NDLI: High charge mobility in two-dimensional percolative networks of PbSe quantum dots connected by atomic bonds

Content Provider	PubMed Central
Author	Evers, Wiel H. Schins, Juleon M. Aerts, Michiel Kulkarni, Aditya Pierre, Capiod Berthe, Maxime Grandidier, Bruno Delerue, Christophe Zant, Herre S. J. Van Der Overbeek, Carlo Van Peters, Joep L. Daniel, Vanmaekelbergh Siebbeles, Laurens D. A.
Copyright Year	2015
Abstract	Two-dimensional networks of quantum dots connected by atomic bonds have an electronic structure that is distinct from that of arrays of quantum dots coupled by ligand molecules. We prepared atomically coherent two-dimensional percolative networks of PbSe quantum dots connected via atomic bonds. Here, we show that photoexcitation leads to generation of free charges that eventually decay via trapping. The charge mobility probed with an AC electric field increases with frequency from 150±15 cm2 V−1 s−1 at 0.2 terahertz to 260±15 cm2 V−1 s−1 at 0.6 terahertz. Gated four-probe measurements yield a DC electron mobility of 13±2 cm2 V−1 s−1. The terahertz mobilities are much higher than for arrays of quantum dots coupled via surface ligands and are similar to the highest DC mobilities reported for PbSe nanowires. The terahertz mobility increases only slightly with temperature in the range of 15–290 K. The extent of straight segments in the two-dimensional percolative networks limits the mobility, rather than charge scattering by phonons.
Related Links	http://dx.doi.org/10.1038/ncomms9195
Starting Page	8195
File Format	PDF
ISSN	20411723
e-ISSN	20411723
Journal	Nature Communications
Volume Number	6
Language	English
Publisher	Nature Pub. Group
Publisher Date	2015-09-01
Access Restriction	Open
Rights Holder	Nature Pub. Group
Subject Keyword	Biochemistry, Genetics and Molecular Biology(all) Physics and Astronomy(all) Chemistry(all) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Chemistry Physics and Astronomy Biochemistry, Genetics and Molecular Biology

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