fig4

Figure 4. (A-G) Cyclic voltage output performances of CPB/PVDF nanocomposite fiber films with increasing CPB loadings from 0 to 6 wt.% under various applied forces of 10, 15, 20 and 25 N, respectively, measured at 2 Hz. (H) Comparison on variation of maximum output voltage (peak-to-peak) with CPB loadings under fixed force. (I) Normalized maximum output voltage with respect to film thicknesses measured at 10 N, 2 Hz. (J) Simultaneously collected V_oc and short-circuit current signals upon finger tapping the 4 wt.% CPB/PVDF device repeatedly. CPB: CsPbBr₃; PVDF: poly(vinylidene fluoride).