Thin layer interference effects on optical properties of layered BiI<sub>3</sub>

ORAL

Abstract

When precise measurement of optical properties in very thin systems, such as 2D materials, is required, thin layer interference effects play a crucial role. This is particularly important when a thickness-dependent characterization is needed. Contrary to intuition, these kind of effects can take place even when the investigated thicknesses are well below the probing wavelength scale.

In our work we have studied the layer-dependent optical properties of the archetypal 2D semiconductor BiI3, with thicknesses varying from the monolayer to the mesoscale. This material is of high interest for possible applications in optoelectronics, photovoltaics and X-Ray detection systems.

This study, based on transmission and photoluminescence measurements, allowed us to estimate how a strongly bound exciton in the material causes a giant stokes shift. A parallel thin layer interference analysis allowed us to disentangle the intrinsic material properties from simple optical effects in the measured phenomena.

*The project that gave rise to these results received the financial support of a fellowship from the "la Caixa" Foundation (ID No. 100010434, fellowship code LCF/BQ/DI22/11940022) and Grants No. PID2020-118938GA-100 from (MICINN), the European Research Council (ERC) under the Horizon 2020 research and innovation program (ERC StG, Grant Agreement No. 803092), MICINN and the European Union NextGenerationEU from the Ramon y Cajal program (Grants No. RYC2018-024736-I and No. RYC2021-034609-I), the Spanish Unidad de Excelencia "María de Maeztu" (Grant No. CEX2019-000919-M) and the Advanced Materials program supported by MICINN with funding from European Union NextGenerationEU (PRTR-C17.I1) and by Generalitat Valenciana.

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Presenters

  • Filippo Mione

    • Universitat de Valencia

Authors

  • Filippo Mione

    • Universitat de Valencia

  • Daniel Brown

    • Universitat de Valencia

  • Ivona Kosic

    • Universitat de València
    • Universitat de Valencia

  • Jorge Cervantes-Villanueva

    • University de Valencia
    • University of Valencia
    • Universitat de Valencia

  • Marta Galbiati

    • University de Valencia
    • Universitat de Valencia

  • Fernando Ramiro Manzano

    • Universitat politecnica de Valencia

  • Alejandro Molina-Sanchez

    • University de Valencia
    • Universitat de Valencia

  • Efren A Navarro-Moratalla

    • Univ de Valencia
    • Universitat de Valencia