Open AccessDiffraction-optimized aperiodic surface structures for enhanced current density in organic solar cells
Author(s) -
Milena Merkel,
Jörg Imbrock,
Cornélia Denz
Publication year - 2022
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.465177
Subject(s) - aperiodic graph , diffraction , optics , diffraction grating , spiral (railway) , materials science , grating , diffraction efficiency , phase (matter) , azimuth , physics , mathematics , mathematical analysis , combinatorics , quantum mechanics
Novel diffractive surface structures are designed, evaluated, and optimized to achieve a significant increase in current density in organic solar cells. The surface relief phase gratings are patterned based on concentric rings, a Fermat's spiral, and an Archimedean spiral, respectively, and thus diffract incident light independent of its azimuthal angle, as they all exhibit circularly symmetric diffraction patterns. The grating pillars are arranged on the rings or spirals according to periodic or deterministic aperiodic Thue-Morse and Rudin-Shapiro sequences, tailoring the desired diffraction patterns. After evaluating the surface patterns against each other and further parameter optimization, a final current density enhancement of 5 % is achieved for one of the most promising patterns, the Thue-Morse sequence on an Archimedean spiral.