材料科学
钝化
钙钛矿(结构)
甲胺
聚合物
晶界
光电效应
光电子学
纳米技术
化学工程
复合材料
图层(电子)
有机化学
微观结构
工程类
化学
作者
Xingyu Pu,Junsong Zhao,Yongjiang Li,Yixin Zhang,Loi Hok-Leung,Tong Wang,Hui Chen,Xilai He,Jiabao Yang,Xiaoyan Ma,Tongtong Li,Qi Cao
出处
期刊:Nano Energy
[Elsevier]
日期:2023-07-01
卷期号:112: 108506-108506
被引量:10
标识
DOI:10.1016/j.nanoen.2023.108506
摘要
Perovskite materials have excellent photoelectric properties and are a hot spot in international research. However, there are deep/shallow energy level traps in the grain boundaries (GBs)/surface of perovskite thin films, which affect the optoelectronic performance of perovskite solar cells (PSCs). Here, we design and synthesize a three-dimensional star-shaped polymer with various groups to regulate the light-absorbing layer of perovskite. The eight branched chains of multifunctional star polymer are rich in CO, N = N, N = O, and –CF3 functional groups, which are used to passivate uncoordinated lead ions and to immobilize methylamine, formamidine cations on the GBs/surface of perovskite films. Simultaneous passivation of deep-level defects and suppression the appearance of shallow-level defects on the perovskite surface/GBs, thereby greatly improving the optoelectronic performance of PSCs. Compared with the efficiency of 22.38 % of the reference device, the efficiency of the multifunctional star polymer incorporated inverted device reaches 24.03 %. Moreover, the multifunctional star-shaped polymer modified inverted-encapsulation device also exhibits excellent operational stability, maintaining 80 % of the initial efficiency for more than 5500 h.
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