Bifacial Solar Cell Module Back Transparent Substrate Light Management
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Solution Overview
Problem
Conventional solar cell modules face inefficiencies due to limited light absorption from the back surface, which reduces overall energy conversion efficiency.
Innovation Solution
Incorporating a bifacial solar cell module with a back transparent substrate featuring a base layer, a first sheet layer, a second sheet layer, and an anti-reflection layer made of materials like silicon oxide, aluminum oxide, or zinc oxide, which enhances light reflection and absorption from both the front and back surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional back sheet is used for packaging solar cells, then weather resistance and durability are improved, but light absorption efficiency from the back surface deteriorates
Solution Approach 1:
The back sheet is constructed as a multi-layer composite structure combining a base layer (for mechanical strength and weather resistance) with transparent sheet layers and anti-reflection layers (for light transmission and absorption). This composite structure simultaneously achieves durability and enhanced light absorption efficiency.
Solution Approach 2:
Different layers of the back sheet are assigned different functional properties: the base layer provides mechanical protection and weather resistance, while the transparent sheet layers and anti-reflection layers are optimized for light transmission. This local differentiation of material properties allows simultaneous optimization of both durability and light absorption.
2Productivity
If only the front surface of solar cells is used for light absorption, then device simplicity is maintained, but energy conversion efficiency deteriorates
Solution Approach 1:
The back sheet is designed to serve multiple functions simultaneously: it provides mechanical protection, ensures weather resistance, and acts as a light management component through its transparent layers and anti-reflection coating. This multi-functionality enables back surface light absorption without proportionally increasing overall system complexity.
3Reliability
If the back sheet is made opaque for protection, then durability is improved, but light utilization deteriorates
Solution Approach 1:
The back sheet employs a multi-layer structure where the base layer provides opaque mechanical protection and weather resistance, while additional transparent sheet layers and anti-reflection layers are incorporated to enable light transmission. This local differentiation allows simultaneous achievement of protection capability and light utilization.
Solution Approach 2:
The back sheet combines materials with different optical properties - opaque base layer materials for protection and transparent anti-reflection layer materials for light transmission - creating a composite structure that achieves both protection capability and enhanced light utilization efficiency.
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 configuration increases the efficiency of the solar cell module by improving light utilization, leading to enhanced back surface output and total power generation, with increased transmittance and power generation efficiency.
Implementation Method 1
an incident light through the front surface of the solar cell is reflected and is again incident on the back surface of the solar cell
Implementation Method 2
A solar cell to which solar energy generation principle is applied is a semiconductor device, which converts sunlight into electrical energy
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A solar cell module is disclosed. The solar cell module (100) includes a plurality of solar cells (10), a front transparent substrate (50) located in a front surface of the plurality of solar cells, a back transparent substrate (60) located on a back surface of the plurality of solar cells, a front protection unit (30) located between the front transparent substrate and the plurality of solar cells, and a back protection unit (40) located between the back transparent substrate and the plurality of solar cells. The back transparent substrate includes an anti-reflection layer (630).