Article

Journal of Electronic Materials

, Volume 41, Issue 3, pp 524-529

Annealing-Induced Morphological Changes in Nanocrystalline Quantum Dots and Their Impact on Charge Transport Properties

  • Sushmita BiswasAffiliated withAir Force Research Laboratory, 2941 Hobson Way, Wright Patterson Air Force Base
  • , David J. GosztolaAffiliated withCenter for Nanoscale Materials, Argonne National Laboratory
  • , Gary P. WiederrechtAffiliated withCenter for Nanoscale Materials, Argonne National Laboratory
  • , Michael A. StroscioAffiliated withDepartment of Electrical and Computer Engineering, University of Illinois at ChicagoDepartment of Bioengineering, University of Illinois at ChicagoDepartment of Physics, University of Illinois at Chicago
  • , Mitra DuttaAffiliated withDepartment of Electrical and Computer Engineering, University of Illinois at ChicagoDepartment of Physics, University of Illinois at Chicago Email author 

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Abstract

The effects of thermal annealing on the morphological and photoconductive properties of cadmium selenide quantum dots coated with zinc sulfide are studied. The results of transmission electron microscopy with in situ annealing show a number of events taking place simultaneously, including aggregation of dots, changes in the size and shape distribution, and reduction in interdot separation. Transient absorption results indicate that there is a small redshift of the spectrum. There is a shortening of the absorption decay lifetimes due to annealing. Higher photocurrents are measured in the annealed compared with unannealed dots at room temperature.

Keywords

Quantum dots annealing cadmium selenide charge transport morphology