Integrated Bypass Diode Layout for Hot-Spot-Resistant Solar Modules

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Solution Overview

Problem

Conventional solar cell modules face issues with hot-spot heating and damage due to reverse bias voltage when shaded cells are connected in series, necessitating external bypass diodes that can obstruct light transmission and apply bonding pressure to sensitive layers.

Innovation Solution

Integration of bypass diodes within hybrid solar cell plates, utilizing a step surface configuration that accommodates the diodes laterally adjacent to the solar cells, allowing for direct integration without blocking light and reducing mechanical stress on sensitive layers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If bypass diodes are soldered externally to photovoltaic modules, then operational stability is improved, but device complexity and manufacturing complexity increase

Engineering Contradiction:

Improveoperational stabilityVSAvoidmodule structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The bypass diode is integrated directly into the solar cell structure by forming it within the semiconductor substrate using dopant regions, eliminating the need for separate external diode components and their associated soldering connections. This merging of the bypass function into the cell itself reduces overall device complexity while maintaining the protective function.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The solar cell structure itself provides the bypass functionality through internally formed dopant regions that create the diode junction. The cell serves its primary photovoltaic function while simultaneously providing the bypass protection mechanism, eliminating the need for separate bypass components.

Inventive Principle:

Principle #25Self-service

2Ease of manufacture

If bypass diodes are integrated into solar cells, then manufacturing complexity is reduced, but manufacturing precision requirements increase

Engineering Contradiction:

Improvemodule assembly simplicityVSAvoiddopant region alignment

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The dopant regions forming the bypass diode are created during the initial solar cell fabrication process through standard diffusion or ion implantation techniques. By establishing the bypass structure in advance during normal cell manufacturing, separate precision alignment steps for integrating external diodes are eliminated.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The mechanical process of soldering external diodes to cell contacts is replaced by semiconductor fabrication processes (diffusion, ion implantation, or in-situ doping) that form the diode junctions directly within the cell substrate. This substitution leverages established semiconductor manufacturing precision rather than requiring mechanical alignment and soldering precision.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Power

If solar cells are connected in series to increase voltage, then power output is improved, but susceptibility to reverse bias damage increases

Engineering Contradiction:

Improvevoltage outputVSAvoidreverse bias voltage susceptibility

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The bypass diode structure is pre-formed within each solar cell to provide protective cushioning against reverse bias damage before it can occur. When series-connected cells experience shading or faults causing reverse bias conditions, the internally integrated diodes immediately conduct to clamp the reverse voltage, preventing hot-spot formation and damage to the series string.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 integrated bypass diodes effectively prevent hot-spot heating while maintaining efficient light transmission and structural integrity, enhancing the operational stability and reliability of solar cell modules.

Implementation Method 1

shading of a solar cell wired in series within a string of solar cells can force the cell into reverse bias, causing hot-spot heating which may lead to detrimental effects such as cracking, shorting, or delamination. A bypass diode can limit the reverse bias voltage a shaded solar cell experiences

Methodology Applied

Scientific EffectReverse bias breakdown:

Implementation Method 2

An insulator material or air gap may be located laterally between the bypass diode and the top subcell to prevent shorting

Methodology Applied

Scientific EffectElectrical insulation:

Implementation Method 3

the bottom electrode layer spans underneath the bypass diode (and floor) to make back side electrical connection with both the solar cell and bypass diode of the hybrid solar cell plate

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS12622125B2Integrated bypass diode schemes for solar modules

Publication Date: 2026.05.05 SWIFT SOLAR INC

AI summary

Hybrid solar cell plates with integrated bypass diodes and modules thereof are described. In an embodiment, a hybrid solar cell plate includes a step surface including a floor and a step edge extending from the floor and across a thickness of a top subcell. A bypass diode is over the floor and laterally adjacent to the step edge.