Semiconductor nanomembranes as a versatile platform to tune physical properties скачать в хорошем качестве

Semiconductor nanomembranes as a versatile platform to tune physical properties

Prof. Dr. Christoph Deneke, Gleb Wataghin Physics Institute, UNICAMP, SP - Brazil Nov 18, 2021 In the seminar, I would like to discuss the use of III-V semiconductor membranes as buildingblocks in nanotechnology by reviewing the fundamentals like the fabrication and basicproperties of membrane-based rolled-up tubes as well as flat membranes. Highlighting a recentexample, the influence of strain to the optical properties of rolled-up heterostructures has been investigated combining x-ray diffraction with photoluminescence spectroscopy and theoreticalcalculations. In the work, we have shown that not only a detailed understanding of the strain isnecessary to predict optical properties, but also that rolled-up tubes can be used to engineerthese properties in an elegant way. Moving away from three-dimensional structures formed by the release and rearrangement ofIII-V semiconductor membranes, I will briefly discuss the formation and application oftwo-dimensional, released III-V semiconductor membranes. Here, I would like to emphasize theuse as compliant or virtual substrates. For III-V membranes, we have demonstrated how such amembrane substrate influences the epitaxy of heterostructures. Moreover, we have proven thatoptical active structures can be grown on membranes and the emission is tunable by themembrane used as a virtual substrate. References: [1] N. Rodrigues, Leonarde; Scolfaro, Diego; Da Conceição, Lucas; Malachias, Angelo; Couto, Odilon D. D.; Iikawa, Fernando; Deneke, Christoph. Rolled-up Quantum Wells Composed of Nanolayered InGaAs/GaAs Heterostructures as Optical Materials for Quantum Information Technology. ACS Applied Nano Materials, v. 4, p. 3140-3147, 2021. [2] Garcia Jr., Ailton; Rodrigues, Leonarde N.; Covre da Silva, Saimon Felipe; Morelhão, Sergio L.;Couto Jr., Odilon D. D.; Iikawa, Fernando; Deneke, Christoph. In-place bonded semiconductormembranes as compliant substrates for III-V compound devices. Nanoscale, v. 11, p. 3748, 2019. Download slides of the talk here: