Patent ID: 8173033

Claim:
A manufacturing method of a nano filter structure for breathing, and the nano filter structure comprising a plurality of top opening regions, a plurality of bottom opening regions, a plurality of sidewall gate regions and a plurality of support regions, and each sidewall gate region being disposed adjacent to a top opening region and a bottom opening region, and the support regions being disposed at an interaction of two sidewall gate regions, and the manufacturing method comprising the steps of: (B1) forming a patterned lifter layer on a substrate; (B2) forming a patterned first support layer on a portion of the lifter layer and a portion of the substrate, such that the bottom opening regions do not include the first support layer; (B3) forming a patterned first sacrificial layer on the bottom opening regions, the top opening regions and the sidewall gate regions; (B4) forming a patterned second support layer on the sidewall gate regions and the support regions; (B5) forming a second sacrificial layer on the top opening regions, the bottom opening regions, the sidewall gate regions and the support regions; (B6) forming a third support layer on the top opening regions, the bottom opening regions, the sidewall gate regions and the support regions; (B7) forming a protective layer on the top opening regions, the bottom opening regions, the sidewall gate regions and the support regions; (B8) etching the support regions and removing at least the third support layer to form a support groove in each support region; (B9) performing a side etch in the support grooves, and removing a portion of the sacrificial layers to form a plurality of support side-wing grooves; (B10) filling the support grooves and the support side-wing grooves to form a plurality of fillers; (B11) etching the top opening regions and the bottom opening regions, and removing at least the third support layer; (B12) forming a patterned first channel sacrificial layer in the top opening regions, the bottom opening regions, the sidewall gate regions and a portion of the support regions; (B13) forming a top gate layer in the bottom opening regions, the sidewall gate regions and the support regions; (B14) removing the lifter layer and all sacrificial layers; and (B15) removing the substrate; wherein each sacrificial layer so formed has a thickness smaller than or equal to 300 nm.