Organic Photoelectric Conversion Element High Tg Intermediate Layer
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Solution Overview
Problem
Organic photoelectric conversion devices deteriorate at high temperatures due to thermally unstable materials, and existing solutions either limit material choices or do not effectively prevent performance degradation during the formation of color filters.
Innovation Solution
Incorporating an intermediate layer with a glass transition temperature (Tg) of 200° C or higher between the photoelectric conversion layer and the charge blocking layer, made of organic compounds like those with a tert-butyl group, to prevent deterioration and maintain performance at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an organic photoelectric conversion device is subjected to high temperature heat treatment (200°C or higher) during fabrication, then color filters and other components can be formed, but the organic photoelectric conversion layer deteriorates and performance degrades
Solution Approach 1:
The patent introduces a protective organic layer as an intermediary between the heat source and the photoelectric conversion layer. This protective layer has a glass transition temperature of 200°C or higher, allowing it to withstand the high temperature heat treatment (200°C or higher) required for color filter formation without deteriorating. The protective layer shields the underlying photoelectric conversion layer from thermal damage, enabling the device to undergo necessary manufacturing heat treatment while maintaining performance stability.
2Reliability
If the glass transition temperature of the organic layer is increased to 200°C or higher to prevent heat deterioration, then heat resistance is improved, but the range of material choices is narrowed
Solution Approach 1:
The patent divides the organic structure into functionally distinct layers: a photoelectric conversion layer that can use a wide range of organic materials (including those with lower glass transition temperatures) and a separate protective layer with high glass transition temperature (200°C or higher). This segmentation allows each layer to be optimized independently - the photoelectric conversion layer for optimal photoelectric performance and the protective layer for thermal stability - thereby maintaining broad material selection freedom while achieving the required heat resistance.
3Reliability
If existing anti-deterioration methods are used, then some protection is provided during annealing, but the protection is lost after the anti-deterioration layer is removed
Solution Approach 1:
The protective organic layer is designed to be an integral, permanent component of the device structure that serves itself as the ongoing protection mechanism. Unlike temporary anti-deterioration layers that are removed after use, this protective layer remains in place throughout the device's operational life, continuously protecting the photoelectric conversion layer from thermal damage during both manufacturing and operation. The layer's high glass transition temperature (200°C or higher) enables it to withstand repeated high temperature exposures without deteriorating or needing replacement.
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 intermediate layer with a Tg of 200° C or higher effectively protects the photoelectric conversion and charge blocking layers from high-temperature degradation, allowing for a wider range of material choices and improved heat resistance without compromising carrier transport performance.
Implementation Method 1
The intermediate layer includes an organic compound disposed between the photoelectric conversion layer and the charge blocking layer and having a glass transition temperature of 200° C. or higher
Data Source
AI summary
A photoelectric conversion element includes a pair of electrodes, a photoelectric conversion layer, a charge blocking layer, an intermediate layer. The photoelectric conversion layer contains an organic material between the electrodes. The charge blocking layer is disposed between the photoelectric conversion layer and one of the electrodes. The intermediate layer includes an organic compound disposed between the photoelectric conversion layer and the charge blocking layer and having a glass transition temperature of 200° C. or higher.