In our case, no wrinkle of any kind was observed for undoped
film. A wrinkle network is seen in and ZnO:5% Al (Z5) and ZnO:10%
Al (Z10) films. Especially in the ZnO film image, the crystallite size
can be noticeable from the AFM image, but not seen in the other
doped samples. This decrease in crystallite size depending on the
aluminum doping is also seen from the SEM images. Also the wrinkle network disappeared in the ZnO:20% Al (Z20) film. Finally the
aluminum incorporation to ZnO film significantly affects the