On the growth of CH3NH3PbI3-xClx single crystal and characterization

In this paper, CH 3 NH 3 PbI 3-x Cl x crystal was grown by solution cooling method with CH 3 NH 3 I and PbCl 2 as raw materials. Lead compounds and CH 3 NH 3 PbI 3-x Cl x crystal with size about 6 mm × 4 mm × 2 mm were obtained. The chemical reactions with different CH 3 NH 3 I/PbCl 2 ratios were analyzed. XPS shows the content of chlorine in CH 3 NH 3 PbI 3-x Cl x is about 0.91%. PXRD, FT-IR, Raman and absorbance spectra were used to study the structure and optical properties of CH 3 NH 3 PbI 3-x Cl x by comparing with CH 3 NH 3 PbI 3 crystal. The CH 3 NH 3 PbI 3-x Cl x crystal grown is of tetragonal structure with the lattice constants a = b = 8.8165 Å, c = 12.7920 Å and the bandgap value of 1.57 eV.