Pengaruh pelarut (Aquabidest, Aquabidest Etilen Glikol, Etilen glikol) pada struktur dan sifat optis lapisan zinc oxide zno dengan metode spin coating = Influence of different solvents (Aquabidest, Aquabidest Etilen Glikol, Etilen glikol) on the structural and optical properties of zinc oxide zno films with spin coating method