Perovskite Radiation Detector Layer Stacking
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Solution Overview
Problem
The existing radiation detectors using perovskite materials for radiation absorption layers face challenges in mass producibility due to the limited thickness that can be achieved in a single step of spray coating, making them impractical for large-area detectors.
Innovation Solution
A radiation detector design incorporating a substrate with a charge collection electrode, a radiation absorption layer composed of perovskite structure particles and a binder resin, and a voltage application electrode, where the absorption layer can be thickened using the particle-in-binder method, potentially including inorganic semiconductor particles to enhance charge mobility and sensitivity, and a semiconductor charge collection layer to facilitate charge movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If spray coating method is used to form radiation absorption layer, then manufacturing simplicity is improved, but layer thickness is limited to several tens of nm which is insufficient for radiation absorption efficiency
Solution Approach 1:
The radiation absorption layer is constructed by stacking multiple perovskite particle layers, each formed by spray coating. This segmentation allows the total thickness to exceed the limitation of single-step spray coating (several tens of nm) while maintaining the manufacturing simplicity of the spray coating method. Each layer acts as an independent segment that contributes to the cumulative thickness required for efficient radiation absorption.
Solution Approach 2:
The invention transitions from a single-layer thickness constraint to a multi-layer stacked structure. By adding the dimension of layer stacking (vertical stacking in the thickness direction), the system overcomes the single-step spray coating thickness limitation while maintaining ease of manufacture through repeated application of the same coating process.
2Quantity of substance
If perovskite material is used for radiation absorption layer, then cost is reduced compared to CsI, a-Se, or CdTe, but charge mobility is insufficient for sufficient sensitivity and response characteristics
Solution Approach 1:
The radiation absorption layer is formed as a composite material consisting of perovskite particles dispersed in a binder resin. This composite structure combines the low-cost advantage of perovskite materials with the charge transport capabilities provided by the binder resin matrix, achieving both cost reduction and sufficient charge mobility for practical detector applications.
Solution Approach 2:
The binder resin acts as an intermediary medium that facilitates charge transport between perovskite particles. Since perovskite particles alone have insufficient charge mobility, the binder resin serves as a mediating phase that enables efficient charge collection while maintaining the cost benefits of using perovskite materials.
3Reliability
If radiation absorption layer thickness is increased to 100 μm or more for improved radiation absorption efficiency, then absorption efficiency is improved, but mass producibility deteriorates due to inability to form thick layers in single spray coating step
Solution Approach 1:
The thick radiation absorption layer (100 μm or more) is segmented into multiple thinner sub-layers, each formable by spray coating. This segmentation enables the production of thick layers suitable for high radiation absorption efficiency while maintaining mass producibility through standardized, repeatable coating processes for each sub-layer.
Solution Approach 2:
The formation of the radiation absorption layer employs periodic action by repeating the spray coating process multiple times to build up the desired thickness. Each coating cycle deposits a thin layer, and through periodic repetition of this action, the cumulative thickness reaches 100 μm or more, achieving both high absorption efficiency and mass producibility.
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 configuration enables the production of radiation detectors with improved mass producibility and sensitivity by allowing for thicker radiation absorption layers and efficient charge collection, addressing the limitations of spray coating methods.
Implementation Method 1
a radiation absorption layer disposed on one side with respect to the substrate and including perovskite structure particles and a binder resin
Implementation Method 2
a voltage application electrode disposed on the one side with respect to the radiation absorption layer, a bias voltage being applied to the voltage application electrode so that a potential difference is generated between the voltage application electrode and the charge collection electrode
Data Source
AI summary
A radiation detector includes a substrate including a charge collection electrode, a radiation absorption layer disposed on one side with respect to the substrate and including perovskite structure particles and a binder resin; and a voltage application electrode disposed on the one side with respect to the radiation absorption layer, a bias voltage being applied to the voltage application electrode so that a potential difference is generated between the voltage application electrode and the charge collection electrode.