钝化
微晶
钙钛矿(结构)
材料科学
光致发光
扫描电子显微镜
晶界
薄膜
光电子学
退火(玻璃)
纳米技术
化学
结晶学
微观结构
复合材料
冶金
图层(电子)
作者
Qi Chen,Huanping Zhou,Tze‐Bin Song,Song Luo,Ziruo Hong,Hsin‐Sheng Duan,Letian Dou,Yongsheng Liu,Yang Yang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2014-06-24
卷期号:14 (7): 4158-4163
被引量:1439
摘要
To improve the performance of the polycrystalline thin film devices, it requires a delicate control of its grain structures. As one of the most promising candidates among current thin film photovoltaic techniques, the organic/inorganic hybrid perovskites generally inherit polycrystalline nature and exhibit compositional/structural dependence in regard to their optoelectronic properties. Here, we demonstrate a controllable passivation technique for perovskite films, which enables their compositional change, and allows substantial enhancement in corresponding device performance. By releasing the organic species during annealing, PbI2 phase is presented in perovskite grain boundaries and at the relevant interfaces. The consequent passivation effects and underlying mechanisms are investigated with complementary characterizations, including scanning electron microscopy (SEM), X-ray diffraction (XRD), time-resolved photoluminescence decay (TRPL), scanning Kelvin probe microscopy (SKPM), and ultraviolet photoemission spectroscopy (UPS). This controllable self-induced passivation technique represents an important step to understand the polycrystalline nature of hybrid perovskite thin films and contributes to the development of perovskite solar cells judiciously.
科研通智能强力驱动
Strongly Powered by AbleSci AI