Carrier relaxation dynamics in lead sulfide colloidal quantum dots |
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| Authors: | Istrate Emanuel Hoogland Sjoerd Sukhovatkin Vlad Levina Larissa Myrskog Stefan Smith Peter W E Sargent Edward H |
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| Institution: | Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, Canada. e.istrate@utoronto.ca |
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| Abstract: | We report transient absorption saturation measurements on lead sulfide colloidal nanocrystals at the first and second exciton energies and fit the results to a model incorporating intraband and interband relaxation processes. We study in detail the Auger recombination from the first excited state, which takes place when more than one electron-hole pair is excited in a dot. We find an Auger coefficient of 4.5 x 10(-30) cm6/s for dots of 5.5 nm diameter, and observe saturation of the absorption bleaching when the (8-fold degenerate) first level is filled. We develop a model for the absorption dynamics using Poisson statistics and find a good fit with our experimental measurements. |
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