PREPARATION AND OPTICAL ANALYSIS OF COPPER SULPHIDE THIN FILM USING CHEMICAL BATH DEPOSITION METHOD. FJS [Internet]. 2022 Sep. 26 [cited 2025 Sep. 12];6(3):307 - 312. Available from: http://www.fjsadmin.fudutsinma.edu.ng/index.php/fjs/article/view/1079