Electrospinning-derived piezoelectric polymer P(VDF-TrFE) fibers represent promising materials for piezoelectric self-powered sensors in wearable and biomedical applications, attributed to their lightweight nature, flexibility, and superior piezoelectric properties. However, integrating effective electrodes with P(VDF-TrFE) fibers remains challenging. Metal electrodes often fail to maintain stable contact on complex fiber surfaces, while conductive polymer electrodes face limitations in conductivity and chemical compatibility with P(VDF-TrFE). To address these issues, a composition-gradient interface is developed between organic conducting polymer, PEDOT:PSS electrodes, and P(VDF-TrFE) fibers, resulting in high-efficiency, all-organic piezoelectric self-powered sensors. This interface, achieved through carefully selecting DMSO as a doping solvent, creates a mechanically robust structure that enhances compatibility between PEDOT:PSS and P(VDF-TrFE). The optimized gradient electrode exhibits a sheet resistance of 3.5 Ω sq