Quantization of Multiparticle Auger Rates in Semiconductor Quantum Dots

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Science  11 Feb 2000:
Vol. 287, Issue 5455, pp. 1011-1013
DOI: 10.1126/science.287.5455.1011

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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.

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