Polymer electrochemical cells have been reported to emit light. The current and light output increase rapidly with voltage, apparently beyond 2 V. The polymer is an ionic conductor as well as an electronic (electron/hole) conductor, i.e. a mixed ionic-electronic conductor (MIEC). The I-V relations are explained here to be those of an MIEC of a particular defect model placed between two ion blocking electrodes. This MIEC defect model assumes a large concentration of mobile ions and small concentrations of electrons and holes. A p and an n region are formed in the MIEC. However, there is no space charge within the MIEC and it stays neutral. The resulting I-V relations are exponential. A good fit to the experimental data is obtained when electrode over-potential and heating of the polymer under current are taken into consideration.
|Number of pages||8|
|Journal||Materials Research Society Symposium - Proceedings|
|State||Published - 1999|
|Event||Proceedings of the 1998 MRS Fall Meeting - Symposium 'Solid State Ionics V' - Boston, MA, USA|
Duration: 28 Nov 1998 → 3 Dec 1998