Patent ID: 8896112

Claim:
A multi-chip module (MCM), comprising: a first substrate having a first surface, wherein the first substrate includes: first negative features disposed on the first surface, wherein a given first negative feature is recessed below the first surface and has a first opening, defined by a first edge; and a first layer disposed in the first negative features, wherein the first layer includes a hydrophilic material; positive features disposed on the first layer in the first negative features, wherein the positive features protrude above the first surface; and a second substrate having a second surface facing the first surface, wherein the second substrate includes second negative features disposed on the second surface, wherein a given second negative feature is recessed below the second surface and has a second opening, defined by a second edge; wherein the second negative features are coupled to the positive features so that the first substrate is mechanically coupled to the second substrate; and wherein the first substrate further comprises a second layer disposed in regions of the first surface surrounding the first negative features, wherein the second layer includes a hydrophobic material.