Kyushu Institute of Technology , 204 Hibikino , Wakamatsu-ku, Kitakyushu 808-0196 , Japan.
ACS Appl Mater Interfaces. 2018 Jul 25;10(29):24543-24548. doi: 10.1021/acsami.8b06619. Epub 2018 Jul 13.
Despite the high efficiency of MAPbI perovskite solar cells, the long term stability and degradation in humid atmosphere are issues that still needed to be addressed. In this work, magnesium iodide (MgI) was first successfully used as a dopant into MAPbI perovskite prepared in humid air atmosphere. Mg doping decreased the valence band level, which was determined from photoelectron yield spectroscopy. Compared to the pristine MAPbI perovskite film, the 1.0% Mg-doped perovskite film showed increased crystal grain size and formation of pinhole-free perovskite film. Performance of the solar cell was increased from 14.2% of the doping-free solar cell to 17.8% of 1.0% Mg-doped device. Moreover, 90% of the original power conversion efficiency was still retained after storage in 30-40% relative humidity for 600 h.
尽管钙钛矿太阳能电池的效率很高，但在潮湿气氛中的长期稳定性和降解问题仍然需要解决。在这项工作中，碘化镁（MgI）首次成功地用作在潮湿空气气氛中制备的 MAPbI 钙钛矿的掺杂剂。Mg 掺杂降低了价带能级，这是从光电子产额光谱确定的。与原始的 MAPbI 钙钛矿薄膜相比，1.0%Mg 掺杂的钙钛矿薄膜显示出更大的晶粒尺寸和无针孔钙钛矿薄膜的形成。太阳能电池的性能从无掺杂太阳能电池的 14.2%提高到 1.0%Mg 掺杂器件的 17.8%。此外，在相对湿度为 30-40%的环境中储存 600 小时后，原始功率转换效率的 90%仍得以保留。
