Perovskite Solar Cell Encapsulation Structure for Moisture Barrier
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Solution Overview
Problem
Perovskite solar cells are susceptible to degradation due to moisture and oxygen, leading to reduced photoelectric conversion efficiency, and existing encapsulation technologies fail to provide adequate moisture and oxygen barriers, which are compromised by high-temperature processes.
Innovation Solution
An encapsulation structure for perovskite solar cells comprising alternately stacked polyolefin thermoplastic elastomer layers and inorganic layers, with specific materials and thicknesses, to enhance moisture and oxygen barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional encapsulation materials are used, then the encapsulation process is simple, but the moisture and oxygen barrier property is insufficient
Solution Approach 1:
The patent employs a composite encapsulation structure combining polyolefin thermoplastic elastomer layers with inorganic layers (such as silicon oxide, silicon nitride, or aluminum oxide). This composite structure leverages the advantages of both material types: the polyolefin provides flexibility and adhesion while the inorganic layers provide superior moisture and oxygen barrier properties, achieving enhanced protection without excessive complexity.
Solution Approach 2:
The encapsulation structure is divided into multiple alternating layers of polyolefin thermoplastic elastomer and inorganic materials. This segmentation allows each layer to perform its specific function optimally - the polyolefin layers provide structural flexibility and bonding, while the inorganic layers provide barrier protection, collectively achieving superior moisture and oxygen resistance.
2Reliability
If high-temperature encapsulation process is used, then the encapsulation effectiveness is improved, but the perovskite solar cell performance is affected
Solution Approach 1:
The patent changes the temperature parameter of the encapsulation process to occur at or below 150°C, which is significantly lower than conventional high-temperature processes. This parameter change allows the encapsulation to be effective without damaging the perovskite solar cell materials, thereby maintaining photoelectric conversion efficiency while achieving reliable encapsulation protection.
3Reliability
If single-layer encapsulation is used, then the manufacturing process is simple, but the waterproofness requirement is not met
Solution Approach 1:
The patent uses a composite multi-layer structure where inorganic layers provide superior water vapor barrier properties that single-layer encapsulation cannot achieve. The alternating arrangement of polyolefin and inorganic layers creates a cumulative barrier effect that effectively prevents moisture penetration while remaining manufacturable.
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 significantly improves the lifespan and stability of perovskite solar cells by reducing water vapor transmission and maintaining high efficiency in humid environments.
Implementation Method 1
the inorganic layer has the effect of supplementing the POE layer, and the inorganic layer is prepared from an inorganic material having excellent light transmittance and moisture and/or oxygen barrier property
Implementation Method 2
the polyolefin thermoplastic elastomer layer includes at least one of an ethylene-vinyl acetate (EVA) copolymer layer, a polyolefin elastomer (POE) layer, a co-extruded POE encapsulation film (EPE) layer, and a polyvinyl butyral (PVB) layer, and preferably includes a POE layer, so as to improve the adhesion property of the polyolefin thermoplastic elastomer layer to the inorganic layer and the perovskite solar cell module
Data Source
Figure 1~3
Figure 4
AI summary
The present disclosure belongs to the technical field of photovoltaic modules, and relates to an encapsulation structure of perovskite solar cell module and an encapsulation method of encapsulation structure of perovskite solar cell module. The encapsulation structure includes a transparent conductive substrate, a perovskite solar cell module and an encapsulation component, which are sequentially stacked; the encapsulation component includes an encapsulation layer and a glass cover plate disposed thereon; and the encapsulation layer has a structure in which at least one polyolefin thermoplastic elastomer layer and at least one inorganic layer are alternately stacked. The polyolefin thermoplastic elastomer layer and the inorganic layer have a better complementary effect and excellent adhesion property, so that a perovskite cell can be better encapsulated by the encapsulation component and thus has a very low water vapor transmission efficiency, thereby the corrosion of water and/or oxygen to the perovskite cell can be reduced; and meanwhile the perovskite cell has relatively high tolerance to potential-induced attenuation, and thus has a relatively long service life and relatively good stability, therefore the perovskite cell can be applied to a high-humidity environment such as sleep, seasides, ponds, etc.