RT Journal Article
T1 Proving optical anisotropy and polarization effects in β-Ga2O3 nanomembranes via X-Ray excited optical luminescence
A1 Pérez Peinado, Paula
A1 Dolado, J.
A1 Alcázar Ruano, Pedro Luis
A1 Carrasco Madrigal, Daniel
A1 Martínez Casado, María Ruth
A1 Bonino, Valentina
A1 Martínez Criado, Gema
A1 Jesenovec, Jani
A1 McCloy, John S.
A1 Domínguez-Adame Acosta, Francisco
A1 Quereda, Jorge
A1 Nogales Díaz, Emilio
A1 Méndez Martín, María Bianchi
AB Monoclinic beta-Ga2O3 is a key representative material of the ultrawide-bandgap semiconductor family. The distinct atomic arrangement in beta-Ga2O3 introduces two coordination environments for Ga ions, resulting in pronounced anisotropy in its optical, electronic, and thermal properties. In this study, a synchrotron nanoprobe to investigate the anisotropic optical properties of well-oriented (100) beta-Ga2O3 nanomembranes with a thickness of 200 nm, produced through mechanical exfoliation, is employed. Polarization-resolved X-ray excited optical luminescence (XEOL) measurements reveal a strong ultraviolet (UV) emission band at 3.4 eV, which is strongly polarized along the c-axis. Additionally, XEOL data show blue (2.9 eV) and deep-UV (3.8 eV) emissions. Notably, the deep-UV band, rarely reported in conventional photoluminescence studies, is attributed to the presence of Ga vacancies, as supported by first-principles calculations. Polarization-dependent X-ray absorption near-edge structure (XANES) spectroscopy allows one to probe the distinct symmetries of the b and c crystallographic planes. Furthermore, by combining XANES and XEOL, this study investigates the site-specific contributions of Ga ions to the luminescence process. These findings highlight the potential of beta-Ga2O3 nanomembranes as a robust material platform for developing polarization-sensitive devices. The pronounced anisotropy of beta-Ga2O3 causes orientation-dependent optoelectronic properties, making it a highly promising candidate for a wide range of advanced applications
PB Wiley
SN 2699-9293
YR 2025
FD 2025
LK https://hdl.handle.net/20.500.14352/125034
UL https://hdl.handle.net/20.500.14352/125034
LA eng
NO Pérez-Peinado, P., Dolado, J., Alcázar Ruano, P.L., Carrasco, D., Martínez-Casado, R., Bonino, V., Martínez-Criado, G., Jesenovec, J., McCloy, J.S., Domínguez-Adame, F., Quereda, J., Nogales, E. and Méndez, B. (2025), Proving Optical Anisotropy and Polarization Effects in β-Ga2O3 Nanomembranes via X-Ray Excited Optical Luminescence. Adv. Photonics Res., 6: 2500043. https://doi.org/10.1002/adpr.202500043
NO © 2025 The Author(s)FA8655-20-1-7013
NO Comunidad de Madrid
NO European Commission
NO Agencia Estatal de Investigación  (España)
NO Ministerio de Ciencia e Innovación (España)
NO Universidad Complutense de Madrid
NO Air Force Research Laboratory (US)
NO European Synchrotron Radiation Facility
DS Docta Complutense
RD 19 oct 2025