Clustered Dye Working Electrode for Shorter Electron Diffusion
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Solution Overview
Problem
Conventional dye-sensitized solar cells face inefficiencies due to thick semiconductor layers required for sufficient dye absorption, which increase electron diffusion lengths and reduce conversion efficiency, especially under weak light sources like indoor light.
Innovation Solution
A working electrode with a light-absorbing layer formed by clusters of dye molecules, eliminating the need for a semiconductor scaffolding layer, allowing for a thinner design and improved light absorption efficiency by arranging dye molecules in a crystal lattice or random structure, enabling direct electrical contact with a conductive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a thick semiconductor layer is used to ensure sufficient dye absorption, then the light absorption capability is improved, but the electron diffusion length increases and conversion efficiency decreases
Solution Approach 1:
The invention divides the light absorbing layer into discrete clusters of dye molecules rather than using a continuous thick semiconductor layer. Each cluster is sufficiently thin to maintain short electron diffusion paths while collectively providing sufficient light absorption capacity through their aggregated structure.
Solution Approach 2:
The invention creates a composite structure combining dye molecules with a semiconductor scaffolding material. The dye molecules are embedded within or on the semiconductor matrix, forming a composite light absorbing layer that achieves both sufficient absorption and short electron transport distances.
2Quantity of substance
If a thick semiconductor layer is used to hold more dye molecules, then the light absorption is improved, but the device complexity and manufacturing complexity increase
Solution Approach 1:
The light absorbing layer is segmented into multiple independent clusters distributed throughout the device. This segmentation allows each cluster to be relatively simple in structure while the collective arrangement provides sufficient dye quantity without requiring a single thick complex layer.
Solution Approach 2:
The invention applies local quality by concentrating dye molecules into specific cluster regions rather than uniformly distributing them throughout a thick layer. Each cluster has high local dye concentration for efficient absorption, while the overall structure remains thin and simple.
3Quantity of substance
If a thick semiconductor layer is used to increase dye content, then the light absorption capability is improved, but the electron diffusion path length increases reducing efficiency
Solution Approach 1:
The light absorbing layer is divided into multiple thin clusters rather than one thick continuous layer. This segmentation ensures that electrons generated in any cluster have a short diffusion distance to reach the electrode, while the multiple clusters collectively provide sufficient dye content for effective light absorption.
Solution Approach 2:
The invention transitions from a single thick three-dimensional layer to multiple thin clusters arranged in space. This dimensional reorganization allows the system to maintain high dye content through increased cluster number and distribution rather than increasing individual cluster thickness, thereby keeping electron diffusion paths short.
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
This configuration reduces production time, increases efficiency by shortening electron diffusion paths, and allows for tailored bandgaps to optimize light absorption across various light spectra, enhancing performance under both indoor and outdoor conditions.
Implementation Method 1
Photovoltaic devices provide conversion of light into electricity using semiconducting materials that exhibit a photovoltaic effect. Light incident on the surface of the photovoltaic device produces electric power.
Implementation Method 2
When the energy of a photon is equal to or greater than the bandgap of the light absorbing material, the photon is absorbed by the material and a photo-excited electron is generated.
Implementation Method 3
The semiconducting particles serve as a material for transportation of the excited electrons to a conductive layer.
Data Source
AI summary
The present invention relates to a working electrode (1a) for a photovoltaic device, comprising a light absorbing layer (3) and a conductive layer (6) arranged in electrical contact with the light absorbing layer (3), and the light absorbing layer (3) comprises a light absorbing photovoltaic material consisting of a plurality of dye molecules. The light absorbing layer (3) is formed by a layer of a plurality of clusters (7), whereby each cluster (7) is formed by dye molecules and each dye molecule in the cluster (7) is bonded to its adjacent dye molecules.