Journal
CHEMICAL PHYSICS
Volume 471, Issue -, Pages 81-88Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2015.07.031
Keywords
Time-resolved microwave conductivity; Quantum dot; Doping; Spectroscopy; Optoelectronic; Lead selenide
Funding
- U.S. Department of Energy Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-SC0002158]
- National Science Foundation Graduate Research Fellowship [DGE-1321851]
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We used flash-photolysis, time-resolved microwave conductivity (TRMC) to probe the carrier mobility and lifetime in PbSe quantum dot (QD) thin films treated with solutions of the metal salts of Na2Se and PbCl2. The metal salt treatments tuned the Pb:Se stoichiometry and swept the Fermi energy throughout the QD thin film bandgap. A stoichiometric imbalance favoring excess Se heavily p-doped the QD thin film, shifted the Fermi energy toward the valence band, and yielded the highest TRMC mobility and lifetime. Introducing Pb first compensated the p-doping and shifted the Fermi level through mid-gap, decreasing the TRMC mobility. Further Pb addition created an excess of Pb, n-doped the QD thin film, moved the Fermi level to near the conduction band, and again increased the TRMC mobility. The increase in TRMC mobility as the Fermi energy was shifted toward the band edges by non-stoichiometry is consistent with the QD thin film density of states. (C) 2015 Elsevier B. V. All rights reserved.
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