Fig. 4: Lateral distribution of rubidium, indium and gallium. | Nature Energy

Fig. 4: Lateral distribution of rubidium, indium and gallium.

From: High-concentration silver alloying and steep back-contact gallium grading enabling copper indium gallium selenide solar cell with 23.6% efficiency

Fig. 4

Elemental distribution of Rb, In and Ga (top view) at four different positions of the bare ACIGS absorber film (after removal of the window and buffer layers via an HCl etch), as obtained from nano-XRF analysis. Thickness differences were again corrected by using the intensity variations in the respective Se maps. The colour code refers to the density (in ng cm−2), ranging from the corresponding minimum (Min) to the maximum (Max) values.

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