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Detailed photoluminescence studies of thin film Cu₂S for determination of quasi-Fermi level splitting and defect levels

Sträter, Hendrik ; Brüggemann, R. ; Siol, S. ; Klein, Andreas ; Jaegermann, Wolfram ; Bauer, G. H. (2021)
Detailed photoluminescence studies of thin film Cu₂S for determination of quasi-Fermi level splitting and defect levels.
In: Journal of Applied Physics, 2013, 114 (23)
doi: 10.26083/tuprints-00019912
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Item Type: Article
Type of entry: Secondary publication
Title: Detailed photoluminescence studies of thin film Cu₂S for determination of quasi-Fermi level splitting and defect levels
Language: English
Date: 2021
Place of Publication: Darmstadt
Year of primary publication: 2013
Publisher: AIP Publishing
Journal or Publication Title: Journal of Applied Physics
Volume of the journal: 114
Issue Number: 23
Collation: 8 Seiten
DOI: 10.26083/tuprints-00019912
Corresponding Links:
Origin: Secondary publication service
Abstract:

We have studied chalcocite (Cu₂S) layers prepared by physical vapor deposition with varying deposition parameters by calibrated spectral photoluminescence (PL) and by confocal PL with lateral resolution of Δ x≈0.9 μm. Calibrated PL experiments as a function of temperature T and excitation fluxes were performed to obtain the absolute PL-yield and to calculate the splitting of the quasi-Fermi levels (QFLs) μ=Ef,n−Ef,p at an excitation flux equivalent to the AM 1.5 spectrum and the absorption coefficient α(ℏω), both in the temperature range of 20 K≤T≤400 K. The PL-spectra reveal two peaks at E#1=1.17 eV and E#2=1.3 eV. The samples show a QFL-splitting of μ>700 meV associated with a pseudo band gap of Eg=1.25 eV. The high-energy peak shows an unexpected temperature behavior, namely, an increase of PL-yield with rising temperature at variance with the behavior of QFL-splitting that decreases with rising T.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-199128
Classification DDC: 500 Science and mathematics > 530 Physics
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 16 Nov 2021 12:30
Last Modified: 25 Jan 2023 07:57
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19912
PPN: 504041975
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