研究目的
To synthesize and characterize CH3NH3PbI3 and CH3NH3PbI(3-x)Clx perovskite solar cell materials, focusing on optimizing the synthesis process and understanding the structural properties.
研究成果
The synthesis time for MAI can be significantly reduced by changing the solvent from dimethylformamide to acetone. XRD and XAS results indicate that Cl cannot substitute for I in the perovskite structure, providing insights into the structural properties of hybrid perovskite materials.
研究不足
The study is limited by the sensitivity of MAI to moisture and the inability of Cl to substitute for I in the perovskite structure, as confirmed by XRD and XAS.
1：Experimental Design and Method Selection:
The synthesis of MAI was carried out using a sol-gel method with different solvents, and the perovskite powders were prepared by a solid-state method.
2：Sample Selection and Data Sources:
MAI was synthesized from methylamine and hydroiodic acid, and perovskite powders were prepared from MAI and PbI2 or PbCl2 precursors.
3：List of Experimental Equipment and Materials:
Bruker instrument for XRD, XAS facility at Siam Photon Laboratory for XAS spectra.
4：Experimental Procedures and Operational Workflow:
MAI synthesis in an ice-water bath, perovskite powder preparation in a nitrogen-filled glovebox, thermal annealing at different temperatures and times.
5：Data Analysis Methods:
XRD for structural analysis, XAS for electronic structure analysis, FEFF code for XANES spectra calculation.
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