SEM Image Analysis of WO3 Thin Films with Varying Thicknesses

Figure 5-1 presents Scanning Electron Microscopy (SEM) images of Tungsten Oxide (WO3) thin films deposited on Fluorine-doped Tin Oxide (FTO) substrates. The images showcase the surface morphology and cross-sectional structure of the films at different thicknesses.

Surface Morphology:

(a) and (b): WO3-0.5 - These images display the surface of WO3 films with a thickness of 0.5 nm.* (c) and (d): WO3-2.5 - These images depict the surface of WO3 films with a thickness of 2.5 nm.* (e) and (f): WO3-400nm - These images illustrate the surface of WO3 films with a thickness of 400 nm.

Cross-sectional Structure:

(g) and (h): Cross-section of WO3-2.5 on FTO - These images reveal the interface and layering of a 2.5 nm thick WO3 film on the FTO substrate.* (i): Cross-section of WO3-400nm on FTO - This image shows the interface and layering of a 400 nm thick WO3 film on the FTO substrate.

By analyzing these SEM images, researchers can gain valuable insights into the influence of film thickness on the structural properties of WO3 thin films. This information is crucial for optimizing the performance of WO3-based devices in various applications.