ORCID Profile
0000-0002-7939-0093
Current Organisation
Japan Synchrotron Radiation Research Institute
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Publisher: Elsevier BV
Date: 05-2020
Publisher: Elsevier BV
Date: 10-2020
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2018
Publisher: IEEE
Date: 12-2016
Publisher: IEEE
Date: 12-2016
Publisher: IEEE
Date: 12-2019
Publisher: AIP Publishing
Date: 17-07-2023
DOI: 10.1063/5.0156171
Abstract: We present an approach to selectively examine an asymmetric potential in the buried layer of solar cell devices by means of nonlinear x-ray spectroscopy. Detecting second harmonic generation signals while resonant to the SiO2 core level, we directly observe existence of the band bending effect in the SiO2 nanolayer, buried in the heterostructures of Al/LiF/SiO2/Si, TiO2/SiO2/Si, and Al2O3/SiO2/Si. The results demonstrate high sensitivity of the method to the asymmetric potential that determines performance of functional materials for photovoltaics or other optoelectronic devices.
Publisher: IEEE
Date: 10-2014
Publisher: Briefland
Date: 19-07-2017
DOI: 10.5812/SEMJ.57574
Publisher: Elsevier BV
Date: 07-2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2023
Publisher: MDPI AG
Date: 08-02-2023
DOI: 10.3390/APP13042176
Abstract: Ultrashort pulse X-ray free electron lasers (XFFLs) provided us with an unprecedented regime of X-ray intensities, revolutionizing ultrafast structure determination and paving the way to the novel field of non-linear X-ray optics. While pioneering studies revealed the formation of a nanoplasma following the interaction of an XFEL pulse with nanometer-scale matter, nanoplasma formation and disintegration processes are not completely understood, and the behavior of trapped electrons in the electrostatic potential of highly charged species is yet to be decrypted. Here we report the behavior of the nanoplasma created by a hard X-ray pulse interacting with xenon clusters by using electron and ion spectroscopy. To obtain a deep insight into the formation and disintegration of XFEL-ignited nanoplasma, we studied the XFEL-intensity and cluster-size dependencies of the ionization dynamics. We also present the time-resolved data obtained by a near-infrared (NIR) probe pulse in order to experimentally track the time evolution of plasma electrons distributed in the XFEL-ignited nanoplasma. We observed an unexpected time delay dependence of the ion yield enhancement due to the NIR pulse heating, which demonstrates that the plasma electrons within the XFEL-ignited nanoplasma are inhomogeneously distributed in space.
Publisher: IEEE
Date: 02-2009
Publisher: IEEE
Date: 14-12-2021
Publisher: Elsevier BV
Date: 03-2017
Publisher: Elsevier BV
Date: 02-0004
Publisher: Informa UK Limited
Date: 28-07-2017
Publisher: IEEE
Date: 12-2014
Publisher: IEEE
Date: 08-2018
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2020
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2018
No related grants have been discovered for Hyo-Sung Ahn.