Perovskite Solar Module Laser Scribing Busbar Elimination

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Solution Overview

Problem

Existing internally series-connected perovskite solar cell modules require busbars, which can cause scratching of the back electrode layer, uneven stress distribution, and increased contact issues, leading to efficiency loss and structural weakness.

Innovation Solution

Utilize a laser scribing process to convert the back electrode layer into a conductor for series connection, eliminating the need for busbars and ensuring internal connections between sub-cell packs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If busbars are used for series connection, then electrical connection between sub-cell packs is achieved, but the back electrode layer is scratched causing localized short circuits and efficiency decrease

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidelectrode layer damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent merges the electrical connection function with the back electrode layer itself, eliminating the need for separate busbars. The back electrode layer is patterned to serve as both the functional electrode and the interconnect, thereby avoiding mechanical damage from busbar installation while maintaining reliable electrical connection between sub-cell packs

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent extracts the busbar component from the system by using the back electrode layer's own material and structure to perform the connection function. This removal of the external busbar eliminates the source of mechanical damage while preserving the essential electrical interconnection capability

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If busbars are introduced for series connection, then electrical connectivity is established, but uneven stress distribution occurs reducing module strength and impact resistance

Engineering Contradiction:

Improveelectrical connectivityVSAvoidmodule strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent combines the electrical connection function with the structurally integrated back electrode layer, creating a unified design where the connection path is part of the substrate structure. This integration ensures uniform stress distribution across the module while maintaining electrical connectivity, eliminating the stress concentration points that would occur with external busbars

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If more busbars are used for series connection, then series connection is achieved, but contact issues increase and manufacturing complexity increases

Engineering Contradiction:

Improveseries connectionVSAvoidnumber of busbars

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges multiple functions into the back electrode layer: it serves as both the active electrode for light absorption and as the interconnect for series connection. This integration eliminates the need for multiple separate busbars, reducing manufacturing complexity and potential contact issues while achieving the required series connection functionality

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The back electrode layer is designed to perform multiple functions simultaneously: it acts as the functional electrode for the solar cell and as the interconnect for series connection between sub-cell packs. This multi-functionality reduces the total number of components needed and simplifies the overall device structure

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 method prevents electrode layer damage, reduces contact issues, and enhances module strength and efficiency by using the back electrode layer as a conductor, allowing for series connection without busbars.

Implementation Method 1

Through an appropriate laser scribing process, a back electrode layer of the perovskite solar cell module is used as a conductor

Methodology Applied

Scientific EffectLaser ablation: Laser Ablation

Data Source

PatentEP4672927A1Internal series-connected perovskite solar cell module and preparation method therefor

Publication Date: 2025.12.31 QUZHOU MICROQUANTA RENEWABLE ENERGY TECHN CO LTD

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AI summary

An internal series-connected perovskite solar cell module and a preparation method therefor. The perovskite solar cell module comprises a plurality of longitudinally arranged battery sub-packs (1); each battery sub-pack (1) comprises a positive electrode lead-out section (3), a negative electrode lead-out section (4) and a plurality of battery cells (5) which are transversely arranged; and the internal structures of the positive electrode lead-out section (3), the negative electrode lead-out section (4) and the plurality of battery cells (5) respectively comprise, from bottom to top, a substrate (51), a front electrode layer (52), a light absorption layer (53) and a rear electrode layer (54). According to the present invention, the rear electrode layer (54) becomes a connecting wire between the battery sub-packs (1) by means of an appropriate laser scribing process, so as to achieve the effect of connecting the perovskite solar cell module in series to replace traditional busbars, thereby greatly reducing the use of the busbars, and effectively avoiding the problem of poor contact caused by using the busbars for series connection.