Tai Qidong, You Peng, Sang Hongqian, Liu Zhike, Hu Chenglong, Chan Helen L W, Yan Feng
Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, 999077 Kowloon, Hong Kong.
Institute for Interdisciplinary Research and Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, 430056 Wuhan, China.
Nat Commun. 2016 Apr 1;7:11105. doi: 10.1038/ncomms11105.
Poor stability of organic-inorganic halide perovskite materials in humid condition has hindered the success of perovskite solar cells in real applications since controlled atmosphere is required for device fabrication and operation, and there is a lack of effective solutions to this problem until now. Here we report the use of lead (II) thiocyanate (Pb(SCN)2) precursor in preparing perovskite solar cells in ambient air. High-quality CH3NH3PbI3-x(SCN)x perovskite films can be readily prepared even when the relative humidity exceeds 70%. Under optimized processing conditions, we obtain devices with an average power conversion efficiency of 13.49% and the maximum efficiency over 15%. In comparison with typical CH3NH3PbI3-based devices, these solar cells without encapsulation show greatly improved stability in humid air, which is attributed to the incorporation of thiocyanate ions in the crystal lattice. The findings pave a way for realizing efficient and stable perovskite solar cells in ambient atmosphere.
由于在器件制造和运行过程中需要可控的气氛，有机-无机卤化物钙钛矿材料在潮湿条件下稳定性较差，这阻碍了钙钛矿太阳能电池在实际应用中的成功，并且到目前为止，对于这个问题还缺乏有效的解决方案。在此，我们报道了在环境空气中使用硫氰酸铅（II）（Pb(SCN)₂）前驱体制备钙钛矿太阳能电池。即使相对湿度超过70%，也能轻松制备出高质量的CH₃NH₃PbI₃₋ₓ(SCN)ₓ钙钛矿薄膜。在优化的工艺条件下，我们获得了平均功率转换效率为13.49%、最大效率超过15%的器件。与典型的基于CH₃NH₃PbI₃的器件相比，这些未封装的太阳能电池在潮湿空气中表现出大大提高的稳定性，这归因于晶格中硫氰酸根离子的掺入。这些发现为在环境大气中实现高效稳定的钙钛矿太阳能电池铺平了道路。
