Colloidal perovskite nanoplatelets can provide a material platform, with tunability extending from the deep UV, across the visible, into the near-IR. The high degree of spectral tunability can be achieved through variation of the cation, metal, and halide composition as well as nanoplatelet thickness.
Morphology-Controlled Synthesis of Organometal Halide Perovskite Inverse Opals
作者:Kun Chen、Harun Tüysüz
DOI:10.1002/anie.201506367
日期:2015.11.9
perovskites has not been achieved. A mild and scalable method to prepare organometalhalideperovskites in inverseopal morphology is presented that uses a polystyrene‐based artificial opal as hard template. Our method is flexible and compatible with different halides and organic ammonium compositions. Thus, the perovskiteinverseopal maintains the advantage of straightforward structure and band gap engineering
For the first time, we have synthesized APbBr3 (A = Cs+/MA+/FA+, where MA+ = CH3NH3+ and FA+ = CH(NH2)2+) bulk as well as nanoparticles (NPs) by solid-statereactions at roomtemperature.
Local Structure and Dynamics in Methylammonium, Formamidinium, and Cesium Tin(II) Mixed-Halide Perovskites from <sup>119</sup>Sn Solid-State NMR
作者:Dominik J. Kubicki、Daniel Prochowicz、Elodie Salager、Aydar Rakhmatullin、Clare P. Grey、Lyndon Emsley、Samuel D. Stranks
DOI:10.1021/jacs.0c00647
日期:2020.4.29
structure of mixed-cation and mixed-halide tin(II) halide perovskites as well as their degradation products and related phases. We establish that the longitudinal relaxation of 119Sn can span 6 orders of magnitude in this class of compounds, which makes judicious choice of experimental NMR parameters essential for the reliable detection of various phases. We show that Cl/Br and I/Br mixed-halide perovskites
有机-无机锡(II)卤化物钙钛矿已成为光电应用中卤化铅钙钛矿的有前途的替代品。虽然与铅类似物相比,它们的性能和稳定性要差得多,但迄今为止,由于严重缺乏探测其原子级微观结构的方法,它们的性能改进主要是通过反复试验来推动的。在这里,我们确定了挑战并设计了 119Sn 固态 NMR 协议,用于确定混合阳离子和混合卤化物锡 (II) 卤化物钙钛矿的局部结构及其降解产物和相关相。我们确定 119Sn 的纵向弛豫在此类化合物中可以跨越 6 个数量级,这使得明智地选择实验 NMR 参数对于可靠检测各种相至关重要。我们表明,Cl/Br 和 I/Br 混合卤化物钙钛矿以任何比例形成固体合金,而 I/Cl 组合物只能进行有限的混合。我们阐明了基于 Cs、MA 和 FA 的锡 (II) 卤化物的降解途径,并表明无论 A 位阳离子和卤化物如何,降解都会导致高度无序、性质相似的产品。我们检测到降解产物中存在金属锡,我们认为这可能有助于先前报道的锡
Low-dimensional non-toxic A<sub>3</sub>Bi<sub>2</sub>X<sub>9</sub> compounds synthesized by a dry mechanochemical route with tunable visible photoluminescence at room temperature
作者:Yousra El Ajjouri、Vladimir S. Chirvony、Natalia Vassilyeva、Michele Sessolo、Francisco Palazon、Henk J. Bolink
DOI:10.1039/c9tc01765h
日期:——
We have synthesized fifteen inorganic and hybrid organic–inorganic non-toxic A3Bi2X9 compounds (A = K+, Rb+, Cs+, CH3NH3+ and HC(NH2)2+; X = I−, Br−, Cl−) through dry mechanochemistry.