Organic Semiconductor Layer with Controlled Crystal Density
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Solution Overview
Problem
Existing semiconductor elements using organic semiconductors face challenges in achieving well-balanced photoelectric conversion and light-emitting characteristics, particularly in achieving high photoelectric conversion efficiency, dark-current characteristics, and afterimage characteristics, as well as efficient light emission at low voltages.
Innovation Solution
A semiconductor element and device are developed with an organic semiconductor layer using benzodithiophene or naphthodithiophene derivatives, which have specific molecular structures and crystal densities, allowing for moderate intermolecular interaction and improved carrier mobility, enabling the formation of a high-quality thin film with enhanced electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organic semiconductor is simply used in semiconductor elements, then the device can be fabricated with organic materials, but it is difficult to achieve well-balanced element characteristics (photoelectric conversion efficiency, dark-current characteristics, afterimage characteristics) at a high level
Solution Approach 1:
The patent applies parameter changes by precisely controlling the crystal density of the organic semiconductor material within a specific range (1.26-1.50 g/cm³) and limiting molecular weight to 1200 or less. These parameter optimizations enable the organic semiconductor to achieve balanced photoelectric conversion efficiency, dark-current characteristics, and afterimage characteristics without requiring complex device structures, thus resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The patent employs composite materials by selecting organic semiconductor materials that combine specific molecular structures (such as benzodithiophene or naphthodithiophene derivatives) with controlled crystal densities. This material composition approach allows achieving multiple performance requirements simultaneously while maintaining relatively simple device architecture, addressing the technical contradiction effectively.
2Power
If an organic semiconductor is used for light-emitting elements, then organic materials can be utilized, but it is difficult to achieve characteristics in which light is emitted at low voltage with high efficiency in a well-balanced manner
Solution Approach 1:
The patent achieves high light emission efficiency at low voltage by optimizing key parameters of the organic semiconductor: crystal density控制在1.26-1.50 g/cm³ range and molecular weight ≤1200. These parameter adjustments improve carrier mobility and reduce operating voltage without requiring complex device structures, thereby resolving the contradiction between power efficiency and device complexity.
3Reliability
If an organic semiconductor with high crystallinity is used, then charge transportability is improved, but aggregation occurs during thin film formation making it difficult to form high-quality films
Solution Approach 1:
The patent resolves this contradiction by changing the crystal density parameter to a specific range (1.26-1.50 g/cm³) and limiting molecular weight to 1200 or less. This optimization achieves moderate intermolecular interaction that provides sufficient charge transportability while preventing excessive aggregation during thin film formation, enabling high-quality film fabrication without sacrificing electrical performance.
4Manufacturing precision
If an organic semiconductor with low intermolecular interaction is used, then thin film formation is improved, but charge transportability deteriorates
Solution Approach 1:
The patent achieves the optimal balance by precisely controlling crystal density within 1.26-1.50 g/cm³ and molecular weight at 1200 or less. This parameter optimization creates moderate intermolecular interaction that ensures good thin film formation quality while maintaining sufficient charge transportability, effectively resolving the contradiction between manufacturing precision and reliability.
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 use of benzodithiophene or naphthodithiophene derivatives in the organic semiconductor layer improves external quantum efficiency and afterimage characteristics, facilitating the achievement of balanced element characteristics and efficient light emission at low voltages.
Implementation Method 1
the organic semiconductor material having a crystal density of greater than 1.26 g/cm3 and less than 1.50 g/cm3 in powder form by X-ray structure analysis, and a molecular weight of 1200 or less, and being available for vacuum deposition film formation
Data Source
AI summary
A first semiconductor element according to an embodiment of the present disclosure includes: a first electrode; a second electrode disposed to be opposed the first electrode; and an organic semiconductor layer that is provided between the first electrode and the second electrode, and including an organic semiconductor material, the organic semiconductor material having a crystal density of greater than 1.26 g/cm3 and less than 1.50 g/cm3 in powder form by X-ray structure analysis, and a molecular weight of 1200 or less, and being available for vacuum deposition film formation.