B. Soegijono, H. A. Notonegoro, I. Sugihartono, E. Budianto, and M. R. Iskandar, “Optical and Defect Properties in Nearly Stochiometry ZnO Film Coated on Si (111) by Ultrasonic Spray Pyrolysis Method”, AJAS, vol. 8, no. 4, Aug. 2020.