Solar Cell Dopant Layer with Oxide Interface
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Solution Overview
Problem
Current solar cells face challenges in achieving maximum efficiency and minimizing manufacturing costs, which are essential for commercialization.
Innovation Solution
A solar cell design featuring a semiconductor substrate with a dopant layer having a crystalline structure different from the substrate, including a plurality of semiconductor layers stacked with an oxide interface layer, which enhances electrical properties and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional dopant layer with the same crystalline structure as the semiconductor substrate is used, then the manufacturing process is simpler, but the electrical properties and efficiency of the solar cell are insufficient
Solution Approach 1:
The dopant layer is formed as a composite structure comprising multiple semiconductor layers with different crystalline orientations (e.g., <100> and <110> directions) stacked alternately. This composite crystalline structure improves electrical properties by reducing carrier recombination at interfaces while maintaining manufacturability through sequential deposition processes.
Solution Approach 2:
The dopant layer is segmented into multiple thin semiconductor layers rather than forming a single thick layer. Each layer has a specific crystalline orientation and thickness, creating a multi-layered structure that enhances electrical performance by controlling carrier transport and reducing defects at layer interfaces.
2Productivity
If the dopant layer uses a complex multi-layer structure with interface layers, then the efficiency is improved, but the manufacturing complexity increases
Solution Approach 1:
Interface layers are introduced between adjacent semiconductor layers with different crystalline orientations. These interface layers act as mediators that reduce lattice mismatch and minimize carrier recombination at interfaces, thereby improving overall device efficiency while allowing the use of complex multi-layer structures.
Solution Approach 2:
The crystalline orientation parameters of the semiconductor layers are systematically varied (e.g., alternating between <100> and <110> orientations) to optimize electrical properties. By changing the crystalline structure parameters rather than simply increasing layer thickness, high efficiency is achieved with a manageable number of layers.
3Reliability
If the dopant layer is formed with a single-layer structure, then the manufacturing time is reduced, but the light absorption and electrical performance are insufficient
Solution Approach 1:
Instead of improving performance by increasing the thickness of a single dopant layer, the invention transitions to a multi-dimensional approach by stacking multiple thin layers with different crystalline orientations. This vertical stacking architecture enhances light absorption and electrical performance without proportionally increasing manufacturing time, as each thin layer can be deposited rapidly.
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 design improves the solar cell's efficiency and productivity by optimizing the dopant layer's structure and interface, leading to increased light absorption and reduced manufacturing time, thereby enhancing the solar cell's performance and cost-effectiveness.
Implementation Method 1
an interface layer interposed therebetween. The interface layer is an oxide layer having a higher concentration of oxygen than that in each of the plurality of semiconductor layers
Data Source
AI summary
Disclosed is a solar cell including a semiconductor substrate, and a dopant layer disposed over one surface of the semiconductor substrate and having a crystalline structure different from that of the semiconductor substrate, the dopant layer including a dopant. The dopant layer includes a plurality of semiconductor layers stacked one above another in a thickness direction thereof, and an interface layer interposed therebetween. The interface layer is an oxide layer having a higher concentration of oxygen than that in each of the plurality of semiconductor layers.