Photoelectric Conversion Element Active Layer Crystallinity
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Solution Overview
Problem
Existing methods for manufacturing photoelectric conversion elements result in active layers with low sensitivity for the photoelectric effect.
Innovation Solution
A method involving the formation of an active layer using polyamic acid as a precursor, with specific heating steps at 120° C. for 20-60 minutes and at 230° C. to 280° C. for 10 minutes, to enhance crystallinity and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyamic acid is heat-treated at 300°C for 2 hours to produce crystallized polyimide active layer, then the active layer exhibits photoelectric effect, but the sensitivity of the photoelectric effect is low
Solution Approach 1:
The patent changes the heating parameters from 300°C for 2 hours to a two-stage process: first heating at 120°C for 20-60 minutes, then heating at 230°C to 280°C for 10 minutes. This parameter optimization achieves both high crystallinity and high photoelectric sensitivity while reducing total heating time to 30-70 minutes.
Solution Approach 2:
The patent segments the single long heating process into two distinct heating stages. The first stage at 120°C initiates crystallization, and the second stage at 230°C to 280°C completes the crystallization and enhances photoelectric sensitivity. This segmentation allows each stage to perform its specific function efficiently.
2Reliability
If polyamic acid is heat-treated at 300°C for 2 hours to produce crystallized polyimide active layer, then the active layer exhibits photoelectric effect, but the manufacturing efficiency is reduced
Solution Approach 1:
The patent optimizes heating parameters to reduce total processing time from 2 hours to 30-70 minutes while maintaining or improving photoelectric conversion performance. The two-stage heating process achieves high crystallinity and sensitivity more efficiently than conventional single-stage heating.
Solution Approach 2:
By dividing the heating process into two stages with different temperature ranges and durations, the patent achieves efficient manufacturing. The first stage prepares the structure for crystallization, and the second stage completes it rapidly, improving overall manufacturing efficiency.
3Reliability
If the active layer is heated at high temperature for long duration to improve crystallinity, then photoelectric sensitivity improves, but the heat-resistant temperature requirement becomes more challenging
Solution Approach 1:
The patent changes the heating profile from a single high-temperature long-duration process to a two-stage process with moderate then high temperature. This achieves high crystallinity and sensitivity while the final polyimide structure maintains heat resistance up to 300°C or higher.
Solution Approach 2:
The first heating stage at 120°C performs preliminary crystallization preparation, creating a structure that can be rapidly completed in the second stage. This preliminary action reduces the burden on the second stage, allowing shorter high-temperature exposure while achieving the desired crystallinity.
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 proposed method significantly improves the crystallinity and sensitivity of the active layer, leading to enhanced photoelectric conversion performance and a higher heat-resistant temperature.
Implementation Method 1
a first heating step of heating the first layer at 120° C. for 20 minutes to 60 minutes
Implementation Method 2
a second heating step of heating the first layer at 230° C. to 280° C. for 10 minutes
Implementation Method 3
the active layer has high sensitivity of the photoelectric effect
Data Source
AI summary
A method for manufacturing a photoelectric conversion element according to an aspect includes an active layer forming step of forming an active layer having a repeating unit represented by Chemical Formula 1. The active layer forming step includes: a first layer forming step of forming a first layer by applying polyamic acid serving as a precursor; a first heating step of heating the first layer at 120° C. for 20 minutes to 60 minutes; and a second heating step of heating the first layer at 230° C. to 280° C. for 10 minutes.