Abstract: A method includes epitaxially growing a Ge1-xSnx channel layer over a substrate. The Ge1-xSnx channel layer is in a metastable state. A Ge1-ySny barrier layer is epitaxially grown over the Ge1-xSnx channel layer to form a two-dimensional hole gas in the Ge1-xSnx channel layer. The Ge1-xSnx channel layer and the Ge1-ySny barrier layer are etched to form a first opening and a second opening in the Ge1-xSnx channel layer and the Ge1-ySny barrier layer. A first source/drain electrode and a second source/drain electrode are deposited in the first opening and the second opening, respectively. A gate electrode is formed over the Ge1-ySny barrier layer.

Abstract: A position touch screen panel using a unique pattern of arranging the resistive sensing circuit, in which the touch screen panel is formed by two substrates symmetrically overlapped, having four sensor lines extending along the periphery of the substrates and creating parallel connections to cover four corners, such that at least one pair of parallel connections in opposite corners (on diagonal corners) shall attain matching voltages, where the matching voltages shall be realized only if high voltage is measured from parallel connections at one corner; and low voltage is measured from parallel connections in an opposite corner; whereby voltage levels at corner points are defined relative to other corner points on one sensor line, not from comparison of two sensor lines. Using the above circuit arrangement, the touch screen panel is able to determine the touch position accurately.

Abstract: A position touch screen panel using a unique pattern of arranging the resistive sensing circuit, in which the touch screen panel is formed by two substrates symmetrically overlapped, having four sensor lines extending along the periphery of the substrates and creating parallel connections to cover four corners, such that at least one pair of parallel connections in opposite corners (on diagonal corners) shall attain matching voltages, where the matching voltages shall be realized only if high voltage is measured from parallel connections at one corner; and low voltage is measured from parallel connections in an opposite corner; whereby voltage levels at corner points are defined relative to other corner points on one sensor line, not from comparison of two sensor lines. Using the above circuit arrangement, the touch screen panel is able to determine the touch position accurately.