Observation of resonant exciton and correlated plasmon yielding correlated plexciton in amorphous silicon with various hydrogen content.

Autor: Prayogi S; Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia.; Department of Electrical Engineering, Pertamina University, Jakarta, 12220, Indonesia., Asih R; Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia., Priyanto B; Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia., Baqiya MA; Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia., Naradipa MA; Department of Physics, National University of Singapore, Singapore, 117542, Singapore., Cahyono Y; Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia., Darminto; Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia. darminto@physics.its.ac.id., Rusydi A; Department of Physics, National University of Singapore, Singapore, 117542, Singapore. andrivo.rusydi@nus.edu.sg.; Singapore Synchrotron Light Source, 5 Research Link, Singapore, 117603, Singapore. andrivo.rusydi@nus.edu.sg.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2022 Dec 13; Vol. 12 (1), pp. 21497. Date of Electronic Publication: 2022 Dec 13.
DOI: 10.1038/s41598-022-24713-5
Abstrakt: Hydrogenated amorphous silicon (a-Si: H) has received great attention for rich fundamental physics and potentially inexpensive solar cells. Here, we observe new resonant excitons and correlated plasmons tunable via hydrogen content in a-Si: H films on Indium Tin Oxide (ITO) substrate. Spectroscopic ellipsometry supported with High Resolution-Transmission Electron Microscopy (HR-TEM) is used to probe optical properties and the density of electronic states in the various crystallinity from nano-size crystals to amorphous a-Si: H films. The observed optical and electronic structures are analyzed by the second derivative with analytic critical-point line shapes. The complex dielectric function shows good agreement with microscopic calculations for the energy shift and the broadening inter-band transitions based on the electron-hole interaction. Interestingly, we observe an unusual spectral weight transfer over a broad energy range revealing electronic correlations that cause a drastic change in the charge carrier density and determine the photovoltaic performance. Furthermore, the interplay of resonant excitons and correlated plasmons is discussed in term of a correlated plexciton. Our result shows the important role of hydrogen in determining the coupling of excitons and plasmons in a-Si: H film for photovoltaic devices.
(© 2022. The Author(s).)
Databáze: MEDLINE
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