Solar Cell Electrode Segmentation for Resistance Reduction
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Solution Overview
Problem
Conventional solar cells face efficiency limitations due to suboptimal design of layers and electrodes, hindering their practical application as alternative energy sources.
Innovation Solution
A solar cell structure is enhanced by incorporating a semiconductor substrate with conductive type regions and electrodes, where the electrode layer is patterned using a printed electrode layer as a mask, improving contact properties and reducing electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional electrode structure is used, then the manufacturing process is simpler, but the electrical resistance is higher and photoelectric conversion efficiency is lower
Solution Approach 1:
The electrode is divided into two distinct layers: a first electrode layer formed by sputtering with uniform thickness, and a second electrode layer formed by screen printing with metal paste. This segmentation allows each layer to fulfill specific functions - the first layer provides uniform base coverage and adhesion, while the second layer provides high conductivity in patterned regions, thereby reducing overall electrical resistance without requiring complete structural redesign
Solution Approach 2:
The electrode combines two different material systems: a metal film layer (such as aluminum or silver) deposited by sputtering, and a metal paste layer containing conductive particles suspended in a glass frit matrix applied by screen printing. This composite structure leverages the advantages of both materials - the uniform coverage and adhesion of the sputtered metal film, and the high conductivity and cost-effectiveness of the screen-printed metal paste, achieving reduced electrical resistance while maintaining manufacturing simplicity
2Reliability
If the electrode thickness is increased to reduce electrical resistance, then the photoelectric conversion efficiency improves, but the manufacturing complexity increases
Solution Approach 1:
The electrode thickness requirement is segmented across two layers: the first electrode layer provides a uniform thin base layer for adhesion and coverage, while the second electrode layer adds thickness selectively in patterned regions where high current density exists. This segmentation achieves the necessary overall thickness for low resistance and good carrier collection without requiring uniform thick deposition across the entire electrode area, thereby avoiding excessive manufacturing complexity
Solution Approach 2:
The first electrode layer is formed by sputtering before the second electrode layer is applied by screen printing. This preliminary action creates a uniform adhesive base that ensures proper bonding of the subsequent metal paste layer, preventing defects such as peeling or poor contact. By preparing this foundation in advance, the manufacturing process achieves reliable thick electrode formation without requiring complex process adjustments or rework
3Ease of manufacture
If a single-layer electrode is used, then the manufacturing process is simpler, but the contact properties with the semiconductor substrate are insufficient
Solution Approach 1:
The electrode contact function is segmented into two layers: the first electrode layer formed by sputtering provides intimate contact with the semiconductor substrate through uniform thin-film deposition, ensuring good electrical contact and adhesion. The second electrode layer formed by screen printing provides additional conductivity and mechanical strength. This segmentation allows each layer to optimize for its specific function - the first layer for contact quality and the second layer for conductivity, achieving reliable contact properties while maintaining manufacturing simplicity
Solution Approach 2:
The electrode uses a composite structure combining a sputtered metal film layer and a screen-printed metal paste layer. The sputtered metal film provides excellent adhesion to the semiconductor substrate due to its uniform coverage and atomic-level bonding, while the metal paste layer provides high conductivity and cost-effectiveness. This composite material approach ensures reliable electrode-substrate contact without requiring a single complex material system
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 approach simplifies the manufacturing process and enhances the efficiency of solar cells by increasing the thickness of the electrode and reducing electrical resistance, leading to improved carrier collection and photoelectric conversion efficiency.
Implementation Method 1
forming a printed electrode layer having a pattern on the electrode layer, and forming an electrode layer between the conductive type region and the printed electrode layer. The forming of the electrode layer includes patterning the metal layer by using the printed electrode layer as a mask
Implementation Method 2
solar cells are attracting considerable attention as next generation cells which convert solar energy into electrical energy
Data Source
Figure 1
Figure 2
Figure 3a~3d
AI summary
A solar cell (100) is discussed. A solar cell includes a semiconductor substrate (10), a conductive type region (32, 34) on one surface of the semiconductor substrate, and an electrode (42, 44) connected to the conductive type region. The electrode includes an electrode layer (42a) on the conductive type region and a printed electrode layer (42b) on the electrode layer.