Liu Yangyang, Cao Hui, Liu Xuhao, Zhu Rongzhi, Tao Tao, Sun Jinwei
School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, People's Republic of China.
School of Chemistry and Materials Science, Nanjing University of Information Science and Technology, Nanjing 210044, People's Republic of China.
Nanotechnology. 2021 Jun 8;32(35). doi: 10.1088/1361-6528/ac0028.
In this work, we report a novel two-dimensional (2D) (SrBr)PbIperovskite layered architecture, which were formed by the reaction of strontium bromide (SrBr), strontium iodide (SrI) and lead iodide (PbI). Formation of 2D (SrBr)PbIwas verified by small angle XRD peak at 6.4°, which corresponds to the layer distance of 13.78 Å. The best one of solar cells fabricated with Quasi-3D perovskite, (SrBr)FAPbI(= 60), showed a power conversion efficiency (PCE) of 18.46% and retained 95% of the initial PCE at 1000 h in the dry air. Further, the 2D (SrBr)PbIas the surface passivation layer on the 3D FAPbIperovskite greatly reduced the defects at the perovskite/Spiro-OMeTAD interface, and the corresponding solar cells with FAPbI/(SrBr)PbI3D/2D structure achieved a PCE of 22.14% and over 90% retention of the original PCE at 1000 h. In short, this work provides an example of inorganic complex cations that can form 2D perovskites and achieve perovskite solar cells with high PCE and stabilization at the same time.
在这项工作中，我们报道了一种新型的二维（2D）（SrBr）PbI钙钛矿层状结构，它是由溴化锶（SrBr）、碘化锶（SrI）和碘化铅（PbI）反应形成的。二维（SrBr）PbI的形成通过6.4°处的小角XRD峰得到验证，该峰对应于13.78 Å的层间距。用准三维钙钛矿（SrBr）FAPbI（= 60）制备的最佳太阳能电池的功率转换效率（PCE）为18.46%，在干燥空气中1000小时后仍保留初始PCE的95%。此外，二维（SrBr）PbI作为三维FAPbI钙钛矿上的表面钝化层，大大减少了钙钛矿/Spiro-OMeTAD界面处的缺陷，具有FAPbI/（SrBr）PbI 3D/2D结构的相应太阳能电池的PCE为22.14%，在1000小时后仍保留原始PCE的90%以上。简而言之，这项工作提供了一个无机复合阳离子可以形成二维钙钛矿并同时实现高PCE和稳定性的钙钛矿太阳能电池实例。
