Metal-2D Material Junction Structure for Low-Resistance Semiconductor Contacts
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Solution Overview
Problem
Semiconductor devices face challenges in reducing contact resistance at metal-semiconductor junctions due to the Schottky energy barrier, which existing methods have not adequately addressed.
Innovation Solution
Incorporating a two-dimensional (2D) material layer, such as intrinsic graphene or nanocrystalline graphene, between the metal and semiconductor layers to reduce contact resistance by eliminating interfacial layers and pinning phenomena, with the 2D material layer directly grown on a germanium-based second semiconductor layer to prevent the formation of unstable oxide layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a metal layer is directly contacted with a semiconductor layer to exchange electrical signals, then wiring conductivity is improved, but contact resistance increases due to Schottky energy barrier
Solution Approach 1:
A two-dimensional material layer is introduced as an intermediary between the metal layer and the semiconductor layer. This 2D material layer serves as a mediator that reduces the Schottky energy barrier at the metal-semiconductor junction, thereby reducing contact resistance while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent employs a composite structure consisting of metal layer + two-dimensional material layer + semiconductor layer. This composite junction structure combines the advantages of metal (high conductivity) and semiconductor (controlled electrical properties) while the 2D material layer provides optimal interface properties, achieving low contact resistance through material composition rather than structural complexity.
2Loss of energy
If various methods are used to lower Schottky energy barrier between semiconductor and metal, then contact resistance is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent changes the material parameter by selecting specific two-dimensional materials (such as graphene, transition metal dichalcogenides) with appropriate work functions and electronic properties. By adjusting the material composition and crystal structure of the 2D layer, the Schottky barrier height is optimized, achieving low contact resistance through material selection rather than complex fabrication processes.
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 configuration significantly decreases contact resistance by eliminating interfacial layers and enhancing electrical conductivity, as demonstrated by increased current characteristics in voltage-current measurements.
Implementation Method 1
contact resistance is generated due to the semiconductor/metal heterojunction. In order to reduce the contact resistance, various methods for lowering a Schottky energy barrier between a semiconductor and a metal have been proposed.
Implementation Method 2
a 2D material layer having a 2D crystal structure between a metal layer and a semiconductor layer
Data Source
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AI summary
A semiconductor device may include a first semiconductor layer including a first semiconductor material; a metal layer facing the first semiconductor layer and having conductivity; a 2D material layer between the first semiconductor layer and the metal layer; and a second semiconductor layer between the first semiconductor layer and the 2D material layer. The second semiconductor layer may include a second semiconductor material different from the first semiconductor material. The second semiconductor layer and the 2D material layer may be in direct contact with each other. The second semiconductor material may include germanium.