Figure -L shows CPD images of the Ag electrodes at the Ag/p-Si interface. In the sintering time of 5min (Figure ) and 10 min (Figure ), the distribution of CPD in the images was observed to be inhomogeneous. And then, the distribution of CPD gradually became homogeneous with the sintering time. At the sintering time of 30min, the CPD is the almost same at every measured points. Furthermore, there is no correlation between the CPD value and the surface roughness as shown from height and CPD profiles along the same line in each images. The surface-averaged CPD of each image is calculated and summarized in Table , where the surface-averaged CPD is found to decrease with sintering time. The decrease of CPD strongly implies that the electrical potential of the Ag electrodes at the interface intrinsically decreases.