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Transformation of Cs3Bi2Br9 to Cs2AgBiBr6 Lead-Free Perovskite Microcrystals Through Cation Exchange
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-05-04 , DOI: 10.1002/adom.202300578 Lotte Clinckemalie 1 , Rafikul Ali Saha 2 , Donato Valli 1 , Eduard Fron 1 , Maarten B. J. Roeffaers 2 , Johan Hofkens 1 , Bapi Pradhan 1 , Elke Debroye 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-05-04 , DOI: 10.1002/adom.202300578 Lotte Clinckemalie 1 , Rafikul Ali Saha 2 , Donato Valli 1 , Eduard Fron 1 , Maarten B. J. Roeffaers 2 , Johan Hofkens 1 , Bapi Pradhan 1 , Elke Debroye 1
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All-inorganic lead-free Cs2AgBiBr6 double perovskites have gained significant attention due to their potential as stable and nontoxic photoactive semiconductors. Currently, it remains challenging to synthesize homogeneous microcrystals (MCs) exhibiting excellent properties, which are necessary for large-area device integration. This work proposes a two-step synthesis approach involving the introduction of a foreign silver cation to transform the 0D layered Cs3Bi2Br9 to 3D Cs2AgBiBr6 perovskite structure. This work has studied the cation exchange (CE) transformation mechanism by isolating intermediates to be able to follow the evolution of the crystal lattice as well as the structural and optical properties over time. Moreover, complete CE results in phase-pure, highly crystalline Cs2AgBiBr6 MCs exhibiting excellent photonic properties, superior to their counterparts synthesized by anti-solvent precipitation. These findings highlight the potential of CE-induced transformation as a means of synthesizing novel, stable perovskites.
中文翻译：
通过阳离子交换将 Cs3Bi2Br9 转化为 Cs2AgBiBr6 无铅钙钛矿微晶
全无机无铅Cs 2 AgBiBr 6双钙钛矿因其作为稳定且无毒的光活性半导体的潜力而受到广泛关注。目前，合成具有优异性能的均质微晶（MC）仍然具有挑战性，而这对于大面积器件集成来说是必需的。这项工作提出了一种两步合成方法，涉及引入外来银阳离子，将 0D 层状 Cs 3 Bi 2 Br 9转化为 3D Cs 2 AgBiBr 6钙钛矿结构。这项工作通过分离中间体来研究阳离子交换（CE）转化机制，以便能够跟踪晶格以及结构和光学性质随时间的演变。此外，完整的CE导致相纯、高度结晶的Cs 2 AgBiBr 6 MC表现出优异的光子性质，优于通过反溶剂沉淀合成的对应物。这些发现凸显了 CE 诱导转化作为合成新型稳定钙钛矿手段的潜力。
更新日期：2023-05-04
中文翻译：
通过阳离子交换将 Cs3Bi2Br9 转化为 Cs2AgBiBr6 无铅钙钛矿微晶
全无机无铅Cs 2 AgBiBr 6双钙钛矿因其作为稳定且无毒的光活性半导体的潜力而受到广泛关注。目前，合成具有优异性能的均质微晶（MC）仍然具有挑战性，而这对于大面积器件集成来说是必需的。这项工作提出了一种两步合成方法，涉及引入外来银阳离子，将 0D 层状 Cs 3 Bi 2 Br 9转化为 3D Cs 2 AgBiBr 6钙钛矿结构。这项工作通过分离中间体来研究阳离子交换（CE）转化机制，以便能够跟踪晶格以及结构和光学性质随时间的演变。此外，完整的CE导致相纯、高度结晶的Cs 2 AgBiBr 6 MC表现出优异的光子性质，优于通过反溶剂沉淀合成的对应物。这些发现凸显了 CE 诱导转化作为合成新型稳定钙钛矿手段的潜力。
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