The phase and morphology of Cu2ZnSnSe4 nanopowders by hydrothermal method

Abstract

Quaternary compound Cu2ZnSnSe4 (CTZSe) which belonged to I2-II-IV-VI4 group, without rare elements, can be considered as the perfect material for absorbing layer in eco-friendly solar cells due to low cost and high efficiency. The CTZSe powders were synthesized by hydrothermal coreduction method from metal chlorides and SeO2 with reducing agent hydrazine hydrate at 160200°C. The phases of obtained products were analyzed by X-ray diffraction (XRD) and the size and morphology were observed by field emission scanning electron microscope (FESEM). Experimental results show that well crystallized Cu2ZnSnSe4 powders without Se impurities can be obtained by reacting at 200°C for 90 h. The three strong XRD peaks of these products are corresponding to (112), (204), and (312) crystal planes, respectively. The morphologies of these products mostly show irregular polygon flakes with about 3040 nm thickness and 50200 nm diameters.