Ling Tao, Zou Xiaoping, Cheng Jin, Bai Xiao, Ren Haiyan, Chen Dan
Research Center for Sensor Technology, Beijing Key Laboratory for Sensor, Ministry of Education Key Laboratory for Modern Measurement and Control Technology, School of Applied Sciences, Beijing Information Science and Technology University, Jianxiangqiao Campus, Beijing 100101, China.
Nanomaterials (Basel). 2018 Jun 9;8(6):416. doi: 10.3390/nano8060416.
High-class perovskite film with beautiful surface morphology (such as large-size grain, low defect density, good continuity and flatness) is normally believed to be a very important factor for high-efficiency perovskite solar cells (PSCs). Here, we report a modified sequential deposition route through localized-liquid-liquid-diffusion (LLLD) for qualified perovskite multi-crystalline thin films with micrometer-scaled grains for solar cells. We adopted a contact-type drop method to drop Methylammonium iodide (MAI) solution and have successfully used high-concentration MAI solution (73 mg/mL) to transform PbI₂ film into high-class perovskite film via our route. A high efficiency of 10.7% was achieved for the device with spongy carbon film deposited on a separated FTO-substrate as a counter electrode under one sun illumination, which is the highest efficiency (as 2.5 times as previous efficiency) ever recorded in perovskite solar cells with a such spongy carbon/FTO composite counter electrode. The preparation techniques of high-class perovskite thin films under ambient conditions and the cheap spongy carbon/FTO composite counter electrode are beneficial for large-scale applications and commercialization.
具有良好表面形貌（如大尺寸晶粒、低缺陷密度、良好的连续性和平整度）的高质量钙钛矿薄膜通常被认为是高效钙钛矿太阳能电池（PSC）的一个非常重要的因素。在此，我们报道了一种通过局部液-液扩散（LLLD）的改进的顺序沉积路线，用于制备具有微米级晶粒的合格钙钛矿多晶薄膜以用于太阳能电池。我们采用接触式滴涂法滴加甲基碘化铵（MAI）溶液，并通过我们的路线成功地使用高浓度MAI溶液（73 mg/mL）将PbI₂薄膜转化为高质量钙钛矿薄膜。在一个太阳光照下，以沉积在单独的FTO基板上的海绵状碳膜作为对电极的器件实现了10.7%的高效率，这是在具有这种海绵状碳/FTO复合对电极的钙钛矿太阳能电池中记录到的最高效率（是之前效率的2.5倍）。在环境条件下制备高质量钙钛矿薄膜的技术以及廉价的海绵状碳/FTO复合对电极有利于大规模应用和商业化。
