Photoelectric Conversion Active Layer Heating for Higher Sensitivity
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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 for manufacturing a photoelectric conversion element involving the formation of an active layer with specific repeating units, achieved through a series of heating steps applied to a polyamic acid precursor, optimizing the crystallization and photoelectric properties of the polyimide layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyamic acid is heat-treated at 300°C for 2 hours to produce crystallized polyimide 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 temperature parameters from the conventional 300°C to a lower range of 180-280°C, and adjusts the heating time from 2 hours to a shorter duration of 10 minutes. This parameter optimization achieves crystallized polyimide formation with high photoelectric sensitivity while reducing energy consumption and processing time
Solution Approach 2:
The patent applies a preliminary low-temperature heating step at 120°C for 20-60 minutes before the main high-temperature heating. This preliminary action prepares the polyamic acid structure for subsequent crystallization, enabling the final heating step to achieve optimal photoelectric sensitivity more efficiently
2Reliability
If polyamic acid is heat-treated at high temperature for long duration to achieve crystallization, then photoelectric effect is achieved, but manufacturing efficiency is reduced
Solution Approach 1:
The patent optimizes the heating parameters by reducing the temperature from 300°C to 180-280°C and shortening the duration from 2 hours to 10 minutes. This parameter change maintains crystallization quality while significantly improving manufacturing efficiency and reducing energy consumption
Solution Approach 2:
The preliminary heating at 120°C for 20-60 minutes prepares the polyamic acid layer for rapid crystallization in the subsequent high-temperature step, enabling faster overall processing while ensuring high photoelectric conversion sensitivity
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 enhances the sensitivity of the photoelectric effect in the active layer, leading to improved performance in photoelectric conversion elements and optical sensors.
Implementation Method 1
polyamic acid serving as a precursor of polyimide is heat-treated at 300° C. for 2 hours in order to produce an active layer (polyimide layer) in which the polyimide crystallizes
Implementation Method 2
produce an active layer (polyimide layer) in which the polyimide crystallizes and exhibits a photoelectric effect
Implementation Method 3
the polyimide crystallizes and exhibits a 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.