Fig. 3. Variation in ZnO:B morphology as a function of d–w treatment time. (a) 2 mm height profiles, (b) height distributions extracted from 2 Â 2 mm2 AFM images of 1.65 mm ZnO layers with 0, 20 s and 80 s d–w treatment length, 9 interruptions, B2H6/DEZ ¼1.1 Á 10 À 3. Profiles are shifted vertically to improve readability.