Luo Paifeng, Xia Wei, Zhou Shengwen, Sun Lin, Cheng Jigui, Xu Chenxi, Lu Yingwei
Department of Materials Science and Engineering, Hefei University of Technology , Hefei, Anhui 230009, People's Republic of China.
J Phys Chem Lett. 2016 Sep 15;7(18):3603-8. doi: 10.1021/acs.jpclett.6b01576. Epub 2016 Aug 30.
Inorganic CsPbI3 perovskite solar cells (PSCs) owning comparable photovoltaic performance and enhanced thermal stability compared to organic-inorganic hybrid perovskites have attracted enormous interest in the past year. However, it is still a challenge to stabilize the desired black α-CsPbI3 perovskites in ambient air for photovoltaic applications. Herein, sequential solvent engineering including the addition of hydroiodic acid (HI) and subsequent isopropanol (IPA) treatment for fabricating stable and working CsPbI3 PSCs is developed, and a novel low-temperature phase-transition route from new intermediate Cs4PbI6 to stable α-CsPbI3 is also released for the first time. As such, the as-prepared PSCs give a relatively high power conversion efficiency (PCE) of 4.13% (reverse scan), and the steady-state power output of 1.88% is confirmed for the selected cell with an initial PCE of 3.13%. To the best of our knowledge, this is the first demonstration of fabricating CsPbI3 inorganic PSCs under fully open-air conditions.
与有机-无机杂化钙钛矿相比，无机CsPbI3钙钛矿太阳能电池（PSC）具有相当的光伏性能和更高的热稳定性，在过去一年中引起了极大的关注。然而，在环境空气中稳定所需的黑色α-CsPbI3钙钛矿用于光伏应用仍然是一个挑战。在此，开发了包括添加氢碘酸（HI）和随后的异丙醇（IPA）处理在内的连续溶剂工程，用于制备稳定且可工作的CsPbI3 PSC，并且首次公布了一种从新中间体Cs4PbI6到稳定α-CsPbI3的新型低温相变途径。因此，所制备的PSC给出了相对较高的功率转换效率（PCE）为4.13%（反向扫描），对于初始PCE为3.13%的选定电池，确认其稳态功率输出为1.88%。据我们所知，这是首次在完全露天条件下制备CsPbI3无机PSC的演示。
