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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. (Publisher's Version)
In: Journal of Applied Physics, 114 (23), AIP Publishing, ISSN 0021-8979, e-ISSN 1089-7550,
DOI: 10.26083/tuprints-00019912,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Detailed photoluminescence studies of thin film Cu₂S for determination of quasi-Fermi level splitting and defect levels
Language: English
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.

Journal or Publication Title: Journal of Applied Physics
Journal volume: 114
Number: 23
Publisher: AIP Publishing
Collation: 8 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 16 Nov 2021 12:30
Last Modified: 16 Nov 2021 12:31
DOI: 10.26083/tuprints-00019912
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-199128
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19912
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