Dynamic Perovskite Homojunction Based Light-Assisted, Direct Current Tribovoltaic Nanogenerators

Tribovoltaic nanogenerators (TVNG) are an emerging energy technology featuring high direct current density and continuous power output. Recently, a new kind of perovskite/metal Schottky-based TVNG has attracted increasing attention, which can co-harvest mechanical and solar energy to dramatically improve the DC output performance. However, the instability of the perovskite-metal interface and unnecessary carrier recombination loss limit its practicability. Here, a novel light-assisted TVNG based on a dynamic N-type perovskite/P-type perovskite homojunction is developed. The homojunction design can ensure stable interface contact, and contributes to forming a strong built-in electric field to promote efficient carrier separation/extraction and decrease interfacial charge recombination loss. In addition, the innovative design of the dual perovskite functional electrode maximizes its photovoltaic characteristics and further facilitates the excitation of more charges based on tribo-photovoltaic coupling effects. Eventually, the output voltage and current of dynamic perovskite homojunction can boost up to ≈8.72 V and ≈30.84 µA under illumination, showing outstanding performance among the state-of-the-art perovskite-based TVNGs. These findings demonstrate the great potential of perovskite materials in generating DC power and present a feasible strategy to construct efficient, multifunctional TVNGs.