Predicting Optical Bandgaps in C₆₀ and Functionalized Derivatives from Limited Data for Renewable Energy Applications

Accurate optical bandgap prediction is essential for advancing renewable energy materials, but data scarcity and complex non-linear dependencies limit traditional approaches, especially for C₆₀-based materials in organic photovoltaics. We propose a novel data-efficient machine learning framework that integrates Gaussian Process Regression (GPR) with Density Functional Theory (DFT) simulations to predict absorbance spectra and compute optical bandgaps from limited data. Our approach leverages Bayesian inference for uncertainty quantification, significantly reducing reliance on computationally expensive DFT calculations while maintaining accuracy. We demonstrate that our method generalizes across C₆₀ and functionalized derivatives, enabling scalable and cost-effective bandgap prediction with minimal training samples.