Laboratory of Nanochemistry for Energy Research, Institute of Chemical Sciences and Engineering, Ecole Politechnique Fédérale de Lausanne, Sion CH-1950, Switzerland.
Nanoscale. 2019 Nov 7;11(41):19543-19550. doi: 10.1039/c9nr06328e. Epub 2019 Oct 2.
A deeper understanding of the perovskite-metal chemistry is crucial to elucidate the instability problems at the device level that can be caused by such interactions. Here, we study the reactions occurring between CsPbX (X = Br, BrI, I) perovskite and metal (M = Ag, Cu, Au) nanocrystals. We demonstrate a fast (<1 hour) optical and structural degradation of the I-containing nanocrystals driven by the formation of metal iodides with reaction kinetics according to the following order Cu < Ag < Au. These results point to the need for thoughtful considerations while constructing optoelectronic devices out of all-inorganic CsPbX nanocrystals, where the use of contact metals is a necessity.
深入了解钙钛矿-金属化学对于阐明器件层面上由这种相互作用引起的不稳定性问题至关重要。在这里，我们研究了 CsPbX（X = Br、BrI、I）钙钛矿与金属（M = Ag、Cu、Au）纳米晶体之间发生的反应。我们证明了 I 包含的纳米晶体的快速（<1 小时）光和结构降解，由金属碘化物的形成驱动，反应动力学符合以下顺序 Cu < Ag < Au。这些结果表明，在构建全无机 CsPbX 纳米晶体的光电设备时，需要深思熟虑，而使用接触金属是必要的。
