Resonator‐Engineered Micro‐Cavity–Driven Coupling for Electromagnetic Field Redistribution in PM6:Y6 Non‐Fullerene Organic Solar Cells

Çokduygulular E., Çetinkaya Ç.

Advanced Theory and Simulations, cilt.1, ss.1-20, 2026 (Hakemli Dergi)

Özet

Efficient photon harvesting in ultra-thin organic solar cells remains challenging due to limited optical absorption and incompletelight confinement within the active layer. In this work, a resonator-engineered microcavity architecture is introduced to enhancelight–matter interaction in non-fullerene organic solar cells based on a PM6:Y6 bulk-heterojunction absorber. The proposeddesign integrates an asymmetric dielectric–metal–dielectric (ZnO/Ag/WO 3 ) transparent electrode that simultaneously acts asa semi-reflective mirror, forming a Fabry–Pérot-type optical resonator with the metallic back contact. Optical and photovoltaiccharacteristics of the cavity-free and microcavity-integrated devices were systematically investigated using the transfer matrixmethod (TMM) for optical simulations and SCAPS-based electrical modeling. The microcavity structure reshapes the internalelectromagnetic field distribution, enabling resonance-assisted optical confinement and the formation of standing waves withinthe active layer. This resonance-driven field localization strengthens photon–matter interactions and enhances photogenerationwithout increasing the absorber’s geometric thickness. The results demonstrate that microcavity integration provides an effectivephotonic strategy to improve photon harvesting and device performance in ultra-thin organic solar cells. Such resonant photonicengineering offers a promising pathway toward high-efficiency, thin-film, and potentially semi-transparent organic photovoltaictechnologies.