Perovskite Module Encapsulation With Desiccant Planarization Layer

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Solution Overview

Problem

Perovskite solar cells are susceptible to moisture and oxygen absorption, leading to ion migration and phase separation, which compromises their stability and lifespan.

Innovation Solution

A perovskite photovoltaic module with an encapsulation structure containing multiple encapsulation layers and a planarization layer made of a curable adhesive with a desiccant, where the desiccant is a metal oxide-based material with controlled particle size and concentration, to prevent moisture and oxygen ingress.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If perovskite solar cells are used, then high photoelectric conversion efficiency and low cost are achieved, but stability under illumination deteriorates due to moisture and oxygen absorption

Engineering Contradiction:

Improvestability under illuminationVSAvoidmoisture and oxygen absorption

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The encapsulation structure is divided into multiple encapsulation layers and planarization layers, with each layer serving as a barrier against moisture and oxygen. This segmented approach creates multiple defense lines that collectively prevent harmful factors from reaching the perovskite material.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The planarization layer containing desiccant acts as an intermediary substance between the encapsulation layers and the perovskite solar cell. The desiccant actively absorbs moisture and oxygen, preventing them from reaching and degrading the perovskite material.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If desiccant content in planarization layer is increased, then moisture and oxygen resistance improves, but planarization layer toughness deteriorates due to cracking

Engineering Contradiction:

Improvemoisture and oxygen resistanceVSAvoidplanarization layer toughness

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The optimal content of desiccant in the planarization layer is precisely controlled at 0.01% to 1% by weight. This parameter optimization ensures sufficient moisture and oxygen resistance while maintaining the structural toughness and preventing cracking of the planarization layer.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If desiccant particle size is decreased, then moisture absorption efficiency improves, but manufacturing cost increases due to dispersing difficulty

Engineering Contradiction:

Improvemoisture absorption efficiencyVSAvoiddispersing difficulty

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The particle size of desiccant is optimized to 1 μm to 10 μm, which provides sufficient moisture absorption efficiency while maintaining ease of dispersing and manufacturing. This parameter selection balances performance requirements with manufacturing feasibility.

Inventive Principle:

Principle #35Parameter changes

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 encapsulation structure effectively prevents moisture and oxygen penetration, enhancing the stability and flexibility of the perovskite solar cells, suitable for industrial production.

Implementation Method 1

the stability of perovskite solar cells under the illumination remains a significant challenge to be addressed. The perovskite solar cells known to inventors, due to numerous defects within the perovskite materials, are highly susceptible to absorbing moisture and oxygen from the environment

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 2

the planarization layer includes a curable adhesive and a desiccant, both of which have a water content of less than 100 ppm

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentEP4683472A1Perovskite photovoltaic module, manufacturing method therefor and use thereof

Publication Date: 2026.01.21 XIAN TJ-SOLAR NEW ENERGY CO LTD

Figure 1~2

AI summary

The present disclosure relates to a perovskite photovoltaic module and a preparation method and a preparation method and application thereof in the technical field of perovskite cells. The perovskite photovoltaic module disposes a planarization layer between adjacent encapsulation layers, enabling two adjacent encapsulation layers (e.g., a first encapsulation layer and a second encapsulation layer) to encapsulate the planarization layer. This arrangement can prevent moisture and oxygen from infiltrating through the interface between the second encapsulation layer and the perovskite solar cell substrate, thereby affecting the packaging effect of the perovskite photovoltaic module. The planarization layer is formed using a curable adhesive and a desiccant, each with a water content of less than 100 ppm, which extends the pathway for moisture and oxygen to enter the interior of the perovskite cell, thereby enhancing the packaging effect. In addition, the package structure of the perovskite photovoltaic assembly is formed using a mature process, allowing the free moisture and oxygen components in the planar layer to be absorbed by the desiccant. This prevents the components from diffusing to other functional layers or devices, reduces the impact of epoxy factors, and enhances the stability of the perovskite solar cell. The preparation process is simple and highly operable, making it suitable for industrial production.