Patent ID: 9698281
Date: 2017-07-04
CPC Classifications: G01J,H01L

Claim:
1. A method of manufacturing a semiconductor device comprising: depositing a plurality of reflector metallization layers and a plurality of oxide layers in an alternating pattern over a reflector region of a substrate during a complementary metal-oxide-semiconductor (CMOS) process such that each of the reflector metallization layers extend over the reflector region at a different level above the reflector region, the reflector metallization layers being patterned to form contact structures, the contact structures at the different levels being aligned vertically with respect to each other; forming vias that extend through the oxide layers and electrically connect the contact structures to form pillar structures; depositing an absorber layer on top of the plurality of reflector metallization layers, the plurality of oxide layers and the pillar structures such that the absorber layer is electrically connected to the pillar structures; and after depositing the absorber layer, removing portions of the oxide layers beneath the absorber layer and around the pillar structures down to a topmost reflector metallization layer of the plurality of the reflector metallization layers to form a gap over which a portion of the absorber layer is suspended by the pillar structures, the topmost reflector metallization layer being exposed in the gap, wherein depositing the plurality of reflector metallization layers and the plurality of oxide layers further comprises: depositing a first oxide layer of the plurality of oxide layers on the substrate; depositing a first reflector metallization layer of the plurality of reflector metallization layers on top of the first oxide layer; forming a second oxide layer of the plurality of oxide layers on top of the first reflector metallization layer; forming second vias in the second oxide layer that extend down to the first reflector metallization layer; depositing a second reflector metallization layer of the plurality of reflector metallization layers on top of the second oxide layer and the second vias; patterning the second reflector metallization layer by removing portions of the second reflector metallization layer around the second vias; forming a third oxide layer of the plurality of oxide layers on top of the second reflector metallization layer; depositing the absorber layer on top of the third oxide layer; removing a portion of the third oxide layer beneath the absorber layer down to the second reflector metallization layer and portions of the second oxide layer between the second vias down to the first reflector metallization layer to form the gap with the portion of the absorber layer suspended over the qap and the first and second reflector metallization layers exposed below the absorber layer to form a patterned reflector structure, wherein the pillar structures include the vias and the second vias, wherein the removal of the portion of the third oxide layer and the portions of the second oxide layer is carried out such that the first oxide layer is not exposed in the gap between the pillar structures.