Zero Threshold for Water Adsorption on MAPbBr3.
Zero Threshold for Water Adsorption on MAPbBr3.
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DOI：
10.1002/smll.202301014
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发表时间：
2023-06
期刊：
影响因子：
13.3
通讯作者：
Robert McDougall Kerr;Thomas J. Macdonald;Alex J. Tanner;Jiangdong Yu;Julia A Davies;H. Fielding;G. Thornton
中科院分区：
文献类型：
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作者：
Robert McDougall Kerr;Thomas J. Macdonald;Alex J. Tanner;Jiangdong Yu;Julia A Davies;H. Fielding;G. Thornton
杂化有机-无机钙钛矿（HOIP）在广泛的光电应用中显示出巨大的前景。然而，这种性能受到HOIP对各种环境因素的敏感性的抑制，特别是高水平的相对湿度。本研究使用X射线光电子能谱（XPS），以确定基本上没有阈值的水吸附在原位裂解MAPbBr 3（001）单晶表面。使用扫描隧道显微镜（STM），它表明，暴露于水蒸气后的初始表面重构发生在孤立的区域，随着暴露量的增加，在面积上增长，提供洞察HOIP的初始降解机制。通过紫外光电子能谱（UPS）的表面的电子结构的演变也进行了监测，证明了增加的带隙态密度以下的水蒸气暴露，这是由于表面缺陷的形成，由于晶格膨胀。这项研究将有助于为未来钙钛矿基光电器件的表面工程和设计提供信息。
Hybrid organic-inorganic perovskites (HOIPs) have shown great promise in a wide range of optoelectronic applications. However, this performance is inhibited by the sensitivity of HOIPs to various environmental factors, particularly high levels of relative humidity. This study uses X-ray photoelectron spectroscopy (XPS) to determine that there is essentially no threshold to water adsorption on the in situ cleaved MAPbBr3 (001) single crystal surface. Using scanning tunneling microscopy (STM), it shows that the initial surface restructuring upon exposure to water vapor occurs in isolated regions, which grow in area with increasing exposure, providing insight into the initial degradation mechanism of HOIPs. The electronic structure evolution of the surface was also monitored via ultraviolet photoemission spectroscopy (UPS), evidencing an increased bandgap state density following water vapor exposure, which is attributed to surface defect formation due to lattice swelling. This study will help to inform the surface engineering and designs of future perovskite-based optoelectronic devices.