The word piezo means stress/pressure in Greek. This is a special property exhibited by only non-centrosymmetric materials. In piezoelectric effect, these materials generate an electric field or current when subjected to physical stress. This phenomenon is connected to the material's nanostructures.
Greek terms "Tribo" (which means "rub" or "friction") and "electric" (which comes from "amber") are combined to get the word "triboelectric." The triboelectric nanogenerators works based on the triboelectric effect (contact electrification and electrostatic induction), which can convert mechanical energy into electricity. This phenomenon characterized by the generation and transfer of the charges between two materials, when it comes to physical contact.
Basic Device Design of PENG
Basic Device Design of TENG