A composite of methylammonium lead iodide perovskite (MAPbI[Formula: see text] and carbon dots is prepared under ultrasound irradiation. Characterizations of X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, emission field scanning electron microscopy, Raman spectra and UV-Vis diffuse reflectance spectroscopy are performed. Excellent photoelectrochemical properties of prepared composites are examined by a collection of measurements including photocurrent density, open-circuit potential, current–voltage curves, cyclic voltammetry curves and Nyquist plots. The results imply that the as-prepared composites exhibit better electrochemical and photoelectrochemical properties as well as stability than those of blank MAPbI3. The improved properties are due to the formed Pb–O–C bridge bonds in the composites, which can promote the generation and transport of charge carriers. This work provides a novel sonochemical synthesis strategy and investigation on the photoelectrochemical performance of MAPbI3/carbon dots composites.

中文翻译：

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用碳点修饰 MAPbI3 钙钛矿以增强光电化学性能和稳定性

在超声辐照下制备了甲基铵碘化铅钙钛矿（MAPbI[分子式：见正文]和碳点的复合材料。X射线衍射、傅里叶变换红外光谱、X射线光电子能谱、透射电子显微镜、发射场扫描电子的表征进行显微镜、拉曼光谱和紫外-可见漫反射光谱分析，通过一系列测量结果检查制备的复合材料的优异光电化学性能，包括光电流密度、开路电位、电流-电压曲线、循环伏安曲线和奈奎斯特图。表明所制备的复合材料比空白 MAPbI 具有更好的电化学和光电化学性能以及稳定性3. 改进的性能是由于在复合材料中形成了 Pb-O-C 桥键，这可以促进电荷载流子的产生和传输。这项工作提供了一种新的声化学合成策略和对 MAPbI 光电化学性能的研究3/碳点复合材料。