Tuning the inter-shell splitting in self-assembled CdTe quantum dots

K. Kuklinski , L. Klopotowski , K. Fronc , M. Wiater , P. Wojnar (1) , P. Rutkowski , Valia Voliotis (2) , R. Grousson (2) , G. Karczewski (1) , J. Kossut (1) , T. Wojtowicz (1)

1 Institute of Physics
2 INSP - Institut des Nanosciences de Paris

We present photoluminescence studies of highly excited single self-assembled CdTe quantum dots under continuous-wave and pulsed excitations. We observe appearance of emission bands related to sequential filling of s-, p- and d-shells. We analyze the inter-shell splitting for five samples, in which the dots were formed from a strained CdTe layer of different width. We find that by increasing the CdTe layer width, the inter-shell splitting increases. In a time resolved measurement, we observe a radiative cascade between transitions involving one, two, and more than two excitons. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3643476]

Mots clés: cadmium compounds; excitons; II-VI semiconductors; photoluminescence; self-assembly; semiconductor quantum dots

Domaines: Matière Condensée [cond-mat]

K. Kuklinski, L. Klopotowski, K. Fronc, M. Wiater, P. Wojnar, et al.. Tuning the inter-shell splitting in self-assembled CdTe quantum dots. Applied Physics Letters, 2011, 99 (14), ⟨10.1063/1.3643476⟩. ⟨hal-01229207⟩