Publication date: 15th December 2025
Building-integrated photovoltaics (BIPV) can enhance urban sustainability while meeting architectural design needs; however, strong coloration often compromises photovoltaic performance due to optical filtering that reshapes the usable spectrum. This poster presents a general inverse-design workflow for creating color-tunable photonic coatings for photovoltaics, aiming to achieve a desired visible appearance while maintaining an optical response compatible with efficient energy harvesting. The approach treats color as a design target and searches for multilayer structures that meet both appearance and device-oriented constraints, rather than relying on trial-and-error tuning.
The workflow combines multilayer optical modeling with automated optimization and perceptual color evaluation in standard color spaces, enabling systematic exploration of many possible designs. In addition to matching target hues, the optimization also considers practical aspects such as manufacturability and spectral constraints outside the visible region, which are crucial for minimizing unnecessary performance losses. Proof-of-concept prototypes are used to validate that optimized designs can be translated into realizable thin-film stacks on photovoltaic-relevant substrates, and that the resulting devices exhibit controllable visual appearance. Overall, the poster highlights a scalable route toward customizable colored PV elements for BIPV and suggests how inverse optical design can support both aesthetics and energy functionality in future building materials.
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