Figure 14.

Relative signal of the photo peak for the two pixels under investigation: x = 0 indicates the center of pixel (86, 254), x = 75 indicates the center of pixel (87, 254), the black dashed line indicates the pixel boundary. The reduction of the induced signal due to the missing hole contribution, when the photons are absorbed close to the readout electrode, is clearly visible. For the white areas, no photo peak could be estimated reliably due to too much charge sharing. It is unclear whether the unsymmetrical behavior at the pixel boundary is due to a non-optimal alignment of the scan axis or due to variations of the effective pixel size in GaAs:Cr sensors (see following chapter).