Singh Rajan Kumar, Gouraha Sourabh, Singh Anupriya, Jain Neha, Singh Jai
Department of Physics, Dr H. S. Gour Central University, Sagar, 470003, M. P., India.
Department of Pure and Applied Physics, Guru Ghasidas Vishwavidyalaya (A Central University), Bilaspur, C.G. 495006, India.
Methods Appl Fluoresc. 2022 Oct 18;10(4). doi: 10.1088/2050-6120/ac9775.
In contemporary years, hybrid lead halide perovskites nanocrystals (HPNCs) have emerged as core materials for low-cost solution-processable photovoltaic, light-emitting devices as well as in other optoelectronic fields, such as high-efficiency perovskite fluorescent quantum dots (quantum dot, QD). Although the high efficiency makes them an attractive active material, reducing the Pb-toxicity and enhancing the stability while sustaining the efficiency of the HPNCs devices is important for their successful commercialization in future. Here, we report for the first time the fabrication of excellent quality Pb-less, MAPbSnBr( = 0 to 0.50) perovskite NCs by one-pot ultrasonication method. Interestingly, an outstanding photoluminescence quantum yield (PLQY) of 94% and better lifetime performance than 100% Pb-based HPNCs is obtained for Pb-less HPNCs. The successful incorporation of Sn MAPbSnBrHPNCs is confirmed by energy-dispersive x-ray (EDX) and x-ray photoelectron spectroscopy (XPS) analysis. Although the particle size for Pb-less HPNCs was different, the change in morphology and structure was minimal as confirmed by transmission electron microscopy (TEM) analysis. The optical analysis indicated bandgap tuning, which is evident by the blue shift of the band edge in absorbance spectra and photoluminescence peak after incorporating Sn. To the best of our knowledge, this is the highest achieved PLQY for Sn-substituted hybrid Pb-based HPNCs. The synthesis by using one pot ultrasonication method might be helpful for large-scale HPNCs production and can pave the way for future research on less-toxic and stable alternatives to Pb-based HPNCs.
近年来，混合卤化铅钙钛矿纳米晶体（HPNCs）已成为低成本溶液可加工光伏、发光器件以及其他光电子领域的核心材料，如高效钙钛矿荧光量子点（量子点，QD）。尽管其高效率使其成为一种有吸引力的活性材料，但在维持HPNCs器件效率的同时降低铅毒性并提高稳定性对于其未来成功商业化至关重要。在此，我们首次报道通过一锅超声法制备出高质量的无铅MAPbSnBr（x = 0至0.50）钙钛矿纳米晶体。有趣的是，无铅HPNCs获得了94%的出色光致发光量子产率（PLQY）以及比100%铅基HPNCs更好的寿命性能。通过能量色散X射线（EDX）和X射线光电子能谱（XPS）分析证实了Sn成功掺入MAPbSnBr HPNCs中。尽管无铅HPNCs的粒径不同，但通过透射电子显微镜（TEM）分析证实其形态和结构变化最小。光学分析表明带隙调谐，这在掺入Sn后吸收光谱的带边蓝移和光致发光峰中很明显。据我们所知，这是Sn取代的混合铅基HPNCs所实现的最高PLQY。采用一锅超声法合成可能有助于大规模生产HPNCs，并可为未来研究毒性更低、更稳定的铅基HPNCs替代品铺平道路。
