Author/Authors :
Romberg، نويسنده , , H.A. and Nücker، نويسنده , , N. and Fink، نويسنده , , J. and Unterweger، نويسنده , , O.F. and Stampfl، نويسنده , , J. and Leising، نويسنده , , G.، نويسنده ,
Abstract :
The electronic structure of a ladder polymer of PPP has been investigated by high-energy electron energy-loss spectroscopy (EELS) in transmission. The band gap of the undoped compound is about 0.4 eV smaller compared to PPP. Information on the character of the undoped LPPP as well as on bipolaron states formed upon K doping in the former band gap are obtained from momentum dependent EELS investigations. The extension of the bipolaron is estimated to 20 ±4 إ.
