1 / 14

Eva Repiso Menendez

Eva Repiso Menendez. Growth and hydrogenation of Sb/N materials for high efficiency mid-IR LEDs in pollutant gas detection. Personal background Bachelor in Physics Oviedo University 4 months in Italian National Laboratory TASC Project: Self-assisted n-type GaAs nanowires grown by MBE.

sernie
Download Presentation

Eva Repiso Menendez

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Eva Repiso Menendez Growth and hydrogenation of Sb/N materials for high efficiency mid-IR LEDs in pollutant gas detection

  2. Personal background Bachelor in Physics Oviedo University 4 months in Italian National Laboratory TASC Project: Self-assisted n-type GaAs nanowires grown by MBE M. Orru, E. Repiso et al. Adv. Funct. Mater. 26, 2836-2845 (2016)

  3. Personal background Masters in Energies and Fuels for the future AutonomaUniveristy of Madrid 6 months part time in Crystal Growth Laboratory Project: Simulation and growth in volume of CdZnTe single crystals CrysMAS simulation of a Vertical Gradient Freeze furnace

  4. WP 4 – Materials for environment (Eva Lancs., Mario Mont., Davide Nott.) Growth and hydrogenation of Sb/N materials for high efficiency mid-IR LEDs in pollutant gas detection Motivation for MIR LEDs gas detection CH4, CO2, CO…. - environmental pollution monitoring - optical gas sensing - chemical process control - medical diagnosis

  5. Mid-IR LED output power • Background – Mid-IR LEDs • Main challenges • Auger, SRH non-radiative recombination • Optical extraction • Approaches • Sb nanostructures QW & QD • Dilute N LED based CO2 gas sensor GSS Ltd.

  6. Experimental Techniques – skills acquired

  7. Results InAsSb/InAlAs type-I MQW Band diagram at 0 K Sample structure Electroluminescence with temperature I-V measurements of LEDs CO2 absorption

  8. Results InAsSb/InAlAs MQW Hydrogenated 90 K Electroluminescence dependence on hydrogenation dose 300 K Electroluminescence dependence on hydrogenation dose CO2 absorption CO2 absorption

  9. Results InAsSb/InAlAs MQW Hydrogenated 90K Electroluminescence dependence on hydrogenation dose Peak intensity Peak wavelength

  10. Results InSb/InAs type-II QDs InSb deposition time determines QDs size InAs cap temperature influences size and intermixing InAs @470°C InSb @430°C + InAs cap InAs @430°C Mono Layers of QDs from XRD InAs InSb QDs

  11. Summary LEDs grown containing strained InAs0.90Sb0.10 QWs Characterisation shows EL up to RT First hydrogenated mid-IR LEDs PL samples grown containing InSb QDs Shift in λ emission due to the cold cap Work in progress Effects of the cold cap on QDs morphology and defects TEM at UCA (Atif Khan) Hydrogenation at Sapienza University -Rome Band engineering InAsSb/InAlAs enables better targeting the λ Dilute N MBE

  12. Skills acquired

  13. Outputs • Talks at Networks • 1st WebEx meeting (March 2016) • Growth and hydrogenation of Sb/N materials for high efficiency mid-IR LEDs in pollutant gas detection • Speaker: Eva Repiso • b) Talk at PROMIS conference (Cadiz, April 2016) • InSb QDs for high efficiency mid-IR LEDs • Speaker: Eva Repiso • Posters • a) 19th International MBE conference (Montpellier, Sept. 2016) • InSb QDs for mid-IR LEDs • Authors: E. Repiso, P. J. Carrington, A. Marshall, Q. Lu and A.Krier • Outreach • Webcast on Photonics • Day of Photonics, photos through Twitter

  14. Future aspirations Publish high impact papers; Present talks at international conferences; Mirsens 4th (May 2017) UK semiconductors (June 2017) SPIE optics+photonics (August 2018) 20th International MBE conference (Sept 2018) Postdoc Fellowship application Academic/Industry career

More Related