Laser-Patterned Metal Gate for High-Throughput MOS Transistors
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Solution Overview
Problem
There is a need for a low-cost, high-throughput process technology to manufacture GHz thin film transistors (TFTs) with reliable electrical characteristics, as existing methods are costly and time-consuming.
Innovation Solution
The method involves forming a layer of metal-containing material on a dielectric film, laser patterning a metal gate, and creating source and drain terminals in an inorganic semiconductor substrate adjacent to the metal gate, using techniques such as laser direct writing and printing of semiconductor inks to achieve high-resolution patterning and efficient manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional semiconductor processing methods are used to manufacture GHz TFTs, then reliable electrical characteristics can be achieved, but the manufacturing cost increases and throughput decreases
Solution Approach 1:
The patent replaces conventional photolithography and metal deposition processes with laser direct writing to pattern the metal gate. This substitution enables direct writing of gate patterns without requiring photomasks, thereby reducing manufacturing steps, cost, and time while maintaining the ability to produce narrow gate widths and self-aligned structures necessary for reliable GHz TFT operation
Solution Approach 2:
The patent utilizes laser parameters (wavelength, power, scanning speed) to control the melting and resolidification of metal material, enabling precise patterning of the gate structure. By adjusting these parameters, the process achieves both high resolution (narrow gate widths) and high throughput, resolving the contradiction between reliability and productivity
2Manufacturing precision
If conventional photolithography and metal deposition are used, then patterned metal gates can be formed, but the manufacturing cost and time increase significantly
Solution Approach 1:
The patent replaces the multi-step conventional process (photomask alignment, photolithography exposure, development, metal deposition, etching) with a single-step laser direct writing process. This eliminates the need for photomasks and multiple processing steps, dramatically reducing both the time required and the manufacturing cost while maintaining or improving patterning resolution
Solution Approach 2:
The patent deposits a blanket layer of metal-containing material before laser patterning. This preliminary action allows the laser to selectively remove or reshape the metal in the desired gate pattern without requiring complex mask alignment procedures, thereby reducing the overall manufacturing cycle time while achieving precise gate patterning
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the production of MOS transistors with improved electrical characteristics at a lower cost and higher throughput than conventional semiconductor processes, with the ability to form narrow channel widths and self-aligned terminals, suitable for GHz operations.
Implementation Method 1
laser patterning a metal gate from the metal-containing material layer
Implementation Method 2
laser patterning a metal gate from the metal-containing material layer
Data Source
AI summary
A MOS transistor with a laser-patterned metal gate, and methods for its manufacture. The method generally includes forming a layer of metal-containing material on a dielectric film, wherein the dielectric film is on an electrically functional substrate comprising an inorganic semiconductor; laser patterning a metal gate from the metal-containing material layer; and forming source and drain terminals in the inorganic semiconductor in locations adjacent to the metal gate. The transistor generally includes an electrically functional substrate; a dielectric film on at least portions of the electrically functional substrate; a laser patterned metal gate on the dielectric film; and source and drain terminals comprising a doped inorganic semiconductor layer adjacent to the metal gate. The present invention advantageously provides MOS thin film transistors having reliable electrical characteristics quickly, efficiently, and/or at a low cost by eliminating one or more conventional photolithographic steps.