OMHH X-Ray Detector Materials for Lightweight Direct Imaging
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Solution Overview
Problem
Conventional direct X-ray detectors based on inorganic semiconductors like silicon and selenium face issues such as high cost, bulkiness, temperature sensitivity, radiation damage, and energy dependency, limiting their adoption and performance in various applications.
Innovation Solution
Development of direct X-ray detectors using zero-dimensional organic metal halide hybrids (OMHHs) that incorporate metal halides as X-ray absorbers and organic semiconducting components as charge transporters, processed via solution-based methods at low temperatures, enabling high sensitivity, fast response times, and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic semiconductors (silicon and selenium) are used for direct X-ray detectors, then detector performance and image quality are achieved, but manufacturing cost and device weight increase significantly
Solution Approach 1:
The patent changes the material composition parameters by using organic metal halide hybrids with specific molecular structures (containing heavy atoms like Pb, Sn, or Bi) to achieve high X-ray absorption coefficients without requiring the bulk and weight of traditional inorganic semiconductors. This parameter change in material composition enables lightweight detectors while maintaining detection performance.
Solution Approach 2:
The patent employs composite organic metal halide hybrid materials that combine organic semiconducting components with metal halide species. This composite structure integrates the advantages of both organic materials (lightweight, flexible) and metal halides (high X-ray absorption), resolving the contradiction between performance and weight.
2Reliability
If inorganic semiconductors are used for direct X-ray detectors, then X-ray detection capability is achieved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent adopts organic metal halide hybrids that can be synthesized from abundant, low-cost precursors through simple solution processing. These materials replace expensive inorganic semiconductors like selenium and silicon, enabling cost-effective detector manufacturing while maintaining detection capability through the high atomic number elements present in the hybrid structure.
Solution Approach 2:
The patent changes the manufacturing process parameters from complex high-temperature semiconductor fabrication to simple solution-based processing at low temperatures. This parameter change in synthesis methodology dramatically reduces manufacturing cost and complexity while preserving X-ray detection functionality.
3Measurement precision
If inorganic semiconductors are used for direct X-ray detectors, then detection sensitivity is achieved, but temperature sensitivity and radiation damage occur
Solution Approach 1:
The patent uses organic metal halide hybrids with molecular structures designed for radiation hardness. The organic components can be engineered to resist radiation-induced degradation, while the metal halide species provide stable X-ray absorption. This material selection resolves the reliability issue under radiation exposure while maintaining detection sensitivity.
Solution Approach 2:
The patent changes the operational temperature parameters by using materials that are stable at room temperature and do not require temperature-controlled environments. The organic metal halide hybrids maintain their structural integrity and detection performance across a wide temperature range, eliminating the temperature sensitivity problem of conventional inorganic detectors.
4Reliability
If conventional inorganic semiconductors are used, then direct X-ray conversion is achieved, but response time and image acquisition speed are limited
Solution Approach 1:
The patent changes the charge transport parameters by incorporating organic semiconducting components with high carrier mobility into the hybrid structure. These organic components facilitate rapid charge carrier extraction and transport, significantly improving response time while maintaining direct X-ray conversion capability through the metal halide species.
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
The OMHH-based detectors offer enhanced sensitivity, rapid image acquisition, tunable properties, lightweight and flexible design, low-cost fabrication, and environmental friendliness, making them suitable for diverse imaging applications.
Implementation Method 1
metal halide species as X-ray absorber
Implementation Method 2
organic semiconducting components as charge transporter
Data Source
AI summary
Disclosed herein are direct X-ray detectors based on organic metal halide hybrids (OMHHs). For example, described herein are direct X-ray detectors including an organic metal halide hybrid (OMHH) material and a first and a second electrode. In some examples, the OMHH has a composition of RkMlXm, wherein R is a semiconducting organic cation, M is a metal chosen from Zn, Cu, Mn, Pb, Sn, Sb, and Bi, and X is a halide chosen from Cl, Br, I, and combinations thereof, and wherein k, l, and m are integers.