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解析由二维电子限域主导的碘化铅的光电行为。

Disentangling the Optoelectronic Behavior of Lead Iodide Governed by Two-Dimensional Electron Confinement.

作者信息

Gouadria Hamida, Aguilar-Galindo Fernando, Álvarez-Alonso Jesús, de Miguel Juan José, Díaz-Tendero Sergio, Capitán María José

机构信息

Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain.

Departamento de Química, Universidad Autónoma de Madrid, 28049 Madrid, Spain.

出版信息

ACS Appl Mater Interfaces. 2024 Oct 23;16(42):57302-57315. doi: 10.1021/acsami.4c10507. Epub 2024 Oct 15.

DOI:10.1021/acsami.4c10507
PMID:39404171
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11503613/
Abstract

We present a joint experimental and theoretical study for complete spectroscopic characterization and optoelectronic properties of lead iodide. Experimentally, we combine X-ray diffraction experiments to elucidate the structure with photoelectron spectroscopy to explore its electronic structure. Computationally, simulations are performed in the frame of density functional theory. We show that PbI presents a two-dimensional layered structure and exhibits a large transient photocurrent effect under visible light illumination, which are compatible with the surface photovoltage scenario. The transient photocurrent has an extremely long lifetime: when the sample is lightened with visible light, it shows very long relaxation times and, consequently, huge charge carrier diffusion lengths. We explain this anomalous behavior with the slow carrier mobility of holes and electrons caused by the 2D electron confinement in the layered material. Our results can be used as a simple model for understanding the optoelectronic properties of more complex 2D hybrid perovskites.

摘要

我们展示了一项关于碘化铅完整光谱表征和光电特性的联合实验与理论研究。实验上，我们结合X射线衍射实验来阐明其结构，并利用光电子能谱来探索其电子结构。计算方面，在密度泛函理论框架下进行模拟。我们表明，PbI呈现二维层状结构，并且在可见光照射下表现出大的瞬态光电流效应，这与表面光电压情况相符。瞬态光电流具有极长的寿命：当样品用可见光照射时，它显示出非常长的弛豫时间，因此具有巨大的电荷载流子扩散长度。我们用层状材料中二维电子限制导致的空穴和电子的缓慢载流子迁移率来解释这种异常行为。我们的结果可作为理解更复杂二维混合钙钛矿光电特性的简单模型。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/9b2bb1f96d1d/am4c10507_0012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/34fc724faa08/am4c10507_0001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/7307c47278c3/am4c10507_0007.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/273fa19a90a4/am4c10507_0011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/9b2bb1f96d1d/am4c10507_0012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/34fc724faa08/am4c10507_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/bbcdafacc755/am4c10507_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/c81915c3a085/am4c10507_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/3b69aae2efd1/am4c10507_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/b2aede85ff1e/am4c10507_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/616aa6bf0a17/am4c10507_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/7307c47278c3/am4c10507_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/89e0d41d290a/am4c10507_0008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/9b64b1d197e9/am4c10507_0009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/c9889065fd74/am4c10507_0010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/273fa19a90a4/am4c10507_0011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c64c/11503613/9b2bb1f96d1d/am4c10507_0012.jpg

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