Dummy Insertion Method

An integrated circuit (IC) device according to the present disclosure includes a substrate including a first surface and a second surface opposing the first surface, a redistribution layer disposed over the first surface and including a conductive feature, a passivation structure disposed over the redistribution layer, a metal-insulator-metal (MIM) capacitor embedded in the passivation structure, a dummy MIM feature embedded in the passivation structure and including an opening, a top contact pad over the passivation structure, a contact via extending between the conductive feature and the top contact pad, and a through via extending through the passivation structure and the substrate. The dummy MIM feature is spaced away from the MIM capacitor and the through via extends through the opening of the dummy MIM feature without contacting the dummy MIM feature.