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Vibration-based energy harvesting using piezoelectric circular diaphragms (PCDs) has drawn much attention in recent decades because of their compatibility with various operation modes. However, it has been revealed that their output distribution over the electrode surface is highly uneven, with less output generated around the edge. In this work, we present a possible structure of a PCD, which consists of a notched substrate (notched PCD), a PZT-5H disk, and an annular mass, in which the charge output around the edge of the PCD can be enhanced. Moreover, the difference in charge production between the outer region (the region with less charge) and the inner region (the region with high charge) is reduced so that the output distribution of the PCD is improved. In the notched-PCD, the perimeter region of the PCD is better utilized, which leads to a higher output power. Finite element analysis is performed in …