X射线光电子能谱
卤化物
钙钛矿(结构)
材料科学
铅(地质)
分析化学(期刊)
无机化学
环境化学
化学工程
化学
结晶学
地质学
地貌学
工程类
作者
James McGettrick,Katherine Hooper,Adam Pockett,Jenny Baker,Joel Troughton,Matthew J. Carnie,Trystan Watson
标识
DOI:10.1016/j.matlet.2019.04.081
摘要
X-ray Photoelectron spectroscopy (XPS) spectra of methyl ammonium lead halide perovskite films typically show the presence of lead as Pb(II), but Pb(0) is also often observed, potentially influencing the interpretation of the device physics. In this article the reproducible evolution of Pb(0) peaks which are likely artefacts generated under typical XPS analytical conditions are demonstrated from methyl ammonium lead halide films that contain no Pb(0) initially. The evolution of Pb(0) occurs via (1) X-ray photolysis under typical analytical conditions and (2) alongside other chemical changes as a result of film aging in air. In both cases we note the presence of PbI2 as a common factor contributing to in situ reactions to generate Pb(0) artefacts. Hence the observation of Pb(0) should be treated with extreme caution and here we recommend simple precautions to ensure materials analysis of these films gives reliable information when analyzed under UHV conditions.
科研通智能强力驱动
Strongly Powered by AbleSci AI