期刊
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
卷 212, 期 7, 页码 1487-1493出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201532032
关键词
BaSnO3; donors; doping; oxygen diffusion; Hall effect
资金
- National Creative Research Initiative through the NRF of Korea - Ministry of Education, Science and Technology [2010-0018300]
- National Research Foundation of Korea [2010-0018300] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We investigate the oxygen diffusion phenomena in a Ba0.96La0.04SnO3 (BLSO) thin film on SrTiO3(001) substrate by measurements of time-dependent Hall effect at high temperatures around 500 degrees C under different gas atmosphere. Under the Ar (O-2) atmosphere, carrier density (n) and electrical conductivity (sigma) are increased (decreased) while electron mobility (mu) is slightly reduced (enhanced). This observation supports that although both n and mu are affected by the oxygen diffusion process, the change of n is a major factor of determining s in the BLSO film. Detailed analyses of the time-dependent n exhibit fast and slow dynamics that possibly correspond to the oxygen exchange reaction at the surface and oxygen diffusion into the BLSO grains, respectively. Fitting the time dependence of n reveals that the chemical diffusion coefficient of oxygen in the BLSO grains becomes similar to 10(-16)cm(2) s(-1). This coefficient marks the lowest value among perovskite oxides around 500 degrees C, directly proving excellent thermal stability of oxygen in BLSO. The present results support that the donor-doped BaSnO3 system could be useful for realizing transparent semiconductor devices at high temperatures. (C) 2015 WILEY - VCH Verlag GmbH & Co. KGaA, Weinheim
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