Projects per year
Abstract
Many envisioned applications of semiconductor nanocrystals (NCs), such as thermoelectric generators and transparent conductors, require metallic (nonactivated) charge transport across an NC network. Although encouraging signs of metallic or near-metallic transport have been reported, a thorough demonstration of nonzero conductivity, s, in the 0 K limit has been elusive. Here, we examine the temperature dependence of s of ZnO NC networks. Attaining both higher s and lower temperature than in previous studies of ZnO NCs (T as low as 50 mK), we observe a clear transition from the variable-range hopping regime to the metallic regime. The critical point of the transition is distinctly marked by an unusual power law close to s ∝ T1/5. We analyze the critical conductivity data within a quantum critical scaling framework and estimate the metal-insulator transition (MIT) criterion in terms of the free electron density, n, and interparticle contact radius, r.
Original language | English (US) |
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Article number | eaaw1462 |
Journal | Science Advances |
Volume | 5 |
Issue number | 8 |
DOIs | |
State | Published - Aug 23 2019 |
How much support was provided by MRSEC?
- Primary
Reporting period for MRSEC
- Period 6
PubMed: MeSH publication types
- Journal Article
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MRSEC IRG-2: Sustainable Nanocrystal Materials
Kortshagen, U. R., Aydil, E. S., Campbell, S. A., Francis, L. F., Haynes, C. L., Hogan, C., Mkhoyan, A., Shklovskii, B. I. & Wang, X.
9/1/98 → …
Project: Research project
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