TY - JOUR
T1 - Room-temperature efficient light detection by amorphous Ge quantum wells
AU - Crupi, Isodiana
AU - Cosentino, Salvatore
AU - Terrasi, Antonio
AU - Miritello, Maria
AU - Crupi, Isodiana
AU - Nicotra, Giuseppe
AU - Spinella, Corrado
AU - Simone, Francesca
AU - Mirabella, Salvatore
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10447/154922
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84876926860&partnerID=40&md5=1098f29bce688f8b692ab2f2ee112b0d
M3 - Article
VL - 8
SP - 1
EP - 7
JO - Nanoscale Research Letters
JF - Nanoscale Research Letters
SN - 1931-7573
ER -