Regensburg 2002 – wissenschaftliches Programm
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SYOH: Organische Halbleiter
SYOH 7: Poster
SYOH 7.26: Poster
Montag, 11. März 2002, 18:00–21:00, C
Photostimulated Discharge Spectroscopy of Charge-Storing Polymers — •Francisco Camacho González1, Axel Mellinger1, Lucas Fugikawa Santos2, Roberto M. Faria2, and Reimund Gerhard-Multhaupt1 — 1Institut für Physik, Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany — 2Instituto de Física de São Carlos, Universidade de São Paulo, CEP 13560-970 São Carlos (SP), Brazil
Charge-storing electret polymers, such as polytetrafluoroethylene (PTFE), have long been used in commercial applications. However, the microscopic processes of charge storage are not yet well understood. To investigate trap depths and possible detrapping mechanisms, photostimulated discharge experiments of electron-beam and corona charged PTFE and polyethyleneterephthalate (PETP) films were performed. For PTFE, the spectra show the onset of a strong photocurrent (up to several 100 pA) at wavelengths below 270 nm. Charge-density profiles recorded with the piezoelectrically generated pressure step (PPS) method show that photo-bleaching at 230 nm results in a quantitative depopulation of near-surface charges, whereas only partial detrapping could be achieved for bulk charges.