了解二维/三维钙钛矿界面的结构动力学

IF 8.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Alan B. Kaplan, Quinn C. Burlingame*, Marko R. Ivancevic and Yueh-Lin Loo*, 
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引用次数: 0

摘要

利用二维钙钛矿封盖层钝化三维钙钛矿活性层的表面缺陷在高性能卤化铅钙钛矿太阳能电池中已经普遍存在。然而,这些2D/3D界面可能是高度动态的,当暴露在热应力或光照下时,结构会演变成各种混合维度相。用烷基铵基二维钙钛矿覆盖的甲酰胺碘化铅(FAPbI3)薄膜在100°C或模拟1太阳光照下老化时的光致发光光谱变化表明,二维钙钛矿逐渐转变为更大的无机层厚度(用层数n表示),最终接近稳定状态,此时只有三维钙钛矿(n =∞)可检测到。我们发现,当有机单铵配体中烷基链的长度从丁铵增加到十二烷基铵时,这种转化减慢了约2倍。此外,用其对应物二铵配体1,12-十二烷二铵取代十二烷基铵,其结构转化速度减慢了10倍。这些结果表明,使用二铵配体作为形成稳定的2D/3D界面的可能途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Understanding the Structural Dynamics of 2D/3D Perovskite Interfaces

Understanding the Structural Dynamics of 2D/3D Perovskite Interfaces

The use of 2D perovskite capping layers to passivate the surface defects of 3D perovskite active layers has become ubiquitous in high performance lead halide perovskite solar cells. However, these 2D/3D interfaces can be highly dynamic, with the structure evolving to form various mixed dimensional phases when exposed to thermal stress or illumination. Changes in the photoluminescence spectrum of formamidinium lead iodide (FAPbI3) films capped with alkylammonium-based 2D perovskites as they age at 100 °C or under simulated 1 sun illumination indicate that the 2D perovskite transforms to progressively larger inorganic layer thicknesses (denoted by layer number n), eventually approaching a steady-state condition where only the 3D perovskite (n = ∞) is detectable. We find that this transformation slows by a factor of ∼2 when the length of the alkyl chain in the organic monoammonium ligand is increased from butylammonium to dodecylammonium. Furthermore, replacing dodecylammonium with its diammonium ligand counterpart, 1,12-dodecanediammonium, slows the structural transformation by 10-fold. These results point to the use of diammonium ligands as a possible pathway to form stable 2D/3D interfaces.

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来源期刊
ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces 工程技术-材料科学:综合
CiteScore
16.00
自引率
6.30%
发文量
4978
审稿时长
1.8 months
期刊介绍: ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.
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