Perovskite Radiation Detector Seeding Layer Growth
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Solution Overview
Problem
Current methods for producing thick layers of inorganic-organic halide Perovskite materials for radiation detectors are inefficient and costly, limiting their application in X-ray detection due to the difficulty in growing polycrystalline layers on substrates.
Innovation Solution
A method involving a seeding step with a second inorganic-organic halide Perovskite material, followed by growing the first material from a solution, allows for the formation of thick polycrystalline layers with moderate electric fields, using materials like methyl ammonium metal halides and formamidinium metal halides, and incorporating light emission materials for enhanced detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional methods (spin-coating, vapor deposition) are used to deposit Perovskite layers, then thin layers (around 300 nm) can be produced, but thick layers (above 10 μm) required for radiation detectors cannot be produced efficiently
Solution Approach 1:
The patent applies preliminary action by first depositing a thin Perovskite layer (seeding layer) on the substrate, which then serves as a template for subsequent thick layer growth. This preliminary layer enables the later formation of thick detector layers (above 10 μm) through solution-based growth methods, overcoming the thickness limitation of direct spin-coating or vapor deposition techniques.
2Reliability
If single crystal growth methods are used to produce thick Perovskite layers, then detector performance can be improved, but the production process becomes complex and costly
Solution Approach 1:
The patent applies parameter changes by transitioning from vacuum-based deposition methods to solution-based growth methods. This involves changing the chemical composition and processing parameters to enable thick layer formation through solution chemistry, thereby achieving both thick layers and simplified manufacturing without requiring complex single crystal growth equipment or processes.
Solution Approach 2:
The patent replaces mechanical/vacuum-based deposition systems with chemical solution-based growth systems. Instead of using complex vacuum deposition equipment or single crystal growth furnaces, the invention uses simple solution processing methods to grow thick Perovskite layers, thereby reducing device complexity while maintaining detector performance.
3Length of stationary object
If no seeding layer is used, then the production process can be simplified, but thick polycrystalline Perovskite layers cannot grow uniformly on substrates
Solution Approach 1:
The patent introduces a seeding layer as an intermediary between the substrate and the thick Perovskite detector layer. This intermediate layer serves as a nucleation template that enables uniform growth of thick polycrystalline Perovskite layers, solving the problem of non-uniform growth that would occur if thick layers were deposited directly on substrates without a seeding layer.
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 thick detector layers with high quantum efficiency, fast temporal response, and radiation resistance, suitable for direct and indirect detection, reducing production costs and improving detection capabilities.
Implementation Method 1
a seeding step of providing an seeding layer including a second inorganic-organic halide Perovskite material different from the first inorganic-organic halide Perovskite material, and a layer growth step of forming the detector layer by growing the first inorganic-organic halide Perovskite material from a solution on the seeding layer
Implementation Method 2
Scintillators are materials that absorb high energy radiation, such as α-, β, γ-rays, X-rays, neutrons or other high energetic particles, and convert that energy into bursts of visible photons
Data Source
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AI summary
The invention relates to a method for producing a radiation detector used to detect ionizing radiation including a first inorganic-organic halide Perovskite material (24) as a direct converter material and/or as a scintillator material in a detector layer and to a radiation detector comprising a detector layer (24) produced by means of the steps of the method. In order to provide an approach for producing a thick layer (e.g. above 10 μιη) of Perovskite material suitable for a radiation detector, it is proposed to grow the material selectively on a seeding layer (23), yielding in a thick polycrystalline layer. One suitable seeding layer (23) to grow lead Perovskite material is made of a bromide Perovskite material.