Backsheet is the protective rear layer of photovoltaic panels that provides electrical insulation, moisture resistance, and structural support.
The backsheet is a critical multilayer component located on the rear side of photovoltaic (PV) modules, serving as the primary barrier against environmental factors. It consists of polymer-based laminates (typically PET, PVF, or PVDF) with adhesive layers, providing dielectric strength exceeding 1000V, UV resistance, hydrolytic stability, and thermal endurance from -40°C to +85°C. Its primary functions include preventing moisture ingress, offering electrical insulation between solar cells and the external environment, and maintaining mechanical integrity against weathering stresses.
诱因 → 失效模式 → 工程缓解
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Quality backsheets are designed for 25+ years of service life, maintaining >80% of initial performance when exposed to standard environmental conditions per IEC 61215 accelerated testing protocols.
Most modern backsheets use recyclable PET cores, but multilayer structures require specialized separation processes. Emerging mono-material designs improve recyclability to support circular economy in PV industry.
Primary degradation mechanisms include UV-induced embrittlement, hydrolysis of PET layers in humid conditions, thermal cycling stress, and potential-induced degradation from electrical potential differences.
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