Patent ID: 8872335

Claim:
A semiconductor package comprising: a first substrate; a second substrate over the first substrate; multiple connection elements between a planar surface of the first substrate and a planar surface of the second substrate for electrically connecting the first substrate with the second substrate; and a contracted polymer layer disposed between the first substrate and the second substrate which binds the first and second substrates together and holds the multiple connection elements in mechanical contact with one another to form solderless connections between the multiple connection element that electrically connect the first substrate with the second substrate, the contracted polymer layer being the sole means binding the first substrate to the second substrate, wherein the contracted polymer layer is contained between the first and second substrates and does not extend beyond the planar surface of the second substrate in a direction extending orthogonally from the planar surface of the first substrate toward the second substrate, and wherein a sidewall of the polymer layer protrudes from the first or second surface at an angle from 55 degrees to 120 degrees.