Continuous Electrodeposition Cell for Large Solar Panels
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Solution Overview
Problem
Scaling up the electrodeposition process for thin film solar panel fabrication is challenging due to inefficiencies, high costs, and time-consuming methods when fabricating individual solar cells, which hinder the production of large panels like 60×120 cm2 with high precision and yield.
Innovation Solution
A continuous electrodeposition apparatus using an electroplating cell with a conveyor system featuring metal belted tracks and rollers, paddles, and baffles to uniformly deposit absorber materials on large panels, allowing for efficient and uniform deposition of thin films across large areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple solar cells are fabricated individually and then assembled into panels, then manufacturing flexibility is maintained, but production efficiency decreases and costs increase
Solution Approach 1:
The fabrication process is segmented into distinct functional zones within a single continuous reactor: a pretreatment zone for substrate preparation, an electrodeposition zone for absorber layer formation, and a drying zone for solvent removal. This segmentation allows each zone to be optimized independently while maintaining continuous production flow, resolving the contradiction between productivity and process complexity.
Solution Approach 2:
Multiple fabrication steps that were previously performed in separate individual cell processes are merged into a single continuous electrodeposition reactor. The substrate undergoes pretreatment, electrodeposition, and drying in one continuous pass through the reactor, eliminating the need for separate assembly operations and significantly improving production efficiency.
2Manufacturing precision
If individual solar cells are fabricated separately, then quality control is easier, but fabrication time and cost increase
Solution Approach 1:
The electrodeposition process operates continuously as substrates move through the reactor, eliminating idle time between batches. The continuous flow of electrolyte through the electrodeposition zone ensures uninterrupted material deposition, maintaining high manufacturing precision while dramatically reducing total fabrication time compared to batch processing of individual cells.
3Productivity
If large panels are fabricated in a single process, then production efficiency improves, but process control difficulty increases
Solution Approach 1:
Different zones within the continuous reactor are designed with locally optimized conditions: the pretreatment zone has specific pH and temperature conditions for substrate preparation, the electrodeposition zone has controlled electrolyte flow and electrical parameters for uniform film deposition, and the drying zone has controlled atmosphere for solvent removal. This local optimization maintains precise process control while enabling large panel fabrication.
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
Enables high-speed, low-cost fabrication of thin film solar panels with uniform microstructure and composition, achieving power conversion efficiencies of up to 7.3% for Cu2ZnSnS4 and 7% for Cu2ZnSnSe4, facilitating the production of large-scale solar panels with improved precision and yield.
Implementation Method 1
electrodeposition is used to deposit the material(s) that form the absorber layer of the solar cell
Implementation Method 2
Current or potential is supplied to the panel through the metal rollers and the metal belted track to plate the panel using the electroplating solution
Data Source
AI summary
Techniques for electrodeposition of thin film solar panels are provided. In one aspect, an electrodeposition apparatus is provided. The electrodeposition apparatus includes at least one electroplating cell; and a conveyor for moving panels over the electroplating cell, wherein the conveyor comprises at least one metal belted track over the electroplating cell surrounding a plurality of metal rollers. The electroplating cell can include an anode at a bottom of the electroplating cell; and a plurality of paddles at a top of the electroplating cell. A baffle may be located in between the anode and the paddles. An electroplating process is also provided.