Room-temperature efficient light detection by amorphous Ge quantum wells

Isodiana Crupi, Salvatore Cosentino, Antonio Terrasi, Maria Miritello, Isodiana Crupi, Giuseppe Nicotra, Corrado Spinella, Francesca Simone, Salvatore Mirabella

Risultato della ricerca: Articlepeer review

25 Citazioni (Scopus)

Abstract

In this work, ultrathin amorphous Ge films (2 to 30 nm in thickness) embedded in SiO2 layers were grown by magnetron sputtering and employed as proficient light sensitizer in photodetector devices. A noteworthy modification of the visible photon absorption is evidenced due to quantum confinement effects which cause both a blueshift (from 0.8 to 1.8 eV) in the bandgap and an enhancement (up to three times) in the optical oscillator strength of confined carriers. The reported quantum confinement effects have been exploited to enhance light detection by Ge quantum wells, as demonstrated by photodetectors with an internal quantum efficiency of 70%. © 2013 Cosentino et al.
Lingua originaleEnglish
pagine (da-a)1-7
Numero di pagine7
RivistaNanoscale Research Letters
Volume8
Stato di pubblicazionePublished - 2013

All Science Journal Classification (ASJC) codes

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  • ???subjectarea.asjc.3100.3104???

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