Busbar-Free IBC Solar Cell Layout for Lower Shading Loss

Solution Overview

Problem

The high manufacturing costs and large usage amount of metallized paste due to the presence of a busbar in the metallized electrode structure of traditional IBC solar cells, which also reduces photoelectric conversion efficiency by shielding light-receiving areas.

Innovation Solution

A busbar-free IBC solar cell design featuring alternately arranged finger electrode lines and conductive lines on the semiconductor substrate, eliminating the need for busbars and reducing paste usage, with wider finger electrode lines and staggered intervals to prevent short circuits and enhance current collection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If busbars are used in the metallized electrode structure, then current collection is improved, but manufacturing costs increase and photoelectric conversion efficiency decreases due to shading

Engineering Contradiction:

Improvecurrent collectionVSAvoidphotoelectric conversion efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The invention extracts and removes the busbar component from the electrode structure, replacing it with a busbar-free design where finger electrode lines directly connect to conductive lines. This eliminates the shading problem caused by busbars while maintaining current collection functionality through the alternative conductive path structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The electrode structure is segmented into multiple finger electrode lines that are alternately arranged and connected to different conductive lines. This segmentation distributes the current collection function across multiple smaller contacts rather than relying on a single busbar, thereby reducing shading while maintaining effective current collection.

Inventive Principle:

Principle #1Segmentation

2Reliability

If busbars are used in the metallized electrode structure, then current collection is improved, but manufacturing costs increase due to large usage amount of metallized paste

Engineering Contradiction:

Improvecurrent collectionVSAvoidmanufacturing costs

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention extracts and removes the busbar component from the electrode structure, replacing it with a busbar-free design where finger electrode lines directly connect to conductive lines. This eliminates the shading problem caused by busbars while maintaining current collection functionality through the alternative conductive path structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The electrode structure is segmented into multiple finger electrode lines that are alternately arranged and connected to different conductive lines. This segmentation distributes the current collection function across multiple smaller contacts rather than relying on a single busbar, thereby reducing shading while maintaining effective current collection.

Inventive Principle:

Principle #1Segmentation

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 design reduces manufacturing costs, minimizes paste usage, and improves photoelectric conversion efficiency by eliminating busbar-related shading and enabling firm soldering connections, thereby enhancing energy conversion efficiency.

Implementation Method 1

Solar energy is a clean and sustainable energy source. In the past, positive and negative poles of a solar cell were designed on two sides of the solar cell, which prevented irradiation of part of the sunlight into the solar cell

Methodology Applied

Scientific EffectPhotovoltaic effect: Photovoltaic Effect

Data Source

PatentUS12199203B2Busbar-free interdigitated back contact solar cell and interdigitated back contact solar cell module

Publication Date: 2025.01.14 JINKO SOLAR (HAINING) CO LTS

AI summary

Provided is a busbar-free interdigitated back contact (IBC) solar cell and an IBC solar cell module. The IBC solar cell includes a semiconductor substrate, finger electrode lines and conductive lines. The finger electrode lines include first finger electrode lines and second finger electrode lines that are alternately arranged on the semiconductor substrate. The conductive lines include first conductive lines and second conductive lines that are alternately arranged. The first conductive lines are connected to the first finger electrode lines and spaced apart from the second finger electrode lines. The second conductive lines are connected to the second finger electrode lines and spaced apart from the first finger electrode lines.