Textured TOPCon Solar Cell Structure for Light Trapping Passivation
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Solution Overview
Problem
Current solar cells face inefficiencies in photoelectric conversion due to issues in the preparation of back contact passivation structures, particularly in the use of Low Pressure Chemical Vapor Deposition (LPCVD) which can affect the performance of Tunnel Oxide Passivated Contact (TOPCon) cells.
Innovation Solution
A solar cell design featuring a substrate with textured structures and corresponding holes in the doped semiconductor layer, filled by a passivation layer, which enhances internal reflection and light trapping, while providing simultaneous passivation, thereby improving photoelectric conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If textured structures are added to the substrate surface to improve light trapping, then internal reflection is enhanced, but device complexity increases
Solution Approach 1:
The doped semiconductor layer is segmented by forming holes that correspond to the textured structures, creating a patterned structure that maintains light trapping while reducing overall complexity
Solution Approach 2:
Textured structures are applied only to specific portions of the substrate surface rather than uniformly, and holes are formed only where needed to expose these localized textured regions, optimizing light trapping where required while maintaining simplicity in other areas
2Reliability
If a passivation layer is formed to cover the entire surface to reduce recombination, then surface passivation is improved, but manufacturing complexity increases
Solution Approach 1:
The passivation layer is formed selectively in the holes rather than as a continuous layer, segmenting the passivation function to where it is most needed while simplifying the manufacturing process
Solution Approach 2:
The holes automatically guide the passivation layer formation process, as the passivation layer naturally fills the hole structures during deposition, eliminating the need for complex masking or patterning steps
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 increases short circuit current and open circuit voltage by reducing light loss and surface defects, enhancing the overall efficiency of the solar cell.
Implementation Method 1
The textured structures can improve internal reflection of the substrate, thereby reducing light loss of the solar cell
Implementation Method 2
a chemical passivation of the tunneling oxide layer and a field passivation of the polysilicon layer may be utilized to significantly reduce a recombination rate of minority carriers of the surface of the silicon substrate
Implementation Method 3
A solar cell is an apparatus that converts light energy of the sun into electric energy. The solar cell generates carriers by using a photovoltaic effect principle
Data Source
AI summary
Disclosed are a solar cell, a tandem solar cell, and a photovoltaic module. The solar cell includes a substrate, a doped semiconductor layer, a passivation layer and a plurality of electrodes. The substrate is provided with textured structures on a portion of a surface of the substrate. The doped semiconductor layer is disposed on the substrate. The solar cell further includes holes extending through the doped semiconductor layer, and corresponding to the textured structures, respectively, and a bottom of a respective hole exposes at least a portion of a corresponding textured structure. The passivation layer is formed over a surface of the doped semiconductor layer away from the substrate, fills the holes. The plurality of electrodes are arranged along a first direction, pass through the passivation layer and are in electrical contact with the doped semiconductor layer.