Moisture Absorption and Desorption in an Ionomer-Based Encapsulant: A Type of Self-Breathing Encapsulant for CIGS Thin-Film PV Modules
| Autor: | Tobias Repmann, Miao Yang, Raymund Schäffler, Kay Orgassa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
Materials science General Computer Science Materials Science (miscellaneous) General Chemical Engineering Energy Engineering and Power Technology 02 engineering and technology 010402 general chemistry Cu(In Ga)Se2 photovoltaic module 01 natural sciences chemistry.chemical_compound Encapsulant Desorption Relative humidity Moisture absorption and desorption Composite material Thin film Ionomer Moisture General Engineering Humidity 021001 nanoscience & nanotechnology Equilibrium moisture content Copper indium gallium selenide solar cells 0104 chemical sciences chemistry lcsh:TA1-2040 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) |
| Zdroj: | Engineering, Vol 6, Iss 12, Pp 1403-1407 (2020) |
| ISSN: | 2095-8099 |
| Popis: | As an alternative to conventional encapsulation concepts for a double glass photovoltaic (PV) module, we introduce an innovative ionomer-based multi-layer encapsulant, by which the application of additional edge sealing to prevent moisture penetration is not required. The spontaneous moisture absorption and desorption of this encapsulant and its raw materials, poly (ethylene-co-acrylic acid) and an ionomer, are analyzed under different climatic conditions in this work. The relative air humidity is thermodynamically the driving force for these inverse processes and determines the corresponding equilibrium moisture content (EMC). Higher air humidity results in a larger EMC. The homogenization of the absorbed water molecules is a diffusion-controlled process, in which temperature plays a dominant role. Nevertheless, the diffusion coefficient at a higher temperature is still relatively low. Hence, under normal climatic conditions for the application of PV modules, we believe that the investigated ionomer-based encapsulant can “breathe” the humidity: During the day, when there is higher relative humidity, it “inhales” (absorbs) moisture and restrains it within the outer edge of the module; then at night, when there is a lower relative humidity, it “exhales” (desorbs) the moisture. In this way, the encapsulant protects the cell from moisture ingress. |
| Databáze: | OpenAIRE |
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