Abstract
We evaluate a Fresnel-plano-concave for low-concentration photovoltaics (LCPV) against a single Fresnel lens. A spectral Monte Carlo ray-tracing model with Sellmeier dispersion is coupled to the Air Mass 1.5 Global (AM1.5G) spectrum and a poly-Si external quantum efficiency (EQE) to convert wavelength-resolved irradiance into photocurrent on a $52 \times 52 \mathrm{~mm}$ cell under equal-power normalization. We analyze centerline profiles, spectral contribution versus radius, and normalized photocurrent maps, and extract the coefficient of variation (CV) and a center-to-edge ratio. Both layouts deliver comparable short-circuit current, while the markedly improves uniformity. CV drops from 23.01 to $0.588(-97.5 \%)$, and the center-to-edge ratio reaches 0.998, indicating near-uniform current across the active area. Spectral fractions are nearly constant with radius, evidencing mitigation of chromatic segregation. Thus, a minimal Fresnel-plano-concave homogenizes photocurrent without a current penalty, promising lower resistive and thermal losses and tighter module matching in LCPV systems.