US Patent 9812429 Interconnect structures for assembly of multi-layer semiconductor devices

A multi-layer semiconductor device includes a first semiconductor structure having first and second opposing surfaces, the second surface of the first semiconductor structure having at least a first semiconductor package pitch. The multi-layer semiconductor device also includes a second semiconductor structure having first and second opposing surfaces, the first surface of the second semiconductor structure having a second semiconductor package pitch. The multi-layer semiconductor device additionally includes a third semiconductor structure having first and second opposing surfaces, the first surface of the third semiconductor structure having a third semiconductor package pitch which is different from at least the second semiconductor package pitch. The second and third semiconductor structures are provided on a same package level of the multi-layer semiconductor device. A corresponding method for fabricating a multi-layer semiconductor device is also provided.