Phase transformation and disorder effect on optical and electrical properties of Zn3P2 thin films

► The electric and optical properties of amorphous and polycrystalline Zn3P2 thin films have been investigated. ► Zn3P2 films show tetragonal polycrystalline structure for films annealed at temperature ≥623 K for 2 h. ► The refractive index shows higher value for polycrystalline Zn3P2 films. ► The electrical resistivity decreases with ascending the annealing temperature due to decrease in degree of disorder.