亚稳态正交相Cu_2ZnSnS_4(CZTS)颗粒的制备与表征  

Preparation and characterization of metastable orthorhombic Cu_2ZnSnS_4 particles

作　　者：马超群[1] 周超[1,2] 张天财[2] 胡兆勇[1] 高延敏[1] 

机构地区：[1]江苏科技大学先进焊接技术省级重点实验室,镇江212003 [2]上海船舶工艺研究所,上海200032

出　　处：《化工新型材料》2015年第6期136-139,共4页New Chemical Materials

基　　金：国家自然科学基金(51075197);江苏科技大学研究生创新基金(YCX11S-24)

摘　　要：采用水热法,以CuCl·22H2O、Zn(Ac)·22H2O、SnCl·45H2O作金属源,硫脲作硫源,在乙二胺和去离子水混合溶液中合成亚稳态正交相CZTS颗粒。利用XRD、Raman、SEM、TEM、EDS、UV-Vis吸收光谱探讨了乙二胺与去离子水比例对产物相结构、形貌、原子比以及光学性能的影响。结果表明:随着体系中乙二胺与去离子水比例的增加,所得CZTS颗粒相结构由锌黄锡矿逐渐转变为亚稳态正交相;颗粒形貌、化学计量比、光学性能也发生明显变化;当体系中乙二胺与去离子水比例为1∶1时,合成的颗粒为纯相亚稳态正交相结构、结晶性较好、颗粒形貌为不规则立方体、原子比1.7∶1.1∶1∶4、光学带隙1.53eV,与太阳能电池所需的最佳带隙接近。最后,还发现在充满S气氛中,450℃条件下退火处理1h,可实现亚稳态正交相向锌黄锡矿结构转变。The metastable orthorhombic Cu2ZnSnS4（CZTS）particles were successfully synthesized by a facile hydrothermal method in ethylene amine and deionized water,using CuCl·22H2O,Zn（Ac）·22H2O and SnCl·45H2O as metal precursor and thiourea as sulfur source.The effects of the ratio of ethylene amine and deionized water on crystal structure,composition,morphology and absorption spectra of particles were analyzed by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,raman spectroscopy,transmission electron microscopy（TEM）,Energy Dispersive X-Ray Spectroscopy（EDS）and UV-Vis spectroscopy.The results revealed that the phase structure of particles can be converted from the kesterite to metastable orthorhombic CZTS and the morphology,atomic ratios,optical band-gap of CZTS has occurred a certain change with different ratios of ethylene amine and deionized water.When the ratio of ethylene amine and deionized water in the system was 1∶1,pure metastable orthorhombic phase and shape of irregular cube CZTS particles were obtained,the atomic ratios of Cu∶Zn∶Sn∶S was 1.7∶1.1∶1∶4,the band gap of the CZTS was about 1.53 eV,which approached the optimum value for solar photoelectric conversion.Finally,kesterite CZTS can be converted from the metastable orthorhombic CZTS particles annealing at 450℃for 1hunder an S-vapour atmosphere.

关 键 词：无机非金属材料 亚稳态正交相 水热法 Cu2ZnSnS4 相转变 

分 类 号：O611.4[理学—无机化学]