能量学
X射线光电子能谱
紫外光电子能谱
结合能
材料科学
单层
光致发光
配体(生物化学)
电子亲和性(数据页)
化学物理
碘化物
表面改性
纳米技术
化学工程
化学
钙钛矿(结构)
表面能
物理化学
无机化学
分子
光电子学
结晶学
原子物理学
工程类
物理
受体
生态学
有机化学
生物
生物化学
作者
Somin Park,Ashkan Abtahi,Alex Boehm,Kenneth R. Graham
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2020-02-10
卷期号:5 (3): 799-806
被引量:57
标识
DOI:10.1021/acsenergylett.0c00054
摘要
Surface ligand treatment provides a promising approach for passivating defect states, improving material and device stability, manipulating interfacial energetics, and improving the performance of perovskite solar cells (PSCs). To facilitate targeted selection and design of surface ligands for PSCs, it is necessary to establish relationships between ligand structure and perovskite surface properties. Herein, surface ligands with different binding groups are investigated to determine their extent of surface coverage, whether they form a surface monolayer or penetrate the perovskite, how they influence material energetics and photoluminescence, and how this combination of factors affects PSC performance. Ultraviolet and inverse photoelectron spectroscopy measurements show that surface ligands can significantly shift the ionization energy and electron affinity. These changes in surface energetics substantially impact PSC performance, with the performance decreasing for ligands that create less favorable energy landscapes for electron transfer from MAPbI3 to the electron transport layer, C60.
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