Gel Electrolyte Viscosity Control for Dye-Sensitized Solar Cells
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Solution Overview
Problem
Existing electrolyte solutions for dye-sensitized solar cells face issues with non-uniform injection, difficult sealing, solvent evaporation, flammability, and poor dye adsorption, leading to instability and low photoelectric conversion efficiency.
Innovation Solution
A method involving the use of solvents like gamma-butyrolactone (gBL), propylene carbonate (PC), or 3-methoxypropionitrile (MPN) mixed with polymers such as polyacrylonitrile (PAN), polyvinyl acetate (PVA), or poly(ethylene oxide) (PEO) to create an electrolyte solution with controlled viscosity, preventing solvent evaporation and dye desorption, and incorporating assisting conductive particles for enhanced stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If liquid electrolyte solution is used, then manufacturing cost is low, but the electrolyte solution is flammable, evaporable, unstable and has poor dye adsorption
Solution Approach 1:
The patent combines liquid electrolyte components with a gel matrix material to create a gel electrolyte composite. This composite structure maintains the beneficial ionic conductivity of liquid electrolytes while adding the structural stability and non-flammability of the gel matrix, thereby resolving the contradiction between low manufacturing cost and high stability.
Solution Approach 2:
The patent modifies the physical state of the electrolyte by changing parameters such as viscosity, gel fraction, and crosslinking density. By controlling these parameters, the electrolyte transitions from a purely liquid state to a gel state, which reduces flammability and evaporation while maintaining ionic conductivity, thus improving reliability without significantly increasing manufacturing cost.
2Reliability
If gelatinous electrolyte is applied to form a thin film, then the electrolyte has better stability, but the solvent contained in the gelatinous electrolyte can easily evaporate during the manufacturing processes
Solution Approach 1:
The patent employs a gel matrix that forms a flexible thin film structure to contain the electrolyte solvent. This thin film structure reduces solvent exposure to the environment, minimizing evaporation during manufacturing processes while maintaining the stability benefits of the gelatinous electrolyte.
3Object-generated harmful factors
If the electrolyte solution has high saturated evaporation pressure, then the electrolyte solution is flammable and evaporable, but this leads to poor dye adsorption and instability
Solution Approach 1:
The patent converts the harmful high evaporation pressure into a beneficial property by selecting gel matrix materials and electrolyte compositions that leverage vapor pressure relationships to enhance dye adsorption. The controlled evaporation characteristics of the gel electrolyte create favorable conditions for dye molecules to adsorb onto the semiconductor surface, thereby transforming a harmful factor into a benefit for device performance and stability.
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 achieves stable and efficient photoelectric conversion with improved viscosity for printable characteristics, reducing solvent evaporation and dye desorption, and enhancing the stability and photoelectric conversion efficiency of dye-sensitized solar cells.
Implementation Method 1
a method involving the use of solvents like gamma-butyrolactone (gBL), propylene carbonate (PC), or 3-methoxypropionitrile (MPN) mixed with polymers such as polyacrylonitrile (PAN), polyvinyl acetate (PVA), or poly(ethylene oxide) (PEO) to create an electrolyte solution with controlled viscosity
Implementation Method 2
preventing solvent evaporation and dye desorption
Data Source
AI summary
An electrolyte for a dye-sensitized solar cell is disclosed. The electrolyte includes a solvent being one selected from a group consisting of gamma-butyrolactone (gBL), propylene carbonate (PC) and 3-methoxypropionitrile (MPN), and a polymer mixed with the solvent to form an electrolyte solution, wherein when the solvent is one of gBL and PC, the polymer is one selected from a group consisting of polyacrylonitrile (PAN), polyvinyl acetate (PVA), poly(acrylonitrile-co-vinyl acetate) (PAN-VA) and a combination thereof; and when the solvent is MPN, the polymer includes one of a mixture of poly(ethylene oxide (PEO) and polyvinylidene fluoride (PVDF), and a mixture of PEO and polymethylmethacrylate (PMMA).