Asymmetric Organic Compound for Blocking Layer in Image Sensors
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Solution Overview
Problem
Conventional hole blocking layers and electron blocking layers in organic photoelectric conversion elements are susceptible to improvement in preventing leak current, maintaining transparency to visible light, and suppressing dark current.
Innovation Solution
A novel compound represented by formula (1) is introduced, which has no axis of symmetry in its molecular structure. This compound is used in the photoelectric conversion element, specifically in the auxiliary layers, to enhance the blocking of holes and electrons, thereby reducing leak current and improving transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hole blocking layers and electron blocking layers are used, then leak current can be controlled, but transparency to visible light and suppression of dark current are insufficient
Solution Approach 1:
The patent employs asymmetric molecular structures in the blocking layer materials, specifically using compounds with chiral centers and asymmetric substitution patterns. This asymmetry in molecular geometry creates more effective charge blocking while maintaining optical transparency, resolving the contradiction between leak current suppression and dark current reduction.
Solution Approach 2:
The patent modifies key parameters of the blocking layer materials including HOMO-LUMO energy levels, molecular weight, and substituent groups. By adjusting these parameters, the material achieves optimal balance between electrical blocking capability and optical transparency, simultaneously improving leak current suppression and reducing dark current.
2Productivity
If blocking layers are added to control charge transfer, then photoelectric conversion efficiency improves, but device complexity increases
Solution Approach 1:
The patent designs blocking layer materials that simultaneously perform multiple functions: hole blocking, electron blocking, charge transport control, and optical transparency maintenance. This multi-functionality reduces the need for separate dedicated layers, thereby improving photoelectric conversion efficiency while limiting the increase in device complexity.
Solution Approach 2:
The patent combines the functions of hole blocking layer and electron blocking layer into integrated auxiliary layers that work synergistically. By merging these functions into coordinated layers with complementary properties, the device achieves enhanced photoelectric conversion efficiency without proportionally increasing complexity.
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 the novel compound effectively suppresses leak current in the dark, maintains high transparency to visible light, and enhances the photoelectric conversion efficiency of the solid-state imaging devices.
Implementation Method 1
This compound is used in the photoelectric conversion element, specifically in the auxiliary layers, to enhance the blocking of holes and electrons, thereby reducing leak current
Implementation Method 2
Techniques of converting visible light to electric signals by photoelectric conversion have heretofore been known and are widely used in, for example, image sensors
Data Source
AI summary
Provided is a compound represented by the following formula (1):wherein R1 to R6 are each independently a hydrogen atom, a halogen atom, a linear, branched or cyclic alkyl group, or the like.