On the determination of absorption cross section of colloidal lead halide perovskite quantum dots
On the determination of absorption cross section of colloidal lead halide perovskite quantum dots
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DOI：
10.1063/1.5126039
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发表时间：
2019-10-21
影响因子：
4.4
通讯作者：
Son, Dong Hee
中科院分区：
文献类型：
--
作者：
Puthenpurayil, Joseph;Cheng, Oscar Hsu-Cheng;Son, Dong Hee
卤化铅钙钛矿纳米晶体的吸收截面对于理解其光物理性质非常重要，特别是那些取决于光激发电荷载流子密度的光物理性质。尽管它很重要，但采用不同方法确定的报告吸收截面值之间存在很大差异。在这里，我们使用元素分析和瞬态吸收（TA）饱和方法测量了不同尺寸的CsPbBr3量子点（QD）的吸收截面，并与之前报道的元素分析和瞬态光致发光（PL）饱和方法确定的值进行了比较。仔细比较表明，卤化铅钙钛矿量子点的可靠吸收截面是通过元素分析和TA饱和方法获得的，而许多先前报道的通过PL饱和方法确定的值低估了吸收截面。由 AIP Publishing 许可发布。
The absorption cross section of lead halide perovskite nanocrystals is important for understanding their photophysical properties, especially those depending on the density of photoexcited charge carriers. Despite its importance, there are large discrepancies among the reported absorption cross section values determined employing different methods. Here, we measured the absorption cross section of CsPbBr3 quantum dots (QDs) of varying sizes using elemental analysis and transient absorption (TA) saturation methods and compared with the previously reported values determined from elemental analysis and transient photoluminescence (PL) saturation methods. A careful comparison indicates that the reliable absorption cross section of lead halide perovskite QDs is obtained from both elemental analysis and TA saturation methods, while many previously reported values determined from the PL saturation method underestimate the absorption cross section. Published under license by AIP Publishing.