Black Phosphorus 2D Heterostructure for Large-Area Sheet Fabrication
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Solution Overview
Problem
Existing methods for preparing large-area 2D black phosphorus (BP) materials are challenging due to difficulties in applying mechanical or chemical exfoliation processes.
Innovation Solution
A black phosphorus-two dimensional material complex is formed by coupling first and second 2D material layers with a black phosphorus sheet in between, using van der Waals forces, and manufacturing this complex by forming a black phosphorus precursor film between the 2D material layers and applying heat and pressure to convert it into a black phosphorus sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If mechanical or chemical exfoliation processes are used to prepare 2D black phosphorus, then the material can be obtained with semiconductor characteristics, but it is difficult to achieve large area production
Solution Approach 1:
The invention segments the manufacturing process into distinct stages: forming 2D material layers (graphene, h-BN, or TMDs) as encapsulating structures, placing black phosphorus precursor between them, and then converting the precursor to black phosphorus through heat and pressure. This segmentation allows each component to be optimized independently while achieving large-area production.
Solution Approach 2:
The invention performs preliminary actions by first forming the 2D material encapsulating layers and placing the black phosphorus precursor between them before converting the precursor to black phosphorus. This preliminary structuring enables controlled conversion and protects the final 2D BP material, facilitating large-area production that would be difficult with direct exfoliation methods.
2Reliability
If 2D material layers are used to encapsulate black phosphorus, then the material is protected from external environments, but the structural complexity increases
Solution Approach 1:
The invention uses thin 2D material films (graphene, h-BN, or TMDs) as encapsulating layers. These thin films provide effective protection against environmental degradation while maintaining structural simplicity and flexibility, avoiding the need for thick or complex protective structures.
Solution Approach 2:
The invention creates a composite structure where 2D material layers encapsulate the black phosphorus sheet. This composite approach combines the protective properties of 2D materials with the semiconductor characteristics of black phosphorus, achieving environmental protection without significantly increasing overall structural complexity.
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 method allows for the efficient production of large-area 2D BP materials, which are protected from external environments and exhibit semiconductor characteristics, high charge mobility, and a high on/off current ratio, making them suitable for various electronic devices.
Implementation Method 1
first and second two-dimensional material layers each having a two-dimensional crystal structure and being configured to be coupled to each other by van der Waals force
Implementation Method 2
applying heat and pressure to the black phosphorus precursor film to form a black phosphorus sheet having a two-dimensional crystal structure
Data Source
AI summary
Provided are a black phosphorus-two dimensional material complex and a method of manufacturing the black phosphorus-two dimensional material complex. The black phosphorus-two dimensional material complex includes: first and second two-dimensional material layers, which each have a two-dimensional crystal structure and are coupled to each other by van der Waals force; and a black phosphorus sheet which between the first and second two-dimensional material layers and having a two-dimensional crystal structure in which a plurality of phosphorus atoms are covalently bonded.