1D Pyrrolidinium Lead Iodide for Efficient and Stable Perovskite Solar Cells

摘要： Due to the superior environmental stability, the utilization of low-dimensional perovskites in organometal halide solar cells (OMHSCs) has been on the sharp increase. Herein, we report a method to in situ form one-dimensional pyrrolidinium lead iodide (1D PyPbI3) atop the photoactive three-dimensional methylammonium lead iodide (3D MAPbI3) using pyrrolidine post-treatment. As compared to the 3D MAPbI3, the 1D PyPbI3 has a wider bandgap and is more environmentally stable, which serves as a tunnelling contact to mitigate charge carrier recombination and robust barrier against environmental degradation when incorporated into OMHSCs. Accordingly, power conversion efficiencies of the resulting MAPbI3 devices were enhanced from an average of 14.86 ± 0.65% to 15.9 ± 0.58% while shelf-life stability was significantly prolonged.