Ultrasmooth organic-inorganic perovskite thin-film formation and crystallization for efficient planar heterojunction solar cells
Ultrasmooth organic-inorganic perovskite thin-film formation and crystallization for efficient planar heterojunction solar cells
复制标题
DOI：
10.1038/ncomms7142
复制
发表时间：
2015-01-01
影响因子：
16.6
通讯作者：
Snaith, Henry J.
中科院分区：
文献类型：
--
作者：
Zhang, Wei;Saliba, Michael;Snaith, Henry J.
迄今为止，已经有大量关于制造有机-无机金属卤化物钙钛矿薄膜的不同方法的报道;然而，无机起始材料限于基于卤化物的阴离子。在这里，我们研究了钙钛矿溶液中的阴离子的作用及其对钙钛矿晶体生长，成膜和器件性能的影响。我们发现，通过使用非卤化物铅源（乙酸铅）代替氯化铅或碘化铅，钙钛矿晶体生长更快，这使我们能够通过简单的一步溶液涂覆获得超光滑且几乎无针孔的钙钛矿薄膜，只需几分钟退火。这种合成导致在平面异质结结构中改善的器件性能，并回答了结晶过程中阴离子和过量有机组分的作用的关键问题。我们的工作为通过简单的化学方法调节晶体生长动力学铺平了道路。
To date, there have been a plethora of reports on different means to fabricate organic-inorganic metal halide perovskite thin films; however, the inorganic starting materials have been limited to halide-based anions. Here we study the role of the anions in the perovskite solution and their influence upon perovskite crystal growth, film formation and device performance. We find that by using a non-halide lead source (lead acetate) instead of lead chloride or iodide, the perovskite crystal growth is much faster, which allows us to obtain ultrasmooth and almost pinhole-free perovskite films by a simple one-step solution coating with only a few minutes annealing. This synthesis leads to improved device performance in planar heterojunction architectures and answers a critical question as to the role of the anion and excess organic component during crystallization. Our work paves the way to tune the crystal growth kinetics by simple chemistry.