Journal
ACS NANO
Volume 7, Issue 8, Pages 6774-6781Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn401657n
Keywords
quantum dot solids; electrical transport; optical properties; coupling
Categories
Funding
- Self-Assembly of Organic/Inorganic Nanocomposite Materials program [DE-AC02-05CH11231]
- Director, Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
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We present a facile procedure to fabricate p-type PbSe-based quantum dot solids with mobilities as large as 0.3 cm(2) V-1 s(-1). Upon partial ligand exchange of oleate-capped PbSe quantum dots with the methoxide ion, we observe a pronounced red shift in the excitonic transition in conjunction with a large increase in conductivity. We show that there is little correlation between these two phenomena and that the electronic coupling energy in PbSe quantum dot solids is much smaller than often assumed. However, we observe for the Hist time a nonmonotonic size dependence of the hole mobility, illustrating that coupling can nonetheless be dominant in determining the transport characteristics. We attribute these effects to a decrease in charging energy and interparticle spacing leading to enhanced electronic coupling on one hand and enhanced dipole interactions on the other hand, which is held responsible for the majority of the red shift.
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