Solar Cell Single-Side Texturing Dry Etching Passivation
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Solution Overview
Problem
Conventional solar cell manufacturing processes that texture both surfaces of a semiconductor substrate lead to reduced passivation properties and increased complexity, making it difficult to achieve high efficiency.
Innovation Solution
A method involving single-side texturing of the front surface using dry etching and mirror-polishing of the back surface to create a semiconductor solar cell with distinct surface roughness, enhancing light absorption and passivation, while simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If both front surface and back surface of semiconductor substrate are textured, then light absorption is improved, but passivation property of back surface is reduced
Solution Approach 1:
The patent divides the treatment of front and back surfaces into separate, independent processes. The front surface undergoes texturing while the back surface undergoes mirror polishing, allowing each surface to be optimized for its specific function without compromising the other.
Solution Approach 2:
Different surface treatments are applied to different locations of the semiconductor substrate. The front surface is textured to enhance light absorption, while the back surface is mirror-polished to improve passivation, creating local optimization tailored to the functional requirements of each surface.
2Ease of manufacture
If back surface texturing is eliminated to maintain passivation property, then manufacturing process is simplified, but light absorption may be reduced
Solution Approach 1:
Instead of applying the conventional approach of texturing both surfaces, the patent inverts the approach by mirror-polishing the back surface to create a smooth, reflective surface. This inverted approach maintains passivation while still managing optical properties through the front surface texturing and back surface reflection.
3Manufacturing precision
If dry etching is used for front surface texturing, then manufacturing precision is improved, but process complexity increases
Solution Approach 1:
The patent replaces conventional wet chemical etching with dry etching technology, substituting a chemically-based mechanical process with a physically-based plasma process. This substitution enables more precise control of surface roughness and texturing depth while reducing chemical waste and process variability.
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 improves solar cell efficiency by reducing optical losses and enhancing passivation properties, resulting in a simpler and more effective manufacturing method.
Implementation Method 1
a step of texturing a front surface of a semiconductor substrate having a first conductive type dopant by using a dry etching method
Implementation Method 2
a step of forming an emitter layer by ion-implanting a second conductive type dopant into the front surface of the semiconductor substrate
Data Source
AI summary
A method for manufacturing asolar cell includes texturing a front surface of a semiconductor substrate having a first conductive type dopant by using a dry etching method, forming an emitter layer by ion-implanting a second conductive type dopant into the front surface of the semiconductor substrate, forming a back passivation film on a back surface of the semiconductor substrate; and forming a first electrode electrically connected to the emitter layer and a second electrode being in partial contact with the back surface of the semiconductor substrate.