Controllable Perovskite Crystallization by Water Additive for High-Performance Solar Cells
Controllable Perovskite Crystallization by Water Additive for High-Performance Solar Cells
复制标题
DOI：
10.1002/adfm.201503559
复制
发表时间：
2015-11-11
影响因子：
19
通讯作者：
Liao, Liang-Sheng
中科院分区：
文献类型：
--
作者：
Gong, Xiu;Li, Meng;Liao, Liang-Sheng
钙钛矿太阳能电池的一个关键问题是钙钛矿材料在环境条件下由于水分效应而引起的稳定性，尽管它们的效率不断提高。在此，通过在晶体钙钛矿生长期间使用水作为添加剂，证明了具有良好结晶和稳定性的改善的CH 3 NH3 PbI 3-xClx钙钛矿质量。在N，N-二甲基甲酰胺（DMF）中加入合适的水添加剂导致钙钛矿的可控生长，这是由于与DMF相比，水的沸点较低且蒸气压较高。此外，在退火过程中还生成了CH_3NH_3PbI_3-xCl_x中心点nH（2）O型水合钙钛矿，这种钙钛矿在一定程度上可以抵抗水分子的腐蚀。因此，与参考相比，基于水添加剂的钙钛矿太阳能电池呈现16.06%的高功率转换效率和在环境条件下改善的电池稳定性。本工作的研究结果为控制钙钛矿晶体的生长提供了一条途径，也为提高有机-无机卤化物钙钛矿的稳定性提供了一条线索。
A key issue for perovskite solar cells is the stability of perovskite materials due to moisture effects under ambient conditions, although their efficiency is improved constantly. Herein, an improved CH3NH3PbI3-xClx perovskite quality is demonstrated with good crystallization and stability by using water as an additive during crystal perovskite growth. Incorporating suitable water additives in N,N-dimethylformamide (DMF) leads to controllable growth of perovskites due to the lower boiling point and the higher vapor pressure of water compared with DMF. In addition, CH3NH3PbI3-xClx center dot nH(2)O hydrated perovskites, which can be resistant to the corrosion by water molecules to some extent, are assumed to be generated during the annealing process. Accordingly, water additive based perovskite solar cells present a high power conversion efficiency of 16.06% and improved cell stability under ambient conditions compared with the references. The findings in this work provide a route to control the growth of crystal perovskites and a clue to improve the stability of organic-inorganic halide perovskites.