Patent ID: 9117914
Filing Date: 2015-08-25
Classification: H01L

Abstract:
1. A thin film transistor structure comprising: a substrate; a polymeric material post on the substrate, the post having a height dimension extending away from the substrate to a top, the post having an edge along the height dimension; an inorganic material cap on the top of the post, the cap covering the top of the post, the cap extending beyond the edge of the post to define a reentrant profile; a conformal conductive material gate layer over the edge of the post in the reentrant profile; a conformal insulating material layer on the gate layer in the reentrant profile; a conformal semiconductor material layer on the insulating material layer in the reentrant profile; a first electrode located in contact with a first portion of the semiconductor layer over the cap; a second electrode located in contact with a second portion of the semiconductor layer over the substrate and not over the post, and adjacent to the edge of the post in the reentrant profile such that a distance between the first electrode and second electrode is greater than zero when measured orthogonally to the substrate surface, the first electrode and the second electrode defining a transistor having a channel in the semiconductor layer between the first electrode and the second electrode.