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SUMMARY:Probing hydrogen sites and negative hyperfine parameter in semicon
 ducting BaSi2 by muon spin rotation
DTSTART;VALUE=DATE-TIME:20220901T130000Z
DTEND;VALUE=DATE-TIME:20220901T132000Z
DTSTAMP;VALUE=DATE-TIME:20220826T121654Z
UID:indico-contribution-3636@indico.stfc.ac.uk
DESCRIPTION:Speakers: Kenji Kojima (TRIUMF and SBQMI\, UBC)\nHydrogen pass
 ivation of defects is commonly used to reduce defects in semiconductors su
 ch as GaAs\, diamond\, and Si. We recently found by experiment that atomic
  hydrogen is also very effective in significantly increasing a minority-ca
 rrier lifetime (> 10 μs) in BaSi2\, one of the emerging materials for thi
 n-film solar cell applications. This means that defects no longer act as r
 ecombination centers in BaSi2 after hydrogen passivation [1-2]. But three 
 has been no experimental data about the hydrogen site in BaSi2. We employe
 d muons to study the hydrogen state in single-crystalline BaSi2. Distinct 
 neutral muonium state was identified in the high transverse-field measurem
 ents. From the temperature dependence\, negative hyperfine parameters was 
 suggested. From the angle-dependence of the hyperfine parameter in the mag
 netic fields applied in the a x b\, b x c\, and c x a planes\, and compari
 son to the calculations based on density-functional theory (DFT)\, the hyd
 rogen site in the BaSi2 crystal is proposed.\n[1] Z. Xu et al.\, Phys. Rev
 . Mater. 3\, 065403 (2019).\n[2] X. Xu et al.\, J. Appl. Phys. 127\, 23310
 4 (2020).\n\nhttps://indico.stfc.ac.uk/event/53/contributions/3636/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3636/
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