利用金属卤化物掺杂剂控制CH3NH3PbI3薄膜的聚集态结构及光伏性能

构建均匀、致密的光敏层薄膜是实现高性能有机金属卤化物钙钛矿太阳电池的前提条件。项目组前期实验证实：在常用的CH3NH3PbI3前驱体溶液中掺杂适量的NiCl2或MnCl2后，旋涂制备的合金薄膜的致密性得到显著提高。因此，提出如下假说： 掺杂剂金属阳离子的半径对合金薄膜的聚集态结构有重要调节作用。本项目拟利用非铅金属卤化物掺杂剂与CH3NH3PbI3一起形成新颖的双金属钙钛矿合金材料，系统地研究溶液加工薄膜的聚集态结构，从晶体学上阐明掺杂剂金属阳离子半径影响合金薄膜聚集态结构的机理。揭示钙钛矿薄膜的光吸收谱、光伏器件性能与合金构成的关系，以期获得光吸收范围宽、在无介孔支架层存在的条件下仍可方便地采用溶液加工法直接制备均匀、致密的薄膜，为可重复性地制备高性能钙钛矿太阳电池开拓新路径，并为该类型太阳电池未来的商业化积蓄技术。

It is a prerequisite to prepare homogeneous and dense photoactive-layer films for realizing high performance organometal halide perovskite solar cells. In our preliminary investigation, we found that after doping certain amount of NiCl2 or MnCl2 into the precursor solution of CH3NH3PbI3, the spin-coated films turned out to be very homogeneous and dense as compared to those without doping. Therefore, we assume that the radius of metal cation in dopant can significantly influence on the aggregation structure of the perovskite alloy films. We plan to form series CH3NH3PbI3-based perovskite alloys by using nonlead halide dopants, and disclose the effect of radius of metal cations in dopants on the phase aggregation structure of the alloy films from the viewpoint of crystallography. Also, this research will shed light on the relationship between light absorption spectrum, photovotaic performance and alloy components.The outcome of this research will provide us a new route, which can not only produce perovskite alloys having wide range of absorption spectra but also can form homogeneous and dense films via solution processing without the help of mesoporous scaffold layer, to reproducible preparation of high performance perovskite solar cells and their furture commerciallization.