Publication in refereed journal
香港中文大学研究人员 ( 现职)
| 许建斌教授 (电子工程学系) |
| 严克友教授 (电子工程学系) |
全文
| 数位物件识别号 (DOI) http://dx.doi.org/10.1021/jacs.5b00321 |
引用次数
Web of Sciencehttp://aims.cuhk.edu.hk/converis/portal/Publication/110WOS source URL
Scopushttp://aims.cuhk.edu.hk/converis/portal/Publication/113Scopus source URL
其它资讯
摘要The precursor of solution-processed perovskite thin films is one of the most central components for high-efficiency perovskite solar cells. We first present the crucial colloidal chemistry visualization of the perovskite precursor solution based on analytical spectra and reveal that perovskite precursor solutions for solar cells are generally colloidal dispersions in a mother solution, with a colloidal size up to the mesoscale, rather than real solutions. The colloid is made of a soft coordination complex in the form of a lead polyhalide framework between organic and inorganic components and can be structurally tuned by the coordination degree, thereby primarily determining the basic film coverage and morphology of deposited thin films. By utilizing coordination engineering, particularly through employing additional methylammonium halide over the stoichiometric ratio for tuning the coordination degree and mode in the initial colloidal solution, along with a thermal leaching for the selective release of excess methylammonium halides, we achieved full and even coverage, the preferential orientation, and high purity of planar perovskite thin films. We have also identified that excess organic component can reduce the colloidal size of and tune the morphology of the coordination framework in relation to final perovskite grains and partial chlorine substitution can accelerate the crystalline nucleation process of perovskite. This work demonstrates the important fundamental chemistry of perovskite precursors and provides genuine guidelines for accurately controlling the high quality of hybrid perovskite thin films without any impurity, thereby delivering efficient planar perovskite solar cells with a power conversion efficiency as high as 17% without distinct hysteresis owing to the high quality of perovskite thin films. (Figure Presented).
着者Yan K., Long M., Zhang T., Wei Z., Chen H., Yang S., Xu J.
期刊名称Journal of the American Chemical Society
出版年份2015
月份3
日期17
卷号137
期次13
出版社American Chemical Society
出版地United States
页次4460 - 4468
国际标準期刊号0002-7863
语言英式英语
