Halide Perovskite Radiation Detectors Material Availability
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Solution Overview
Problem
The high cost and limited availability of materials with suitable optical band gaps and high resistivity for room-temperature semiconducting X-ray and γ-ray detectors hinder their broad application, due to the scarcity of heavy element compounds and complex physics and chemistry of compound semiconductors, as well as issues like phase transitions and stoichiometric imbalances in existing detector materials.
Innovation Solution
The use of high purity, high quality single-crystals of inorganic semiconductor compounds with the formula A2P2X6, where A represents Pb or Sn and X represents S or Se, which absorb incident radiation and generate electron-hole pairs, allowing for effective detection of gamma and x-ray radiation with improved electrical resistivity and optical band gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heavy element compounds with suitable optical band gaps are used for radiation detectors, then detection performance is improved, but material availability and cost are worsened
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific compound class (Cs2AgInCl6 and related perovskite structures) with controlled stoichiometry and cation substitution, achieving the desired optical band gap (1.5-3.0 eV) and high resistivity while using abundant elements, thus resolving the contradiction between detection performance and material availability
Solution Approach 2:
The patent employs composite material strategies by creating mixed-cation and mixed-halide perovskites (combining Cs/Rb/Ma with I/Br/Cl) to tune optical and electrical properties, achieving both high detection performance through optimized band gap and resistivity while maintaining material availability through flexible compositional design
2Reliability
If compound semiconductors are used for radiation detectors, then optical band gap properties are improved, but physics and chemistry complexity increases
Solution Approach 1:
The patent simplifies the chemical system by focusing on halide perovskites with general formula ABX3, where A, B, and X can be independently tuned, providing a systematic framework that reduces the complexity of searching through diverse compound semiconductors while maintaining optimal optical band gap properties for radiation detection
3Reliability
If materials with attractive bulk physical properties are used, then detection capability is improved, but phase transitions occur hindering crystal growth
Solution Approach 1:
The patent stabilizes the perovskite phase by optimizing compositional parameters (cation sizes, halide ratios) to avoid phase transitions, and by controlling growth parameters (temperature gradients, cooling rates) to obtain high-quality single crystals without phase segregation, thus maintaining both detection capability and compositional stability
4Reliability
If commercial benchmark materials like CZT are used, then detector performance is achieved, but stoichiometric imbalance and phase precipitation occur
Solution Approach 1:
The patent achieves precise stoichiometric control in halide perovskites by optimizing synthesis parameters (temperature, pressure, atmosphere composition) and compositional ratios, preventing phase precipitation and maintaining the desired ABX3 structure, thereby achieving both detector performance and manufacturing precision
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
These compounds provide a cost-effective solution for detecting high energy radiation with improved electrical resistivity and optical properties, reducing the complexity of crystal growth and scale-up challenges, and offering enhanced mechanical hardness for easier detector fabrication.
Implementation Method 1
exposing a material comprising an inorganic compound having the formula A2P2X6... to incident gamma radiation, x-ray radiation... wherein the material absorbs the incident radiation and electron-hole pairs are generated in the material
Data Source
AI summary
Methods and devices for detecting incident radiation, such as incident x-rays or gamma-rays, are provided. The methods and devices use high purity, high quality single-crystals of inorganic semiconductor compounds having the formula A2P2X6, where A represents Pb or Sn and X represents S or Se, as photoelectric materials.