My Ph.D. thesis focuses on the anodization of Nb to obtain Nb2O5 films. I conducted linear sweep voltammetry (LSV) using a UV light source and a shutter to analyze the photocurrent of the semiconductors. During "on/off" light experiments, I observed variations in photocurrent under different polarization potentials, as shown in the attached image. I noticed a sharp increase in the current just after turning on the light, followed by a transient decrease to a stable value upon turning off the light at specific polarization potentials and directions. However, at a more anodic potential, the sharp increase in photocurrent was not present; instead, a slow increase was observed within the potential step. I am seeking assistance in estimating the correct photocurrent in both situations. I have sketched in my attached figure a possible pathway to estimate the photocurrent in my figure, but I wonder if it is accurate. Could someone help me estimate these parameters?