期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 2, 页码 3127-3133出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b17047
关键词
2D perovskite; phase distribution; growth manipulation; charge transfer; heating-spinning method
资金
- National Natural Science Foundation of China [21805010, 51673025, 21975028]
- National Key Research and Development Program of China [2016YFB0700700]
- Beijing Municipal Science and Technology [Z181100005118002]
Two-dimensional (2D) lead halide perovskite has recently been recognized as a promising candidate to stabilize perovskite solar cells due to its extraordinary moisture resistance. These 2D perovskite films often consist of multiple phases with layered (n) lead halide (from n = 1, 2, 3 to approximate to infinity). However, a convincing evidence is still lacking to clarify the phase distribution with respect to different n, thus causes the misleading for device design. Herein, confocal photoluminescence (PL) spectroscopy was applied to probe the inhomogeneity of 2D perovskite films along the vertical direction to construct a clear-phase distribution mapping consequently. It reveals that the 2D perovskite phases (n = 2, 3, 4) locate preferentially near the substrate, while large n phases are predominantly near the top surface. Moreover, we successfully developed a simple method to manipulate the phase distribution in 2D perovskite thin films, which results in a dramatic increase of device efficiency from 4.95 to 11.6%. Our findings thus provide insights to the understanding of 2D perovskite film growth. The utilization of visualized phase distribution data could also guide the further development of 2D perovskite materials for optoelectronic devices.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据