Abstract
Building-integrated photovoltaics (BIPV) require technologies that balance energy performance, durability, and aesthetics. Shingled heterojunction (HJT) solar cells offer high efficiency, excellent low-light response, and design flexibility, making them a promising candidate for façade applications. This study investigates the performance and stability of shingled HJT modules fabricated with different material combinations and color configurations. Eight modules were subjected to accelerated aging through humidity-freeze (HF10) testing, and their behavior was evaluated using IV characterization, electroluminescence (EL) imaging, visual inspection, and colorimetry. Results indicate that color integration reduces electrical output by 4–11% compared with reference modules, a trade-off consistent with typical BIPV requirements. Aesthetic stability, assessed through colorimetry, remained largely unchanged after stress testing, with ΔE values below or close to perceptibility thresholds, confirming good visual durability. Performance losses after HF10 were primarily linked to technological issues such as delamination and string mismatch rather than intrinsic limitations of the shingled HJT concept. Overall, the findings demonstrate that shingled HJT modules are a strong candidate for next-generation BIPV, provided that material compatibility and lamination processes are further optimized to ensure long-term reliability in real-world building applications.