Benzotriazole Light-Conversion Compound for Stable PV Encapsulants
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Solution Overview
Problem
Conventional organic light conversion agents in photovoltaic devices suffer from poor stability and high water-vapor transmission rates, leading to reduced efficiency and shortened service life, especially in heterojunction solar cells.
Innovation Solution
A benzotriazole organic compound with specific structural modifications is developed, which absorbs ultraviolet light and converts it into visible light, enhancing photovoltaic efficiency and stability by acting as a light conversion agent in photovoltaic encapsulant films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic light conversion agents are used to absorb ultraviolet light and convert it into visible light, then photovoltaic efficiency is improved, but stability deteriorates and water-vapor transmission rate increases
Solution Approach 1:
The patent modifies the molecular structure of conventional organic light conversion agents by introducing specific substituents (such as fluorine atoms, alkyl groups, or aryl groups) at defined positions of the benzotriazole core structure. These parameter changes in molecular composition and configuration enhance the compound's stability and reduce water-vapor transmission rate while preserving its ultraviolet absorption and visible light emission properties, thereby maintaining improved photovoltaic efficiency.
Solution Approach 2:
The patent develops composite wavelength conversion films by combining the modified benzotriazole organic light conversion agents with polymer matrix materials. This composite structure leverages the synergistic effects between the organic compound and polymer substrate, where the polymer provides structural stability and barrier properties while the benzotriazole derivative delivers efficient ultraviolet-to-visible light conversion, resolving the contradiction between efficiency improvement and stability maintenance.
2Productivity
If conventional organic light conversion agents are used, then ultraviolet light conversion to visible light is achieved, but service life is shortened due to high water-vapor transmission rates
Solution Approach 1:
The patent systematically modifies molecular parameters of the benzotriazole-based light conversion agents, including substituent types, positions, and configurations. These parameter changes are optimized to simultaneously achieve high light conversion efficiency and low water-vapor transmission rate, directly extending the service life of photovoltaic devices by preventing moisture ingress while maintaining effective ultraviolet light conversion functionality.
3Reliability
If encapsulating films with ultraviolet light absorption capabilities are used to improve stability, then service life is extended, but photovoltaic efficiency decreases seriously
Solution Approach 1:
The patent transforms the harmful ultraviolet light that would otherwise degrade the photovoltaic device into beneficial visible light through the wavelength conversion function of the modified benzotriazole compounds. By converting ultraviolet radiation (harmful factor) into visible light (beneficial for photovoltaic conversion), the invention simultaneously protects the device and enhances efficiency, resolving the contradiction between stability improvement and efficiency loss.
Solution Approach 2:
The modified benzotriazole organic compounds serve multiple functions simultaneously: they act as ultraviolet absorbers, visible light emitters, and stability enhancers. This multi-functionality eliminates the need for separate encapsulating films, as the light conversion agents themselves provide both protection and efficiency enhancement, resolving the trade-off between stability and photovoltaic performance.
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 benzotriazole organic compound improves photovoltaic efficiency by over 1% and extends device service life by more than 50% through effective ultraviolet light conversion and improved molecular stability.
Implementation Method 1
absorbs ultraviolet light
Implementation Method 2
converts it into visible light
Data Source
Figure 1~3
Figure 4~6
Figure 7~8d
AI summary
A benzotriazole organic compound, a preparation method thereof, and use thereof are provided. The benzotriazole organic compound has a structure represented by formula (1): wherein each Ar independently includes a substituted or unsubstituted aryl, or a substituted or unsubstituted heteroaryl; R1 and R2 are each independently selected from a substituted or unsubstituted alkyl group, or a substituted or unsubstituted alkoxy group; R3 and R4 are each independently selected from a halogen, a substituted or unsubstituted alkoxy group, or a substituted or unsubstituted alkylthio group; and R5 is selected from a substituted or unsubstituted alkyl group.