Infrared reflectance of polypyrrole: ‘metal’ with a gap in the spectrum of charged excitations

We report reflectance measurements of polypyrrole films with d.c. conductivity of 350 S/cm at 300 K

Kwanghee Lee; M. Reghu; E.L. Yuh; N.S. Sariciftci; A.J. Heeger

2002

Scholarcy highlights

  • We report reflectance measurements of polypyrrole films with d.c. conductivity of 350 S/cm at 300 K
  • At 10 K, ε1(ω) = − A/ω2 for h̵ω < 200 cm−1 while σ(ω) decreases in the same spectral range, implying a narrow peak in σ(ω) at ħω well below 20 cm−1 with oscillator strength corresponding to about 2% of the total free-carrier oscillator strength
  • ‘Metallic’ PPy is, a conductor with a gap in the spectrum of charged excitations; the d.c. conductivity comes from a narrow peak in σ(ω) at or near ω = 0

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