Imaging Element Amorphous Buffer Layers Stress Management
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Solution Overview
Problem
Existing imaging elements with crystalline transparent electrodes suffer from stress damage and complex formation processes due to inner stress, leading to characteristic deterioration and prolonged formation times.
Innovation Solution
A simplified structure incorporating a single amorphous organic buffer layer and a single amorphous inorganic buffer layer between the light receiving layer and the second electrode, reducing stress damage and simplifying the formation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a crystalline transparent electrode is used, then transparency is improved, but inner stress causes stress damage on the light receiving layer
Solution Approach 1:
The patent introduces a buffer layer as an intermediary between the crystalline transparent electrode and the light receiving layer. This buffer layer absorbs the inner stress from the crystalline electrode, preventing stress damage to the light receiving layer while allowing the crystalline electrode to maintain its high transparency.
Solution Approach 2:
The patent uses an amorphous transparent electrode as a simplified copy alternative to the complex multi-layer crystalline electrode structure. This amorphous electrode maintains the necessary transparency while inherently having lower inner stress, eliminating the need for complex buffer layer structures.
2Object-affected harmful factors
If a multi-layer stress buffer layer structure is used, then stress damage is reduced, but the forming process becomes complex and time-consuming
Solution Approach 1:
The patent merges the stress buffer function with the transparent electrode function into a single integrated layer. The buffer layer is designed to simultaneously provide stress relief and maintain transparency, eliminating the need for separate multi-layer structures and simplifying the overall device architecture.
Solution Approach 2:
The patent replaces the complex multi-layer crystalline electrode structure with a simpler amorphous electrode structure that achieves the same functional outcomes (transparency and stress management) through a single layer, significantly reducing fabrication complexity.
3Object-affected harmful factors
If a multi-layer stress buffer layer structure is used, then stress damage is reduced, but formation time is prolonged
Solution Approach 1:
The patent combines multiple functions (stress buffering and transparency) into a single layer, reducing the number of deposition steps required. This integration directly reduces the total formation time while maintaining effective stress management.
Solution Approach 2:
The amorphous electrode structure requires fewer fabrication steps compared to the multi-layer crystalline structure, thereby reducing the overall formation time while achieving comparable or superior stress management performance.
4Device complexity
If a simplified single-layer buffer structure is used, then formation process is simplified, but stress damage protection may be insufficient
Solution Approach 1:
The patent optimizes the buffer layer's material composition, thickness, and structural parameters to achieve effective stress management in a single layer. By carefully controlling these parameters, the simplified structure provides adequate stress protection without requiring multiple layers.
Solution Approach 2:
The patent employs composite material design in the buffer layer, combining materials with complementary properties to achieve both stress relief and transparency in a single integrated layer, maintaining protection effectiveness while simplifying the structure.
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 solution effectively minimizes stress damage to the light receiving layer, prevents characteristic deterioration, and shortens the formation time while maintaining high transparency and low internal compressive stress, improving quantum efficiency and reducing dark current generation.
Implementation Method 1
at least one stress buffer layer interposed between one of the pair of electrodes and the photoelectric conversion layer
Implementation Method 2
a light receiving layer (photoelectric conversion layer) is interposed between two electrodes
Data Source
AI summary
An imaging element includes a layered structural body formed of a first electrode, a light receiving layer formed on the first electrode, and a second electrode formed on the light receiving layer, and a single first buffer layer formed of an amorphous organic material and a single second buffer layer formed of an amorphous inorganic material are provided between the light receiving layer and the second electrode from the light receiving layer side.