RT journal article
T1 Thermally oxidized gallium nanoparticles as broadband antireflective coatings for GaAs solar cells
A1 Catalán-Gómez, S.
A1 Braza Blanco, María Verónica
A1 Ryu, Y.K.
A1 Martínez, J.
A1 González Robledo, David
A1 Hierro, A.
A1 Ulloa, J. M.
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
A2 Física Aplicada
K1 Antireflective coatings
K1 GaAs solar cells
K1 Gallium oxide nanoparticles
K1 Thermal oxidation
AB The development of efficient and scalable antireflective coatings (ARCs) remains a critical challenge for maximizing the performance of III-V solar cells. Here, we introduce a simple and robust method to fabricate gallium oxide nanoparticles (GaxOγ-NPs) as broadband ARCs via thermal oxidation of self-assembled hemispherical gallium nanoparticles (Ga-NPs) directly deposited on GaAs substrates. Complete crystalline oxidation and preservation of nanoparticle morphology are confirmed by transmission and scanning electron microscopy, ensuring the structural integrity necessary for reliable optical performance. Reflectance measurements show a ≈30 % reduction across the 280–900 nm range compared to bare GaAs. Effective medium approximation simulations, based on AFM-derived coverage and NP height profiles, reproduce the experimental eflectance spectra and validate the graded-index behavior of the nanostructured layer. When implemented on GaAs solar cells, GaxOγ-NPs yield reproducible enhancements in external quantum efficiency and short-circuit current density, with average improvements of ~10 %. Control experiments confirm that these gains arise solely from the presence of the oxidized NPs. This work establishes thermally oxidized GaxOγ-NPs as a scalable, plasmon-free ARC solution, offering compatibility with standard device processing and a promising route for light management in III–V photovoltaics.
PB Elsevier
SN 0925-3467
YR 2026
FD 2026
LK http://hdl.handle.net/10498/39402
UL http://hdl.handle.net/10498/39402
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 08-nov-2026