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Publication Citation: Time-resolved photoluminescence of lithographically defined quantum dots fabricated by electron beam lithography and wet chemical etching

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Author(s): Varun B. Verma; Martin J. Stevens; Kevin L. Silverman; Neville Dias; Akash Garg; James J. Coleman; Richard P. Mirin;
Title: Time-resolved photoluminescence of lithographically defined quantum dots fabricated by electron beam lithography and wet chemical etching
Published: June 15, 2011
Abstract: We measure the time-resolved photoluminescence characteristics of a novel type of lithographically patterned quantum dot fabricated by electron beam lithography, wet chemical etching, and overgrowth of the barrier layers by metalorganic chemical vapor deposition.We find that the quantum dot (QD) photoluminescence exhibits a bi-exponential decay that we explain in terms of the fast capture of carriers by defect states followed by a slower radiative relaxation process. We also perform a systematic investigation of the rise time and decay time as a function of the QD density, size, and temperature. These measurements indicate that the carrier capture process in this type of QD is limited by carrier drift within the GaAs barrier material.
Citation: Journal of Applied Physics
Volume: 109
Issue: 12
Pages: 10 pp.
Keywords: quantum dot; time resolved photoluminescence
Research Areas: Electron beam lithography (EBL), Characterization, Nanophotonics
DOI: http://dx.doi.org/10.1063/1.3599889  (Note: May link to a non-U.S. Government webpage)
PDF version: PDF Document Click here to retrieve PDF version of paper (4MB)