Unraveling Reversible Quenching Processes of O2, N2, Ar, and H2O in Metal Halide Perovskites at Moderate Photon Flux Densities,Advanced Optical Materials

当前位置： X-MOL 学术 › Adv. Opt. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Unraveling Reversible Quenching Processes of O2, N2, Ar, and H2O in Metal Halide Perovskites at Moderate Photon Flux Densities
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-09-13 , DOI: 10.1002/adom.202001317
Edgar R. Nandayapa ₁ , Katrin Hirselandt ₁ , Christine Boeffel ₂ , Eva L. Unger ₁ , Emil J. W. List‐Kratochvil _{1,

3}

Affiliation

Metal halide perovskites (MHP), as used in photovoltaic (PV) applications, show a rich photophysics in inert and ambient atmosphere. The presence of atmospheric molecules leads to processes that enhance as well as reduce their photoluminescence (PL) emission. Various phenomena are previously described for a wide variety of gas molecules and different classes of MHP, with a particular interest on the long-term stability for PV applications. However, reversible PL quenching (PLQ) processes, which may be regarded equally important for the performance of PV and other optoelectronic applications, are neglected in other studies. This holds true for O₂ and H₂O, but especially for low-reactive gases such as nitrogen and argon. Using low excitation densities, it is shown that noticeable—and reversible—PLQ, in addition to PL enhancements, can already be observed for O₂, N₂, and Ar as well as for H₂O at low concentrations of 1 mbar. The nature and origin of the quenching processes are further elucidated by applying the Stern–Volmer analysis, also employed to determine whether static and dynamic PLQ processes happen for the different quenching gases. The strongest static PLQ is found for O₂ and H₂O. MHPs in N₂ and Ar atmospheres display a moderate PLQ effect.

中文翻译：

在中等光子通量密度下解开金属卤化物钙钛矿中 O2、N2、Ar 和 H2O 的可逆淬火过程

用于光伏 (PV) 应用的金属卤化物钙钛矿 (MHP) 在惰性和环境大气中显示出丰富的光物理特性。大气分子的存在导致增强和降低其光致发光 (PL) 发射的过程。先前针对各种气体分子和不同类别的 MHP 描述了各种现象，特别关注 PV 应用的长期稳定性。然而，可逆 PL 淬火 (PLQ) 过程可能被认为对 PV 和其他光电应用的性能同样重要，但在其他研究中却被忽略了。这适用于 O ₂和 H ₂O，但特别适用于低反应性气体，如氮气和氩气。使用低激发密度，表明除了 PL 增强之外，对于 O ₂、N ₂和 Ar 以及在 1 mbar 的低浓度下的H ₂ O，已经可以观察到显着且可逆的 PLQ 。通过应用 Stern-Volmer 分析进一步阐明了淬火过程的性质和起源，也用于确定不同淬火气体是否发生静态和动态 PLQ 过程。O ₂和H ₂ O 的静态PLQ 最强。N ₂和Ar 气氛中的MHP显示出中等PLQ 效应。

更新日期：2020-09-13

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11