Effect of buffer termination on intermixing and conductivity in LaTiO3/SrTiO3 heterostructures integrated on Si(100)

Chen, Tongjie; Ahmadi-Majlan, Kamyar; Lim, Zheng Hui; Zhang, Zhan; Ngai, Joseph H.; Kumah, Divine P.

doi:10.1116/6.0001464

Title: Effect of buffer termination on intermixing and conductivity in LaTiO₃/SrTiO₃ heterostructures integrated on Si(100)

Journal Article · Thu Dec 02 00:00:00 EST 2021 · Journal of Vacuum Science and Technology A

DOI:https://doi.org/10.1116/6.0001464· OSTI ID:1846807

Chen, Tongjie ^[1]; Ahmadi-Majlan, Kamyar ^[2]; Lim, Zheng Hui ^[2]; Zhang, Zhan ^[3]; Ngai, Joseph H. ^[2];

^[1]

North Carolina State Univ., Raleigh, NC (United States)
Univ. of Texas-Arlington, TX (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)

Here, the control of chemical exchange across heterointerfaces formed between ultrathin functional transition-metal oxide layers provides an effective route to manipulate the electronic properties of these systems. By determining the layer-resolved structural profile across the interface between the Mott insulator, LaTiO₃ (LTO) grown epitaxially on SrTiO₃ (STO)-buffered silicon by molecular beam epitaxy, we find that interfacial cationic exchange depends on the surface termination of the strained STO buffer. Using a combination of temperature-dependent transport and synchrotron x-ray crystal truncation rods and reciprocal space mapping, an enhanced conductivity in STO/LTO/SrO-terminated STO buffers compared to heterostructures with TiO₂-terminated STO buffers is correlated with La/Sr exchange and the formation of metallic La_1-xSr_xTiO₃. La/Sr exchange effectively reduces the strain energy of the system due to the large lattice mismatch between the nominal oxide layers and the Si substrate.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1846807

Alternate ID(s):: OSTI ID: 1833765

Journal Information:: Journal of Vacuum Science and Technology A, Vol. 40, Issue 1; ISSN 0734-2101

Publisher:: American Vacuum Society / AIPCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Title: Effect of buffer termination on intermixing and conductivity in LaTiO3/SrTiO3 heterostructures integrated on Si(100)

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Title: Effect of buffer termination on intermixing and conductivity in LaTiO₃/SrTiO₃ heterostructures integrated on Si(100)