Servicios de Caracterización

CARACTERIZACIÓN ÓPTICA Y TERAHERCIO

El grupo se dedica a la detección y emisión de radiación de terahercios a temperatura ambiente mediante el uso de transistores de tamaño submicrométrico y la caracterización de células solares (IV, CV, eficiencia cuántica …). El grupo dispone de diferentes equipos enumerados:

  • Espectrometero FTIR: Vertex 70v Rango: 8000 a 350 cm^‐1 (10-­240 THz) , Resolución: 0.16 cm^­‐1 (4.8GHz)
  • Bolómetro  de Silicio de ala prestación (4K): 600 to 10 cm^‐1 (0.3­‐18 THz)
  • Sistema de espectrosocpia en el dominio de tiempo (TDS-­‐THz) rango: 0.2-­‐3THz
  • Sistema de generación de imagenes en el rango 0.15 a 0.6 THz
  • Sistemas de detección de radiación de THz de 4 a 300K
  • Estación de puntas: Cascade PureLine/MicroChamber 11000B
  • Semiconductor Device Analyzer Keysight B1500 (4 SMUs, C‐V and transient units)
  • Simulador Solar con diferentes filtros.
  • Fuente de THz – RPG: 0.15 y 0.3 THz
  • Fuente de THz – TeraShottky: 0.075-0.6 THz
  • Fuente de láseres a Cascada Cuántica – TeraCascade: 2-5 THz
  • Detector Piroeléctrico calibrado
  • Sistema de medida de eficiencia cuántica (IQE, EQE) en el rango 200-1100nm
  • Diferentes amlificadores lock-in: SR830, SR8650, MFLI (con opción de medidas de impedancia)
  • Oscilloscopios, fuentes DC y AC, etc.

CARACTERIZACIÓN ELÉCTRICA, RUIDO Y ALTA FRECUENCIA

The laboratory of RF devices is dedicated to the characterization of semiconductor materials and sub-­‐micrometer devices up to microwave frequencies. Our tools allow performing several kinds of on­‐wafer measurements from DC and pulsed characterization, to RF and electronic noise (up to 43.5 GHz).

  • Cascade M150 probe station
  • Keithley 4200‐ SCS parameter analyzer with the ultrafast I‐V module Keithley 4225 allowing to perform pulsed measurements
  • Tektronix RSA5126A Real Time Signal Analyzer 1 Hz-­‐26.5 GHz
    (with 110 MHz acquisition BW)
  • VNA Agilent N5244A PNA­‐X with low noise receivers (option 029) for RF and noise characterization up to 43.5 GHz
  • Cryogenic Probe Stations LakShore: on-wafer DC, RF, or microwave measurements at temperatures as low as 10 K under vacuum and in fields up to 2 T  with up to 6 probe arms.

MAGNETOTRANSPORTE Y BAJAS TEMPERATURAS

We investigate fundamental and applied aspects of quantum nanodevices based on new materials as graphene and 2D related materials, topological insulators and III-V semiconductor heterostructures. Our 100% cryofree low-temperatures laboratory allows full transport and magnetotransport characterization of quantum Nanodevices from 10 miliKelvin to room temperature at high magnetic fields.

  • Cryofree Dilution Fridge, TRITON DR200,  Oxford Inst.: base temperature: 10 mK, Magnetic Field: 0-12 Tesla, Sample Holder: DIL8
  • Cryofree 3He Fridge, HELIOX ACV, Oxford Inst.: base temperature: 300 mK, continuous from 300 mK to room temperature, Magnetic Field: 0-12 Tesla, Sample Holder: DIL8
  • Cryofree Magnet, Oxford Inst ¡High Magnetic field at room temperature!, Clear Bore: 52 mm, Magnetic Field: 0-­12 Tesla
  • Full-­‐equipped laboratory for electronic transport, magneto- transport and temperature dependence: 4 SR830 Lock-­‐in amplifier

CARACTERIZACIÓN QUÍMICA, ESTRUCTURAL Y MICROSCOPÍA

We prepare and characterize new materials such as metal nanoparticles,
Quantum dots and graphene derivatives in solution and deposited onto solids.

  • Raman UV-­‐VIS-­‐NIR: LabRam HR Evolution. Laser sources: 532 nm 100 mW, 633 nm 17mW, range 770 ­‐ 795 nm > 200 mW
  • Langmuir-­‐Blodgett (KSV2000 System 2) to Fabricate and characterize
    monomolecular films with precise control of lateral packing density
  • Brewster Angle Microscopy (Optrel BAM 3000) Visualization of Langmuir monolayers or adsorbate films at the air-­‐water interface
  • Kelvin probe (KSV SPOT1) It allows determining Composition, Dissociation degree, Orientation and Interaction in Langmuir monolayers
  • Quartz Crystal Microbalance (Q-­‐sense E1). Mass changes and interactions occurring at surfaces. Surface rheology of surface bound materials.
  • Malvern Zetasizer Nano ZS to determine Molecular size, molecular weight, Particle size, Zeta potential
  • Drop (Lauda TVT 2) and maximum bubble pressure tensiometers
    (Lauda MPT2) to measure equilibrium and dynamic surface tension (from 1 ms)