The lead acceptor in p-type natural 2H-polytype MoS2 crystals evidenced by electron paramagnetic resonance. (12th January 2017)

• Record Type: Journal Article
• Authors: Iacovo, S; Stesmans, A; Houssa, M; Afanas'ev, V V
• Is Part Of: Journal of physics. Volume 29:Number 8(2017)
• Publication Date: 2017-01-12
• Subjects: molybdenum disulfide -- p-type doping -- lead impurity -- natural 2H MoS2; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aa5212
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: A low-temperature ( T = 1.5–8 K) electron paramagnetic resonance study of p-type 2H-polytype natural MoS2 crystals reveals a previously unreported anisotropic signal of corresponding defect density (spin S = ½) ~5 × 10 14 cm −3 . For the applied magnetic fieldB // c -axis, the response is comprised of a single central asymmetric Zeeman peak at zero-crossing g = 2.102(1), amid a symmetrically positioned hyperfine doublet of splitting 6.6(2) G. Field angular observations reveal a two-branch g pattern, indicative of a defect of lower than axial symmetry, likely orthorhombic ( C 2v ). Based on the signal specifics, it is ascribed to a system of decoupled Pb impurities substituting for Mo, the defect operating as an acceptor, with estimated thermal activation energy >10 meV. Supporting theoretical anticipation, the results pinpoint the conduct of the Pb impurity in layered MoS2 .