Creation and Control of Two-Dimensional Electron Gas Using Al-Based Amorphous Oxides/SrTiO\(_3\) Heterostructures Grown by Atomic Layer Deposition
Citation
Lee, Sang Woon, Yiqun Liu, Jaeyeong Heo and Roy G. Gordon. 2012. Creation and control of two-dimensional electron gas using Al-based amorphous oxides/SrTiO\(_3\) heterostructures grown by atomic layer deposition. Nano Letters 12(9): 4775-4783.Abstract
The formation of a two-dimensional electron gas (2-DEG) using \(SrTiO_3\) (STO)-based heterostructures provides promising opportunities in oxide electronics. We realized the formation of 2-DEG using several amorphous layers grown by the atomic layer deposition (ALD) technique at 300°C which is a process compatible with mass production and thereby can provide the realization of potential applications. We found that the amorphous \(LaAlO_3\) (LAO) layer grown by the ALD process can generate 2-DEG \((\sim 1 × 10^{13}/cm^{2})\) with an electron mobility of \(4–5 cm^2/V·s\). A much higher electron mobility was observed at lower temperatures. More remarkably, amorphous \(YAlO_3\) (YAO) and \(Al_2O_3\) layers, which are not polar-perovskite-structured oxides, can create 2-DEG as well. 2-DEG was created by means of the important role of trimethylaluminum, \(Me_3Al\), as a reducing agent for STO during LAO and YAO ALD as well as the \(Al_2O_3\) ALD process at 300°C. The deposited oxide layer also plays an essential role as a catalyst that enables \(Me_3Al\) to reduce the STO. The electrons were localized very near to the STO surface, and the source of carriers was explained based on the oxygen vacancies generated in the STO substrate.Other Sources
http://www.chem.harvard.edu/groups/gordon/Create.Control_2D_Electron_Gas_NanoLtrs12,4775-83(2012).pdfTerms of Use
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