Electrical & Electronic Materials (E2M - 전기 전자와 첨단 소재)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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$\pi$-A Isotherms and Electrical Properties of Polyamic acid Alkylamine salts(PAAS) Langmuir-Blodgett Films

  • Kim, Tae-Wan (Department of Physics, Hong Ik University) ;
  • Park, Jun-Su (Department of Electrical and Control Engineering, Hong Ik University) ;
  • Cho, Jong-Sun (Department of Electrical and Control Engineering, Hong Ik University) ;
  • Kang, Dou-Yol (Department of Electrical and Control Engineering, Hong Ik University)
  • Published : 1998.10.01
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Abstract

Deposition conditions, surface morphology, and electrical properties of polyamic acid alkylamine salts (PAAS) Langmuir-Blodgett(LB) films have been investigated through a study of surface pressure-area $\pi$-A isotherms, AFM (atomic force microscopy), and current-voltage characteristics. To obtain the optimum conditions of film deposition, the $\pi$-A isotherms were examined by varying temperature, barrier moving speed, dipping speed, spreading amount of solution etc. The Z-type LB films were made at the surface pressure of 5 mN m-1 and 25 mN m-1 for the AFM study; the former surface pressure forms the gas phase and the latter one forms the solid phase. The LB film made in the gas phase show domains with a size of about 200 A diameter and 70 A height. However, the LB films made in the solid phase show a very smooth surface with 2 A surface roughness. In the current-voltage characteristics measured along the perpendicular direction of the films, ohmic conduction has been observed below 105 V cm-1 and the calculated electrical conductivity is about 10-13 S cm-1. Nonohmic conduction has been observed above = 10-11 V cm and the conduction mechanism can be explained by the Schottky effect.

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