Simple post annealing-free method for fabricating uniform, large grain-sized, and highly crystalline perovskite films
Simple post annealing-free method for fabricating uniform, large grain-sized, and highly crystalline perovskite films
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DOI：
10.1016/j.nanoen.2017.02.017
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发表时间：
2017-04-01
期刊：
影响因子：
17.6
通讯作者：
Park, Taiho
中科院分区：
文献类型：
--
作者：
Byranvand, Mahdi Malekshahi;Song, Seulki;Park, Taiho
我们报道了一种简单的无后退火（PAF）方法，用于制备均匀，大晶粒尺寸和高度结晶的三重阳离子钙钛矿薄膜。在这个简单的过程中，将钙钛矿前体溶液旋涂到TiO 2介孔基底上，随后在旋转过程中将乙醚（DEE）作为抗溶剂滴到薄膜上，以产生钙钛矿薄膜的中间相（IP）。该IP立即在室温下浸入DEE浴中仅1分钟，以代替常规的后退火（PA）处理。采用X射线粉末衍射、紫外-维斯吸收光谱、傅立叶变换红外光谱、扫描电子显微镜、原子力显微镜和光致发光光谱对所制备的PAF薄膜进行了表征。PAF器件的总功率转换效率（PCE）在18.8- 19.5%的范围内，这与所报道的PA器件（17.2-18.1%）相当，这主要是由于J（SC）和FF值，这是由PAF膜中的高吸收能力和具有更好的表面光滑度的大晶体尺寸引起的。该效率是通过PAF方法的钙钛矿沉积所报道的最高效率。这种新方法能够减少室温下的器件制造时间，这将降低制造高效钙钛矿太阳能电池的成本。
We report a simple post annealing-free (PAF) method for making uniform, large grain-sized, and highly crystalline triple cation perovskite films. In this simple process, a perovskite precursor solution was spin-coated onto a TiO2 mesoporous substrate and as an antisolvent, diethyl ether (DEE) was subsequently dripped onto the film during spinning to produce an intermediate phase (IP) of perovskite film. This IP was immediately immersed into a DEE bath at room temperature for only 1 min in replacement of the conventional post annealing (PA) treatment. The as-prepared PAF film was characterized by X-ray powder diffraction, UV vis absorption spectroscopy, fourier transform infrared spectroscopy, scanning electron microscopy, atomic-force microscopy, and photoluminescence spectroscopy. The overall power conversion efficiency (PCE) of the PAF devices was in the range of 18.8-19.5%, which is comparable with the reported PA devices (17.2-18.1%), mainly due to the J(SC) and the FF values, caused by the high absorption ability and the large crystal size with better surface smoothness in the PAF film. This efficiency is the highest reported for perovskite deposition by PAF methods. This new method enables reducing the device fabrication time at room temperature, which will reduce the cost of manufacturing efficient perovskite solar cells.