Free Standing YBaCuO Uncooled IR Detectors

1
Y-Ba-Cu-O Properties

• YBa2Cu3O6x best known as high-Tc superconductor
• Y-Ba-Cu-O as we use it has 11.536-7
  stoichiometry
• Semiconductor-like Fermi glass (Yu-Heeger Model)
• Thermally Activated Transport EA EF-Ec 0.2 -
  0.3 eV
• Charge Transfer Gap (CTG) 1.5-1.37 eV (lc 827
  - 906 nm)

Vacant/Extended States
Cu3d UHB
Localized States
CTG
EF
Ec
O2p LHB
Occupied/Extended States
2
Y-Ba-Cu-O Properties

• Prepared by RF magnetron sputtering at ambient
  temperature from a single composite target
• polycrystalline to amorphous with grain size lt 10
  nm (nanocrystalline)
• TCR gt 3/K at 295 K
• Resistivity 1-10 W-cm
• Ferroelectric/Pyroelectric er
  87-500
• processing CMOS compatible and friendly to
  micromachining

Vacant/Extended States
Cu 3d UHB
CTG
Localized States
EF
Ec
O 2p LHB
Occupied/Extended States
3
X-ray Diffraction of Y-Ba-Cu-O
Amorphous Y-Ba-Cu-O
Tetragonal YBa2Cu3O6x
4
Transport in Y-Ba-Cu-O
Amorphous Y-Ba-Cu-O
Tetragonal YBa2Cu3O6x
Mott variable range hopping
Activated transport
5
Mobility and Resistivity Comparison
6
TCR vs. Hall Carrier Concentration