h、3.5 h和4.0 h后获得CH3NH3PbI₃吸收层。研究了浸泡反应时间对CH₃NH₃PbI₃吸收层的结构和形貌以及对电池光伏性能的影响。结果表明:PbI₂薄膜在MAI/IPA溶液中反应后形成四方结构的CH₃NH₃PbI₃晶粒,当浸泡反应3.5 h时,CH₃NH₃PbI₃晶粒的平均尺寸最大,均匀性较好;XRD图谱中只有CH₃NH₃PbI₃的特征峰,而PbI₂的特征峰完全消失。同时,该条件下制备的钙钛矿太阳能电池的光伏性能最佳,其开路电压0.881 V、短路电流密度达到22.17 mA/cm²,光电转化效率6.79%,且在整个可见光区的光子-电子的转换效率接近50%。更多还原

【Abstract】 The perovskite solar cells with structure of glass/FTO/compact TiO₂/mesoporous TiO₂/CH₃NH₃PbI₃ film/carbon electrode were prepared,and the photovoltaic performance of solar cells was studied. The perovskite CH₃NH₃PbI₃ layers were prepared by two-step method. First,PbI₂ thin films were deposited by spin coating method. Second,to grow perovskite layers,PbI₂ films were dipped into 0.044 mol/L of MAI/IPA solution for 0. 5 h,2. 5 h,3. 5 h and 4. 0 h,respectively. The effect of dipping time on structure and morphology of perovskite layers,as well as photovoltaic performance of perovskite solar cells were studied. The results indicate that the full conversion of PbI₂ to perovskite carry out and the average grain size of CH₃NH₃PbI₃ is the largest when dipping time is 3. 5 h. The perovskite solar cells prepared at dipping time of 3. 5 h exhibited an optimal photovoltaic performance,which demonstrate the open circuit voltage of 0. 881 V,short-circuit current density of 22. 17 m A/cm²,power conversion efficiency of 6. 79%,and the efficiently of incident photons converting to the electrons（ IPCE） of close to 50% in visible range.更多还原