In MoS2 monolayers, bismuth contacts create a new photoluminescence band at about 1.86 eV that the authors attribute to bismuth-related acceptor defects, and grounding the contacts suppresses the pre-existing defect emission.
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The impact of electrical contacts on the optical properties of a MoS$_{2}$ monolayer
In MoS2 monolayers, bismuth contacts create a new photoluminescence band at about 1.86 eV that the authors attribute to bismuth-related acceptor defects, and grounding the contacts suppresses the pre-existing defect emission.