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Static metal-semiconductor contacts are classified into Ohmic contacts andSchottky contacts. As for dynamic metal-semiconductor contacts, the in-depthmechanism remains to be studied. We here define a "triboelectric junction"model for analyzing dynamic metal-semiconductor contacts, where a space chargeregion induced by the triboelectric effect dominates the electron-holeseparation process. Through theoretical analysis and experiments, we concludethat the triboelectric junction affects the electric output in two aspects: 1)the junction direction determines the output polarity; 2) the junction strengthdetermines the output amplitude. The junction direction and junction strengthare both related to the electron-affinity difference between the contact metaland semiconductor. We find that the standard electrode potential inelectrochemistry best describes the electron affinity of a dynamicmetal-semiconductor contact.

Triboelectric Junction: A Model for Dynamic Metal-Semiconductor Contacts