Fig. 4From: Fermi Level Tuning of ZnO Films Through Supercycled Atomic Layer Deposition a–e Two-dimensional contact potential difference V CPD images of the surface potential measurements of the supercycled ALD-grown ZnO films with O2 plasma time (t 3) varying from 0 to 8 s and fixed thermal cycle (m = 1). f Average V CPD values with varying O2 plasma times (solid dots) and thermal cycles (open dots)Back to article page