Solar Cell Manufacturing via Light-Assisted Hydrogen Passivation
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Solution Overview
Problem
The existing methods for manufacturing solar cells face challenges in maximizing efficiency and simplifying the process, particularly in reducing output losses and improving the crystallinity of semiconductor substrates to enhance electrical characteristics.
Innovation Solution
A method for manufacturing a solar cell using a crystalline semiconductor substrate with textured surfaces, dielectric films, and electrodes, where hydrogen-based passivation and anti-reflection films are used to minimize light reflection and prevent the formation of detrimental dopant combinations, thereby improving the solar cell's efficiency and reducing output losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional manufacturing methods are used, then the manufacturing process is simpler, but output loss increases and efficiency decreases
Solution Approach 1:
The patent applies preliminary action by performing hydrogenation treatment on the semiconductor substrate before the main manufacturing processes. This pre-treatment introduces hydrogen atoms that passivate defects and reduce recombination sites, thereby reducing output loss and improving efficiency before subsequent manufacturing steps occur.
Solution Approach 2:
The patent utilizes parameter changes by controlling the hydrogenation process parameters including temperature (200-400°C), time (1-10 minutes), and hydrogen concentration. By optimizing these parameters, the patent achieves maximum reduction in output loss while maintaining manufacturing feasibility, thus improving productivity without excessive energy loss.
2Productivity
If multiple layers and electrodes are designed to maximize efficiency, then solar cell efficiency improves, but manufacturing process complexity increases
Solution Approach 1:
The patent extracts the complexity reduction by separating the efficiency-enhancing function from the manufacturing process complexity. Instead of complicating the manufacturing process with multiple layers and electrodes, the patent extracts the essential function of defect reduction through hydrogenation treatment, achieving high efficiency with a simplified manufacturing approach.
Solution Approach 2:
The patent applies parameter changes to the semiconductor substrate properties through hydrogenation, altering the material characteristics (increasing carrier lifetime, reducing recombination) without adding structural complexity. This allows high efficiency to be achieved through material property optimization rather than complex multi-layer结构设计.
3Loss of energy
If hydrogenation treatment is applied, then output loss is reduced and efficiency is improved, but additional processing steps are required
Solution Approach 1:
The patent merges the hydrogenation treatment with existing manufacturing processes by integrating it into the thermal processing steps already required for solar cell fabrication. By combining the hydrogenation step with annealing or other thermal processes, the patent reduces output loss without adding significant processing complexity, as the hydrogenation is performed concurrently with necessary manufacturing heat treatments.
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 method enhances the solar cell's efficiency by increasing light absorption, reducing recombination sites, and simplifying the manufacturing process, leading to improved electrical characteristics and reduced output losses.
Implementation Method 1
hydrogen atoms are supplied into the semiconductor substrate
Implementation Method 2
a solar cell that converts photovoltaic energy into electrical energy
Data Source
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AI summary
A method of manufacturing a solar cell is discussed. The method of manufacturing the solar cell includes: forming a conductive region on a semiconductor substrate; forming an electrode connected to the conductive region; and post-processing the semiconductor substrate to passivate the semiconductor substrate. The post-processing of the semiconductor substrate comprises a main processing process for heat-treating the semiconductor substrate while providing light to the semiconductor substrate. A temperature of the main processing process is about 100°C to about 800°C, and the temperature and light intensity of the main processing process satisfy Equation of 1750 - 31.8·T + (0.16)·T2 ≤ I. Here, T is the temperate (°C) of the main processing process, and I is the light intensity(mW/cm2) of the main processing process.