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Buffer layer-less fabrication of a high-mobility transparent oxide semiconductor, La-doped BaSnO3

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Title: Buffer layer-less fabrication of a high-mobility transparent oxide semiconductor, La-doped BaSnO3
Authors: Sanchela, Anup V. Browse this author
Wei, Mian Browse this author
Lee, Joonhyuk Browse this author
Kim, Gowoon Browse this author
Jeen, Hyoungjeen Browse this author
Feng, Bin Browse this author
Ikuhara, Yuichi Browse this author
Cho, Hai Jun Browse this author
Ohta, Hiromichi Browse this author →KAKEN DB
Issue Date: 21-May-2019
Publisher: Royal Society of Chemistry
Journal Title: Journal of materials chemistry C
Volume: 7
Issue: 19
Start Page: 5797
End Page: 5802
Publisher DOI: 10.1039/c8tc06177g
Abstract: La-Doped BaSnO3 (LBSO) is one of the most promising transparent oxide semiconductors because its single crystal exhibits high electron mobility; therefore, it has drawn significant attention in recent years. However, in the LBSO films, it is very hard to obtain high mobility due to threading dislocations, which are caused by the lattice mismatch between the film and the substrate. While previous studies have reported that insertion of buffer layers increases the electron mobilities; this approach leaves much to be desired since it involves a two-step film fabrication process, and the enhanced mobility values are still significantly lower than the single crystal values. Thus, herein, we show that the electron mobility of the LBSO films can be improved without the insertion of any buffer layers if the films are grown under highly oxidative ozone (O-3) atmospheres. The O-3 environment relaxes the LBSO lattice and reduces the formation of the Sn2+ states, which are known to suppress the electron mobility in LBSO. The resultant O-3-LBSO films show improved mobility values up to 115 cm(2) V-1 s(-1), which are among the highest values reported for the LBSO films on SrTiO3 substrates and comparable to those of the LBSO films with buffer layers.
Type: article (author version)
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 太田 裕道

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