ANALYSIS OF CHARGE CARRIERS IN BIOELECTRETS
生物驻极体载流子特性分析

In this paper, the properties of charge carriers in pig bone, a kind of bioelectrets, is analyzed.The results showed that conduction carriers in animal bones came mainly from water molecules bound in gelatin fibers and basal cells in general. The Hall coefficient measured by Van der Pauws method showed to be negative for virgin samples, which have some characteristics of a N- type semiconductor. If the measurement was carried out after the sample was dried under high temperature. the inverse transition of Hall coefficient was observed and the sample showed the conductive property of a P - type semiconductor. The transition is cxpalined as that the lose of water molecules makes the positive ions govern the conductive process. The thermally stimulated depolarizaion current (TSDC) spectrum of short circuit of sample was found to have a negative peak during the transport of water molecules. It was found that the exated energy of a negative charge in pig bone was around 0.86eV.