HgCdTe energy gap determination from photoluminescence and spectral response measurements

• Autorzy: Murawski Krzysztof , Kopytko Małgorzata , Madejczyk Paweł , Majkowycz Kinga , Martyniuk Piotr

Identyfikatory

DOI

10.24425/mms.2023.144395

• Języki publikacji: EN

Abstrakty

EN

The temperature dependence of photoluminescence spectra has been studied for the HgCdTe epilayer. At low temperatures, the signal has plenty of band-tail states and shallow/deep defects which makes it difficult to evaluate the material bandgap. In most of the published reports, the photoluminescence spectrum containing multiple peaks is analyzed using a Gaussian fit to a particular peak. However, the determination of the peak position deviates from the energy gap value. Consequently, it may seem that a blue shift with increasing temperature becomes apparent. In our approach, the main peak was fitted with the expression proportional to the product of the joint density of states and the Boltzmann distribution function. The energy gap determined on this basis coincides in the entire temperature range with the theoretical Hansen dependence for the assumed Cd molar composition of the active layer. In addition, the result coincides well with the bandgap energy determined on the basis of the cut-off wavelength at which the detector response drops to 50% of the peak value.

Słowa kluczowe

EN

infrared detectors; HgCdTe; photoluminescence; spectral responsivity; semiconductor energy gap

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2023
• Tom: Vol. 30, nr 1
• Strony: 183--194
• Opis fizyczny: Bibliogr. 26 poz., rys., wykr., wzory

Twórcy

autor

Murawski Krzysztof

• Military University of Technology, Institute of Applied Physics, 2 Kaliskiego St., 00-908 Warsaw, Poland

• https://orcid.org/0000-0003-2736-0973

autor

Kopytko Małgorzata

• Military University of Technology, Institute of Applied Physics, 2 Kaliskiego St., 00-908 Warsaw, Poland

• https://orcid.org/0000-0002-5838-3310

autor

Madejczyk Paweł

• Military University of Technology, Institute of Applied Physics, 2 Kaliskiego St., 00-908 Warsaw, Poland

• https://orcid.org/0000-0002-0106-7931

autor

Majkowycz Kinga

• Military University of Technology, Institute of Applied Physics, 2 Kaliskiego St., 00-908 Warsaw, Poland

• https://orcid.org/0000-0002-5361-6410

autor

Martyniuk Piotr

• Military University of Technology, Institute of Applied Physics, 2 Kaliskiego St., 00-908 Warsaw, Poland

• https://orcid.org/0000-0003-1963-3521

Bibliografia

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Uwagi

1. This work was financed by the National Centre for Research and Development (Poland), Grant no. RPMA.01.02.00-14/b451/18.

2. Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).