TY - JOUR
T1 - Nanoscale compositional fluctuations in single InGaAs/GaAs quantum dots
AU - De Giorgi, M.
AU - Passaseo, A.
AU - Rinaldi, R.
AU - Johal, T.
AU - Cingolani, R.
AU - Taurino, A.
AU - Catalano, M.
AU - Crozier, Peter
PY - 2001/3/1
Y1 - 2001/3/1
N2 - We report the first investigation of compositional disorder in quantum dots with subnanometer precision. We have investigated the compositional profile of a single InGaAs/GaAs quantum dot, of nominal In content x = 0.5, by using energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), and atomic force and scanning tunneling microscope (AFM-STM) topography. The compositional analysis at nanoscale reveals a number of unexpected features: (i) In enrichment of the centre of the dot (about 65% In content); (ii) In diffusion outside the dot contour; (iii) In depletion of the wetting layer in the surrounding of the dot.
AB - We report the first investigation of compositional disorder in quantum dots with subnanometer precision. We have investigated the compositional profile of a single InGaAs/GaAs quantum dot, of nominal In content x = 0.5, by using energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), and atomic force and scanning tunneling microscope (AFM-STM) topography. The compositional analysis at nanoscale reveals a number of unexpected features: (i) In enrichment of the centre of the dot (about 65% In content); (ii) In diffusion outside the dot contour; (iii) In depletion of the wetting layer in the surrounding of the dot.
UR - http://www.scopus.com/inward/record.url?scp=0035583678&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035583678&partnerID=8YFLogxK
U2 - 10.1002/1521-3951(200103)224:1<17::AID-PSSB17>3.0.CO;2-Z
DO - 10.1002/1521-3951(200103)224:1<17::AID-PSSB17>3.0.CO;2-Z
M3 - Article
AN - SCOPUS:0035583678
SN - 0370-1972
VL - 224
SP - 17
EP - 20
JO - Physica Status Solidi (B) Basic Research
JF - Physica Status Solidi (B) Basic Research
IS - 1
ER -