Publication date: 11th July 2022
In this work we introduce THz time-domain spectroscopy (THz-TDS) as a powerful non-contact tool for the characterization of the conductivity of metallic and semiconducting organic 2D crystalline materials. In a conventional THz-TDS experiment, a freely propagating ~1THz bandwidth reference pulse which is transmitted through air (or through a bare substrate transparent to THz radiation) is compared with a pulse transmitted through a self-standing sample (or a sample deposited onto the substrate). As the THz pulse is measured in the time domain, both, the amplitude and phase changes induced by the sample can be recorded; this enables retrieving the frequency-resolved complex conductivity. Modelling the later with electrical conduction models, allows accessing important key electric parameters as the averaged scattering rate and the plasma frequency from which, carrier density and charge carrier mobility could be inferred [1].
As a demonstration of the capabilities of THz-TDS, we present here several examples of studies of conductivity in 2D-based crystalline semiconducting and metallic MOF and COF materials. In a first example, we show how localization, induced by grain boundaries in polycrystals, modifies long-range charge transport in a semiconducting sample; as a second example we show how the interplane distance between 2D-MOF layers dramatically modifies the monitored conductivity. Finally, correlations between THz-TDS characterization and conventional 2- and 4-probe methods are highlighted.
The authors would like to thank the 2021-5A/AMB-20942 - Programa de Atracción de Talento de la Comunidad de Madrid and the 20FUN03/f11 COMET – European Metrology Programme for Innovation and Research (EU). Dr. Vasileios Balos would also like to thank the Marie Skłodowska-Curie Actions programme MSCA-IF-2020-101030872 for funding.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.