Microwave Transistor Patterned Gate Structure Suppresses Short-Channel Effect
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Solution Overview
Problem
Current microwave transistor technologies face limitations in output power and frequency performance due to the short-channel effect, which is exacerbated by the thinning of the barrier layer and the resulting decrease in 2D electronic gas density, and existing methods to address this either compromise conducting capacity or require complex epitaxy techniques.
Innovation Solution
A microwave transistor with a patterned gate structure featuring grooves in the barrier layer under the gate electrode, allowing the gate electrode to cover the grooves completely, enhancing control over the 2D electronic gas channel while maintaining the original heterostructure and conducting capacity, achieved through a manufacturing process involving etching and metal deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the barrier layer is thinned to enhance gate controllability and inhibit short-channel effect, then gate control over 2D electronic gas channel is improved, but density of 2D electronic gas in the conducting channel decreases, limiting maximum output power
Solution Approach 1:
The patent applies local quality by creating a patterned gate structure where the gate electrode is selectively positioned over specific regions of the barrier layer. The gate covers only portions of the barrier layer rather than the entire width, creating zones of different electrical characteristics under the gate electrode and between them. This allows enhanced gate control in covered regions while preserving high 2D electronic gas density in uncovered regions, thus resolving the contradiction between gate controllability and output power.
2Ease of operation
If the conducting region under the electrode is removed to achieve 3D gate control over the conducting channel, then modulation capability over the channel is increased, but conducting capacity and output power of the device are reduced
Solution Approach 1:
The patent applies segmentation by dividing the gate electrode into multiple discrete segments or fingers that are spaced apart rather than forming a continuous structure. This segmented configuration enables the gate to exert control over the channel in a distributed manner, achieving effective modulation capability. Simultaneously, the spaces between gate segments preserve conducting regions that maintain high 2D electronic gas density, thus preserving output power and conducting capacity.
3Reliability
If a back barrier layer with different component is grown to strengthen binding of 2D electronic gas and inhibit short channel effect, then short channel effect is inhibited, but extremely high requirements on epitaxy technique are imposed due to different growth temperatures of different semiconductor crystal materials
Solution Approach 1:
The patent applies the taking out principle by removing the complex back barrier layer epitaxy process entirely. Instead of growing a specially composited back barrier layer with different semiconductor materials requiring complex temperature switching, the invention achieves short-channel effect inhibition through the simplified patterned gate electrode structure on top of the existing barrier layer, thus eliminating the need for complex multi-material epitaxy while maintaining the desired electrical characteristics.
Data Source
AI summary
A microwave transistor has a patterned region between a source and a drain on a barrier layer. Within the patterned region, the surface of the barrier layer partially recessed downwards in the thickness direction to form a plurality of grooves. A gate covers the patterned region. The length of the gate is greater than the lengths of the grooves in the length direction of the gate, so as to completely cover the grooves. In one aspect, by arranging the grooves, the gate control capability of a component is improved and the short-channel effect is suppressed; in another aspect, an original heterostructure below the gate is preserved; in this way, the reduction of the conductive capability due to the reduction of the two-dimensional electron gas density is avoided; and accordingly the current output capability of the component is ensured while the short-channel effect is suppressed.