表面能对多晶FeS2薄膜晶体择优取向的影响

FeS2 thin films were prepared by sulfurizing Fe films at different temperatures. The crystal structure, degree of preferred orientation and surface energy were determined and calculated. There exist more obvious preferred orientation and higher surface energy in the FeS2 films formed at lower sulfuration temperatures. The degree of preferred orientation and surface energy decrease with the increase in sulfuration temperature. There hardly is preferred orientation in the FeS2 films with low surface energy because low surface energy shows an insignificant effect to restrict the orientation of crystal growth. However, high surface energy in the FeS2 films can strongly control the crystal growth and results in significantly preferred orientation because the nucleation and growth of FeS2 crystallites have to take the orientation as far as possible to reduce the surface energy.