用于高效混合钙钛矿太阳能电池的非浸润表面驱动的高纵横比晶粒生长
Non-wetting surface-driven high-aspect-ratio crystalline grain growth for efficient hybrid perovskite solar cells.
作者信息
Bi Cheng, Wang Qi, Shao Yuchuan, Yuan Yongbo, Xiao Zhengguo, Huang Jinsong
机构信息
1] Department of Mechanical and Materials Engineering, College of Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0656, USA [2] Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0656, USA.
出版信息
Nat Commun. 2015 Jul 20;6:7747. doi: 10.1038/ncomms8747.
Large-aspect-ratio grains are needed in polycrystalline thin-film solar cells for reduced charge recombination at grain boundaries; however, the grain size in organolead trihalide perovskite (OTP) films is generally limited by the film thickness. Here we report the growth of OTP grains with high average aspect ratio of 2.3-7.9 on a wide range of non-wetting hole transport layers (HTLs), which increase nucleus spacing by suppressing heterogeneous nucleation and facilitate grain boundary migration in grain growth by imposing less drag force. The reduced grain boundary area and improved crystallinity dramatically reduce the charge recombination in OTP thin films to the level in OTP single crystals. Combining the high work function of several HTLs, a high stabilized device efficiency of 18.3% in low-temperature-processed planar-heterojunction OTP devices under 1 sun illumination is achieved. This simple method in enhancing OTP morphology paves the way for its application in other optoelectronic devices for enhanced performance.
多晶薄膜太阳能电池需要大纵横比的晶粒，以减少晶界处的电荷复合；然而，有机铅三卤化物钙钛矿（OTP）薄膜中的晶粒尺寸通常受薄膜厚度限制。在此，我们报告了在各种非润湿性空穴传输层（HTL）上生长平均纵横比高达2.3 - 7.9的OTP晶粒，这些HTL通过抑制异质形核增加核间距，并通过施加较小的阻力促进晶粒生长中的晶界迁移。晶界面积的减小和结晶度的提高显著降低了OTP薄膜中的电荷复合，使其达到OTP单晶中的水平。结合几种HTL的高功函数，在1个太阳光照下的低温处理平面异质结OTP器件中实现了18.3%的高稳定器件效率。这种改善OTP形貌的简单方法为其在其他光电器件中提高性能的应用铺平了道路。
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