Infrared Sensor Compound with Dipole Moment for Low Illumination
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Solution Overview
Problem
Current infrared sensors lack effective compounds with excellent infrared absorption characteristics and deposition stability, limiting their performance in low illumination environments and biometric or security applications.
Innovation Solution
An infrared sensor incorporating a compound represented by Chemical Formula 1, which includes a divalent, trivalent, or tetravalent metal with specific substituents, exhibits improved infrared absorption and stability, featuring a permanent dipole moment, aspect ratio, and sublimation temperature, and is used in conjunction with a semiconductor substrate and auxiliary layers for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional infrared sensor materials are used, then the sensor structure is simple, but the infrared absorption characteristics and deposition stability are insufficient
Solution Approach 1:
The patent employs composite organic-infrared absorbing materials combining specific molecular structures (porphyrin, phthalocyanine, or naphthalocyanine cores with metal complexes) to achieve superior infrared absorption characteristics and deposition stability. The composite structure integrates the advantages of organic materials (tunability, low-temperature processing) with metal coordination chemistry (structural stability, controlled deposition), resolving the contradiction between reliability improvement and device complexity.
Solution Approach 2:
The patent systematically varies molecular parameters including metal center selection (divalent, trivalent, or tetravalent metals), substituent groups (R1a-R1e, R11-R32), and molecular weight control (≤900) to optimize infrared absorption and deposition properties. By changing these chemical parameters, the patent achieves enhanced reliability without requiring fundamentally new device architectures, thus managing complexity.
2Stability of the object's composition
If high molecular weight compounds are used to improve stability, then deposition stability improves, but the compound becomes less volatile and harder to deposit
Solution Approach 1:
The patent optimizes molecular weight as a critical parameter, setting it to 900 or less to balance volatility and stability. This parameter control ensures sufficient vapor pressure for effective deposition while maintaining compositional stability during the deposition process, directly resolving the contradiction between stability and manufacturability.
Solution Approach 2:
The patent introduces specific functional groups and substituent patterns (R1a-R1e, R11-R32) at localized positions within the molecular structure to enhance deposition stability without significantly increasing overall molecular weight. This localized structural optimization allows the compound to maintain volatility while achieving the required stability for reliable deposition.
3Measurement precision
If the sensor is optimized for infrared detection, then sensitivity in low illumination environments improves, but the device complexity increases due to additional layers and materials
Solution Approach 1:
The infrared photoelectric conversion layer uses a universal organic compound platform (porphyrin, phthalocyanine, or naphthalocyanine derivatives) that can detect various infrared wavelengths. This multi-functional approach allows a single layer design to handle different infrared detection requirements, improving sensitivity without proportionally increasing device complexity through multiple specialized layers.
Solution Approach 2:
The patent introduces auxiliary layers (hole transporting layer, electron transporting layer, hole blocking layer, electron blocking layer) as intermediary components that facilitate charge transport and prevent recombination. These intermediary layers enable high sensitivity in low-illumination conditions by optimizing charge carrier management, while their standardized designs minimize the overall complexity increase.
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 infrared sensor demonstrates improved light absorption and photoelectric conversion efficiency in the infrared wavelength region, offering enhanced sensitivity in low illumination environments and stability during deposition.
Implementation Method 1
an infrared photoelectric conversion layer between the first electrode and the second electrode, wherein the infrared photoelectric conversion layer includes a compound represented by Chemical Formula 1
Implementation Method 2
the compound represented by Chemical Formula 1 may have a permanent dipole moment of greater than or equal to about 1.2 Debye
Data Source
AI summary
Provided are a compound, an infrared sensor, a combination sensor, and an electronic device. The compound is represented by Chemical Formula 1. The infrared sensor includes a first electrode and a second electrode facing each other, and an infrared photoelectric conversion layer between the first electrode and the second electrode, wherein the infrared photoelectric conversion layer includes the compound represented by Chemical Formula 1.In Chemical Formula 1, the definition of each substituent is as described in the detailed description.