HIGH-TEMPERATURE BEHAVIOR OF THERMOELECTRIC-POWER OF IMPLANTED POLYMER-FILMS

The results of thermopower S measurements performed on implanted polyp araphenylene and polyimide films between 150 K and 450 K are presented . The implantations of Caesium or Iodine ions in polyparaphenylene wit h low parameters induce a sign of S characteristic to chemical nature of the implanted ions and an increase of \S\ at around 350 K due to a transition from a VRH process to a polaronic conduction. With Iodine i mplanted sample at higher energy (E = 250 keV) and low dose (D = 2 x 1 0(15) ions/cm(2)) a transition from p type to n type doping at 400 K i s attributed to a migration of negative oxygen ions as in the case of polyimide samples implanted with Caesium and Iodine ions where a simil ar behaviour of S is found.