研究目的
Investigating the possible existence of mixed methylammonium (MA)/dimethylammonium (DMA) lead bromide hybrid perovskites and their structural and optical properties.
研究成果
The study demonstrates the existence of mixed MA/DMA lead bromide compositions with a cubic symmetry up to a DMA content of 30%. Beyond this threshold, DMA cannot be incorporated into the lattice, leading to two-phase compositions. The optical properties show a progressive blue shift with increasing DMA content, indicating a possible impact on the electronic structure.
研究不足
The solubility limit of DMA in MAPbBr3 is around x = 0.30, beyond which two-phase systems are formed. The optical properties show a progressive blue shift with increasing DMA content, but the mechanism behind this shift is not fully understood.
1：Experimental Design and Method Selection:
The synthesis of MA1?xDMAxPbBr3 samples was attempted for x = 0,
2：05, 15, 3, 4, 5, 6, 7, 8, 9, and A combined X-ray diffraction and solid-state nuclear magnetic resonance approach was used to investigate the samples. Sample Selection and Data Sources:
Samples were synthesized by dissolving Pb acetate in an excess of HBr under nitrogen atmosphere and stirring, followed by the addition of the corresponding amine solution.
3：List of Experimental Equipment and Materials:
Bruker D8 diffractometer for XRD, Bruker Avance II 400 Ultra Shield instrument for SSNMR, Agilent Cary 5000 UV?vis?NIR spectrometer for diffused reflectance measurements, Coherent Libra laser for time-resolved photoluminescence, Varian Cary Eclipse Fluorescence spectrophotometer for steady-state PL spectra.
4：Experimental Procedures and Operational Workflow:
The solution was heated to 100 °C, and the amine solution was added. The precipitate was filtered and dried under vacuum overnight. XRD and SSNMR measurements were performed to characterize the samples.
5：Data Analysis Methods:
XRD data were fitted by the Le Bail method using the FullProf suite of programs. SSNMR spectra were analyzed for chemical shifts and integral values.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
