Quantization of multiparticle auger rates in semiconductor quantum dots
We have resolved single-exponential relaxation dynamics of the 2-, 3-, and 4-electron-hole pair states in nearly monodisperse cadmium selenide quantum dots with radii ranging from 1 to 4 nanometers. Comparison of the discrete relaxation constants measured for different multiple-pair states indicates that the carrier decay rate is cubic in carrier concentration, which is characteristic of an Auger process. We observe that in the quantum-confined regime, the Auger constant is strongly size-dependent and decreases with decreasing the quantum dot size as the radius cubed.
Klimov
VI
Chemical Science and Technology Division, CST-6, MS-J585, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. Department of Chemistry and Center for Materials Science and Engineering, Massachusetts Institute of Technology, 77 Mass.
Mikhailovsky
AA
McBranch
DW
Leatherdale
CA
Bawendi
MG