[Analysis Case] Evaluation of Interdiffusion Between Layers of CIGS Solar Cells Using SIMS
It is possible to achieve high-precision measurements that are not affected by surface irregularities.
In solar cells, surface roughness is utilized to effectively absorb sunlight. When conducting SIMS analysis, the surface roughness leads to a decrease in depth resolution. Measurements from the surface appear to show that elements like Cd, Zn, and O are diffusing into the CIGS layer due to the effects of surface roughness and knock-on (Figure 3), but measurements taken from the substrate side (back side) reveal that there is no significant diffusion of Cd, Zn, and O into the CIGS layer (Figure 4). In addition to interdiffusion, it is also possible to evaluate changes in the composition of the main components (Cu, In, Ga, Se) and the concentration distribution of impurities (B, Na, Fe).
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Applications/Examples of results
Analysis of solar cells.