Remote Dopant Layer for Precise 2D FET Channel Doping
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Solution Overview
Problem
Conventional doping techniques for 2D materials in field-effect transistors (FETs) result in poor local control, material degradation, and decreased thermal stability, making it challenging to achieve precise p- and n-doping, which is essential for modern electronic devices.
Innovation Solution
The use of a remote dopant layer comprising boron-containing materials, such as boron nitride or boron carbide, which is electrically connected to the gate electrode or gate insulating layer to provide controlled and localized doping of the channel material, allowing for both p- and n-doping without compromising stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional doping techniques (ion implantation, chemical treatments, co-deposition) are used for 2D materials, then doping can be achieved, but local control is poor, material degradation occurs, and thermal stability decreases
Solution Approach 1:
The device is segmented into distinct functional layers: a 2D material channel layer and a separate remote dopant layer positioned adjacent to the gate electrode. This segmentation allows the dopant layer to provide doping functionality while the channel layer maintains its structural integrity and stability, resolving the contradiction between achieving precise doping and preserving material stability.
Solution Approach 2:
The remote dopant layer acts as an intermediary element that mediates the doping process. Instead of directly doping the 2D channel material (which causes degradation), the dopant layer is positioned remotely and provides controlled dopant diffusion or electric field effects, achieving precise doping control while protecting the channel material from direct exposure to harsh doping processes.
2Quantity of substance
If traditional doping methods are applied to 2D materials, then doping is achieved, but thermal stability is decreased
Solution Approach 1:
The dopant layer is pre-formed and positioned adjacent to the gate electrode before final device assembly and operation. This preliminary positioning allows for controlled dopant release or field effect activation at lower temperatures, avoiding the high-temperature processes that would degrade thermal stability while still achieving the desired doping concentration in the channel.
3Adaptability or versatility
If conventional doping techniques are used, then doping can be performed, but local control is poor
Solution Approach 1:
The remote dopant layer is positioned locally adjacent to the gate electrode, allowing for spatially selective doping control. By controlling the thickness, composition, and position of the dopant layer, different doping profiles and types (n-type or p-type) can be achieved in specific regions of the channel, providing both local control and flexibility in doping type selection.
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 precise control over the electrical properties of the channel layer, enhancing the performance and reliability of FETs by providing flexible manufacturing options and improved switching capabilities.
Implementation Method 1
charged defect states create a net charge in the remote dopant layer. This net charge creates an electric field which causes band bending in the channel material
Implementation Method 2
This net charge creates an electric field which causes band bending in the channel material, thereby controlling band alignment in the channel region
Data Source
AI summary
The technology of the present disclosure generally relates to the field of semiconductor devices. More particularly, it relates to a field-effect transistor (FET) and systems and methods for producing the same. The FET comprising: a substrate; at least one channel layer comprising a channel material; a source electrode and a drain electrode in electrical contact with the channel layer; at least one gate electrode in contact with a gate insulating layer; at least one remote dopant layer in electrical contact with at least a portion of the gate electrode or the gate insulating layer; wherein the remote dopant layer comprises at least one boron-containing material; and wherein the remote dopant layer is configured for remote doping of the channel material of the channel layer.