Na1.88Bi1.88S4和Na1.36Ca1.28Bi1.36S4单晶制备r与结构及其光学性能表征

摘要

采用碘化钠为助熔剂,通过固相反应法制备了两种晶体质量较好的Na1.88Bi1.88S4和Na1.36Ca1.28Bi1.36S4单晶.测试结果表明,它们属于氯化钠结构,面心立方,空间群为Fm-3m.形貌表征和物性测试结果表明,在碘化钠的作用下,化合物Na1.88Bi1.88S4和Na1.36Ca1.28Bi1.36S4呈现双锥状形貌,沿(111)晶面择优取向生长,带隙分别为1.29和1.45 eV.通过光电器件性能测试,发现两种化合物均表现出良好的光电响应特性,说明它们可以作为一类潜在的、性能优良的光电开关材料.%Na1.88Bi1.88S4 and Na1.36Ca1.28Bi1.36S4 single crystals of high quality were successfully synthesized by sol-id-state reaction method using NaI as flux. Both compounds crystallize in the rocksalt structure type of a cubic Fm-3m space group. The preferred orientation growth of lattice face (111) were observed in both two compounds. The optical absorption measurements show that the band gap of Na1.88Bi1.88S4 and Na1.36Ca1.28Bi1.36S4 compounds are 1.29 eV and 1.45 eV, respectively. Two compounds were fabricated into devices that exhibit notable photoelectric behavior, suggesting their potential for applications as photoelectric switches.