The present disclosure provides a method of creating a bond between a first object and a second object. For example, creating a joint or die attach between a semiconductor chip and an electronic substrate, especially for harsh and high temperature environments. The method may include a step of filling a space between the first object and the second object with a filler material. Further, the method may include a step of heating the filler material to facilitate formation of a plurality of inter-diffusion layers. Accordingly, a first inter-diffusion layer may be formed between the filler material and the first object. Further, a second inter-diffusion layer may be formed between the filler material and the second object. Furthermore, in some embodiments, the first inter-diffusion layer may be contiguous with the second inter-diffusion layer. The contiguity may be facilitated by placement of at least one insert between the first object and the second object, in which the inter-diffusion of the filler material and the at least one insert may produce the third inter-diffusion layer, wherein the third inter-diffusion layer is contiguous with each of the first inter-diffusion layer and the second inter-diffusion layer.

A package includes a carrier substrate, a first die, and a second die. The first die and the second die are stacked on the carrier substrate in sequential order. The first die includes a first bonding layer, a second bonding layer, and an alignment mark embedded in the first bonding layer. The second die includes a third bonding layer. A surface of the first bonding layer form a rear surface of the first die and a surface of the second bonding layer form an active surface of the first die. The rear surface of the first die is in physical contact with the carrier substrate. The active surface of the first die is in physical contact with the third bonding layer of the second die.