Analysis of Light Transmittance Technology and Application Trends in BIPV Solar Modules (2025)
Light transmittance is the defining parameter that distinguishes BIPV (Building-Integrated Photovoltaics) from conventional PV systems, critically influencing the triple balance of architectural daylighting, aesthetic design, and power generation efficiency. By 2025, mainstream technologies have achieved customizable transmittance (10%-70%) to address diverse application scenarios:
Daylight-Optimized Applications (e.g., curtain walls, skylights):
Transmittance ≥50%, harmonizing natural illumination with energy production.
Power-Generation Focused Applications (e.g., opaque façades):
Transmittance ≤20%, maximizing energy output while maintaining structural integrity.
Technical Context:
Perovskite BIPV now enables dynamic transparency adjustment (30-70%) without significant efficiency loss (<1.5% penalty at 50% transmittance, per NREL 2024 data).
Crystalline silicon variants dominate ≤30% transmittance markets due to superior durability in harsh climates.
For conventional BIPV modules:
10% increase in light transmittance typically results in 1%-2% reduction in power conversion efficiency.
Advanced solutions (2025 benchmarks):
Perovskite tandem designs (e.g., perovskite-silicon stacks) limit efficiency loss to <0.5% per 10% transmittance gain.
High-transmittance components (>50%):
Require Low-E (low-emissivity) coatings to mitigate thermal load:
Reduces building cooling demand by 15-30%.
Maintains visible light transmittance while blocking >75% infrared radiation.
Projection: Dynamic Transmittance BIPV to Capture 45% of Premium Architectural Market by 2027, Becoming Standard "Building Skin"
