RESUMO
The coexistence of semiconducting (2H) and metallic (1T) phases of MoS2 monolayers has further pushed their strong potential for applications in the next generation of electronic devices based on two-dimensional lateral heterojunctions. Structural defects have considerable effects on the properties of these 2D devices. In particular, the interfaces of two phases are often imperfect and may contain numerous vacancies created by phase engineering techniques, e.g. under an electron beam. Here, the transport behaviors of the heterojunctions with the existence of point defects are explored by means of first-principles calculations and non-equilibrium Green's function approach. While vacancies in semiconducting MoS2 act as scattering centers, their presence at the interface improves the flow of the charge carriers. In the case of VMo, the current has been increased by two orders of magnitude in comparison to the perfect device. The enhancement of transmission was explained by changes in the electronic densities at the T-H interface, which open new transport channels for electron conduction.
Assuntos
Anticonvulsivantes/uso terapêutico , Terapia PUVA , Fenitoína/uso terapêutico , Vitiligo/tratamento farmacológico , Adolescente , Adulto , Anticonvulsivantes/farmacologia , Criança , Método Duplo-Cego , Quimioterapia Combinada , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Fenitoína/farmacologia , Adulto JovemRESUMO
OBJECTIVE: Pityriasis lichenoides et varioliformis acuta (PLEVA) is characterized by 2-3 mm erythematous papules that became vesiculopustular with hemorrhagic necrosis. METHOD & MATERIAL: A 45-year-old lady, a known case of parathyroid adenoma, presented with a generalized itchy skin rash starting four days after radiocontrast iodide injection. RESULT: There are some reports of provocation of PLEVA by tegafur and astemizole. CONCLUSION: We report for the first time the triggering of PLEVA by radiocontrast iodide injection.
