Regensburg 2019 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 35: HL Poster II
HL 35.52: Poster
Wednesday, April 3, 2019, 17:30–20:00, Poster E
Conductive nanorods generated by Cu exchange on contacted CdSe/CdS-rods — •Benedikt Brechtken1, Franziska Lübkemann2, Dirk Dorfs2, Nadja Bigall2, and Rolf J. Haug1 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, 30167 Hannover — 2Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, 30167 Hannover
The classical fabrication procedures for electrical devices reaches their limits in miniaturization. The incorporation of chemical methods in the fabrication could be a way of surpassing those limits.
Chemical bottom up processes can create CdSe/CdS-nanorods with 5 nm diameter and 80 nm length. Single nanorods are individually contacted with electron beam lithography. To increase the measureable current in some cases a small number of rods are contacted in parallel by Cr/Au-contacts.
With the chemical cation exchange Cd can be replaced by Cu in these nanorods [1]. This transforms CdS with a resistivity around 10^12 Ωcm [2] to CuS which has a 15 orders of magnitude lower resistivity [3]. This method is applied to already contacted nanorods. These rods are electrically measured under ambient conditions. By measuring the same rods before and after the exchange, a drastic decrease in resistance is observed. The resulting resistance is stable for at least 14 days.
[1] B. Sadler et. al., J. AM. CHEM. SOC. 131, (2009)
[2] R. H. Bube, S.M.Thomsen, J. of Chemical Physics 23, (1955)
[3] M. Najdoski et al., J. of Solid State Chemistry 114, (1995)