Nanoscale insights into triboelectric charge behavior of perovskite films for high-performance energy harvesting

The outstanding performance of halide perovskites demonstrates significant potential for the fabrication of simple, efficient, and high-performance Triboelectric nanogenerators (TENGs). In this work, two distinct perovskite films were successfully prepared by precise compositional control and integrated with Poly (vinylidene fluoride)/Polyethylene terephthalate (PVDF/PET) to construct perovskite-based TENG devices. Experimental results reveal that the perovskite film exhibits reduced defects and extended carrier lifetime, which facilitate charge retention and interfacial triboelectric charge transfer. Following compositional control, the output voltage ( V oc ) and current ( I sc ) of the perovskite device increased by 32.1 V and 1.5 μA. Scanning Kelvin probe microscopy shows that perovskite B (Cs 0.05 FA 0.85 MA 0.10 Pb(I 0.97 Br 0.03 ) 3 , PB) exhibits a greater surface potential increase compared to perovskite A (Cs 0.05 (FA 0.85 MA 0.15 ) 0.95 PbI 0.85 Br 0.15 , PA) after contact with PVDF. Notably, PB shows an increased surface potential after contact with PVDF, whereas its surface potential decreases after contact with PET. Complementary electrostatic force microscopy measurements further support that PB's surface becomes positively charged upon PVDF contact and negatively charged after PET contact. This study provides new insight into the triboelectric mechanisms of perovskite materials.