Lova Paola, Giusto Paolo, Di Stasio Francesco, Manfredi Giovanni, Paternò Giuseppe M, Cortecchia Daniele, Soci Cesare, Comoretto Davide
Dipartimento di Chimica e Chimica Industriale, Università di Genova, 16146 Genova, Italy.
Nanoscale. 2019 May 9;11(18):8978-8983. doi: 10.1039/c9nr01422e.
Thanks to a high photoluminescence quantum yield, large charge carrier diffusion, and ease of processing from solution, perovskite materials are becoming increasingly interesting for flexible optoelectronic devices. However, their deposition requires wide range solvents that are incompatible with many other flexible and solution-processable materials, including polymers. Here, we show that methylammonium lead iodide (MAPbI3) films can be directly synthesized on all-polymer microcavities via simple addition of a perfluorinated layer which protects the polymer photonic structure from the perovskite processing solvents. The new processing provides microcavities with a quality factor Q = 155, that is in agreement with calculations and the largest value reported so far for fully solution processed perovskite microcavities. Furthermore, the obtained microcavity shows strong spectral and angular redistribution of the the MAPbI3 photoluminescence spectrum, which shows a 3.5 fold enhanced intensity with respect to the detuned reference. The opportunity to control and modify the emission of a MAPbI3 film via a simple spun-cast polymer structure is of great interest in advanced optoelectronic applications requiring high colour purity or emission directionality.
由于具有高光致发光量子产率、大电荷载流子扩散以及易于从溶液中加工等特性，钙钛矿材料在柔性光电器件领域变得越来越受关注。然而，它们的沉积需要使用与许多其他柔性且可溶液加工的材料（包括聚合物）不相容的多种溶剂。在此，我们展示了通过简单添加一层全氟化物层，甲基碘化铅（MAPbI3）薄膜可以直接在全聚合物微腔上合成，该全氟化物层可保护聚合物光子结构免受钙钛矿加工溶剂的影响。这种新的加工方法为微腔提供了品质因数Q = 155，这与计算结果相符，并且是迄今为止报道的全溶液加工钙钛矿微腔的最大值。此外，所获得的微腔显示出MAPbI3光致发光光谱强烈的光谱和角度再分布现象，与失谐参考相比，其强度增强了3.5倍。通过简单的旋涂聚合物结构来控制和改变MAPbI3薄膜的发射，这对于需要高色纯度或发射方向性的先进光电子应用具有极大的吸引力。
