Coated Carrier Plate for Stable Solar Cell Sheet Resistance
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Solution Overview
Problem
The manufacturing process of heterojunction solar cells is hindered by the instability of sheet resistance in transparent conductive films due to moisture absorption by coating carrier plates, leading to fluctuations in product quality and extended stabilization times.
Innovation Solution
A preparation method for a coating carrier plate involving the deposition of a metal layer followed by oxidation treatment to form metal oxide layers, combined with transparent conductive film layers, to create a stable and moisture-resistant surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a coating carrier plate is used to support the solar cell during transparent conductive film deposition, then the solar cell can be properly supported and processed, but the carrier plate absorbs moisture from the environment which causes the sheet resistance to be initially high and requires a long stabilization period
Solution Approach 1:
A coating layer comprising a metal oxide layer and a transparent conductive film layer is applied to the carrier plate surface. This coating layer acts as an intermediary between the moisture-absorbing carrier plate and the solar cell, preventing moisture transfer to the solar cell while allowing the carrier plate to perform its support function. The metal oxide layer provides moisture barrier properties, and the transparent conductive film layer ensures proper electrical contact and low sheet resistance.
Solution Approach 2:
The coating layer is formed as a composite structure with a metal oxide layer (such as silicon oxide, silicon nitride, or silicon oxynitride) combined with a transparent conductive film layer (such as ITO, AZO, or GZO). This composite material structure combines the moisture barrier properties of the metal oxide with the electrical conductivity of the transparent conductive film, achieving both moisture protection and electrical performance.
2Ease of repair
If the carrier plate is cleaned to remove deposited transparent conductive film material for reuse, then the carrier plate can be reused, but the sheet resistance remains unstable during the initial uses after cleaning
Solution Approach 1:
The coating layer is applied to the carrier plate surface before any deposition process begins. This preliminary coating prevents the direct contact between the carrier plate and the transparent conductive film material, reducing material deposition on the carrier plate and minimizing the need for aggressive cleaning that could affect subsequent performance.
Solution Approach 2:
The coating layer serves as a protective intermediary that reduces the adhesion of transparent conductive film material to the carrier plate. This makes subsequent cleaning processes gentler and more effective, allowing the carrier plate to be reused while maintaining stable electrical properties from the first use after cleaning.
3Device complexity
If no coating layer is applied to the carrier plate, then the structure is simpler and the process is shorter, but the sheet resistance is initially high and takes a long time to stabilize
Solution Approach 1:
The coating layer is applied in advance to the carrier plate surface before the solar cell production process begins. This preliminary action ensures that the carrier plate is pre-conditioned with moisture barrier and electrical conductivity properties, eliminating the need for a long stabilization period during actual production and enabling immediate use with stable performance.
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 reduces the initial sheet resistance of solar cells and stabilizes it quickly, ensuring consistent product quality and improving production efficiency by minimizing environmental sensitivity.
Implementation Method 1
placing the carrier plate substrate deposited with the metal layer in a first humid environment to absorb moisture and oxidizing the metal layer by the moisture
Implementation Method 2
oxidizing the metal layer by the moisture
Implementation Method 3
placing the carrier plate substrate in an environment containing an oxidizing substance to adhere the oxidizing substance to a surface of the carrier plate substrate
Implementation Method 4
depositing a metal layer on a carrier plate substrate by sputtering, and when depositing the metal layer, a sputtering power is controlled to be 8.5 KW to 13.5 KW
Data Source
AI summary
The present disclosure discloses a solar cell preparation method, including the following steps: providing a coating carrier plate; and placing, on the coating carrier plate, a wafter to be prepared into the solar cell, and depositing a transparent conductive film on a surface of the wafter, wherein a method for preparing the coating carrier plate include: depositing a metal layer on a carrier plate substrate, and then oxidizing the metal layer to form a metal oxide layer on the metal layer.