钙钛矿太阳能电池的制备工艺与光伏性能研究

设计和制备结构为FTO玻璃/TiO2致密层/TiO2介孔层/CH3NH3PbI3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;.

Preparation Processes and Photovoltaic Performance of Perovskite Solar Cells

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 mA/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.