Al-Tawil Christina, El Kurdi Riham, Patra Digambara
Department of Chemistry, American University of Beirut, Beirut, Lebanon.
Photochem Photobiol Sci. 2023 Sep;22(9):2167-2178. doi: 10.1007/s43630-023-00439-9. Epub 2023 Jun 4.
Inorganic halide perovskites, such as CsPbI, have unique optoelectronic properties which made them promising candidates for several applications. Unfortunately, these perovskites undergo rapid chemical decomposition and transformation into yellow δ-phase. Thus, the synthesis of stable cesium lead iodide perovskites remains an actual challenging field and it is imperative to develop a stabilized black phase for photovoltaic applications. For this purpose, a surfactant ligand was used to control the synthesis of inorganic perovskite CsPbI nanoparticles. Herein we demonstrate a new avenue for lead halide perovskites with the addition of either hexadecyltrimethylammonium bromide (CTAB) or silica nanoparticles to maintain in the first place; the stability of the α-CsPbI phase, and later on to boost their photoluminescence quantum yield (PLQY). The prepared perovskites were characterized using UV-visible absorption spectroscopy, fluorescence spectroscopy, scanning electron microscopy, thermogravimetric analysis and X-Ray diffraction technique. Results show higher stability of α-CsPbI phase and improvement in PLQY % to reach 99% enhancement in presence of CTAB. Moreover, the photoluminescence intensity of CsPbI nanoparticles was higher and was maintained for a longer duration in the presence of CTAB.
无机卤化物钙钛矿，如CsPbI，具有独特的光电特性，这使其成为多种应用的有前途的候选材料。不幸的是，这些钙钛矿会迅速发生化学分解并转变为黄色的δ相。因此，合成稳定的碘化铯铅钙钛矿仍然是一个具有实际挑战性的领域，开发用于光伏应用的稳定黑色相势在必行。为此，使用表面活性剂配体来控制无机钙钛矿CsPbI纳米颗粒的合成。在此，我们展示了一种新途径，通过添加十六烷基三甲基溴化铵（CTAB）或二氧化硅纳米颗粒来制备卤化铅钙钛矿，首先保持α-CsPbI相的稳定性，随后提高其光致发光量子产率（PLQY）。使用紫外可见吸收光谱、荧光光谱、扫描电子显微镜、热重分析和X射线衍射技术对制备的钙钛矿进行了表征。结果表明，α-CsPbI相具有更高的稳定性，在CTAB存在下PLQY%提高，增强达到99%。此外，在CTAB存在下，CsPbI纳米颗粒的光致发光强度更高且能保持更长时间。
