Tailoring the Hydrogen Diffusion in Polycrystalline WO₃ Thin Films by a p-n Heterojunction.

ABSTRACT: This study examines the lateral diffusion of hydrogen in tungsten trioxide (WO₃) thin films with a nickel oxide (NiO) top layer. It focuses on the impact of the depletion region formed at the NiO/WO₃ p-n heterojunction on the diffusion process. This depletion region influences diffusion by acting as a barrier to hydrogen movement. It effectively reduces the thickness in WO₃ available for diffusion and increases the diffusion velocity due to the interplay with the concentration-dependent diffusion coefficient in polycrystalline WO₃. Our in situ measurement technique allows for the detailed study of lateral hydrogen diffusion by inducing a concentration gradient in the layer plane. This method demonstrates by a direct comparison that diffusion is f

SUBMITTER: Hecker TK 

PROVIDER: S-EPMC12536499 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature