Organic Photoelectric Conversion Layer With Charge Extraction Mediator
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Solution Overview
Problem
Organic sensors face challenges in maintaining sensitivity and control over photoelectric conversion properties due to unpredictable characteristics of organic materials, which are difficult to predict and integrate effectively with silicon photodiodes.
Innovation Solution
Incorporating a charge auxiliary layer with a mixture of metals and oxides, such as lanthanide elements and metalloids, between the electrode and the organic photoelectric conversion layer to enhance charge mobility and extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If organic materials are used to replace silicon in photodiodes to improve sensitivity and enable smaller pixel sizes, then the absorption area and sensitivity are improved, but the unpredictable characteristics and difficulty in controlling photoelectric conversion properties worsen
Solution Approach 1:
An inorganic charge auxiliary layer is introduced as an intermediary between the organic photoelectric conversion layer and the electrode. This layer mediates the charge extraction process, improving charge mobility and extraction efficiency while maintaining the unique optical properties of the organic photoelectric conversion layer, thus resolving the contradiction between sensitivity improvement and control difficulty
Solution Approach 2:
The device employs a composite structure combining inorganic charge auxiliary layer material with organic photoelectric conversion layer material. This composite approach leverages the high absorption coefficient and optical properties of organic materials while using inorganic materials to provide controlled charge transport and extraction, achieving both high sensitivity and reliable property control
2Productivity
If the pixel size is reduced to achieve higher resolution, then the integration density is improved, but the absorption area of the photodiode is reduced leading to deteriorated sensitivity
Solution Approach 1:
The charge auxiliary layer modifies the electrical parameters of the photodiode structure by improving charge mobility and extraction efficiency. This parameter change allows the photodiode to maintain high sensitivity despite the reduced absorption area caused by smaller pixel size, enabling higher integration density without sacrificing sensitivity
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
Improves charge extraction and reduces remaining charges, enhancing the photoelectric conversion efficiency and reducing image lag in organic sensors.
Implementation Method 1
improve charge mobility and extraction efficiency
Implementation Method 2
A photoelectric conversion device may receive incident light and convert the received incident light into an electrical signal
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2
AI summary
A photoelectric conversion device includes a first electrode (10) and a second electrode (20) facing each other, an organic photoelectric conversion layer (30) between the first electrode (10) and the second electrode (20), and a charge auxiliary layer (40) between the first electrode (10) and the organic photoelectric conversion layer (30). The organic photoelectric conversion layer (30) is configured to absorb light in at least a portion of a wavelength spectrum of incident light and to convert the absorbed light into an electrical signal. The charge auxiliary layer (40) includes a metal and an oxide. The oxide may be an oxide material that excludes silicon oxide such that the charge auxiliary layer does not include silicon oxide.