Simultaneously Harvesting Friction and Solar Energy via Organic/Silicon Heterojunction with High Direct-Current Generation

摘要

The direct-current triboelectric nanogenerator (TENG) is a promising portable energy source that can power mobile electronics without any rectification circuits. Recently, the silicon-based TENGs, as a rectification-free power source, have drawn wide attention due to their high current-density outputs. However, the performance of silicon-based TENGs is still inferior owing to a low amount of carrier generation and poor efficiency of carrier collection. Here, a strategy is proposed to improve the performance of metal/silicon TENGs via building an alternative device structure consisting of a transparent conductive polymer interlayer. This transparent interlayer can passivate surface defects as well as enhance carrier extraction, enabling a simultaneous harvest of friction and solar energy. More importantly, the gain effect of friction-induced electric field occurs, which significantly surges the power output efficiency. As a result, the device yields a record output performance with an output voltage over 1000 mV and an output current up to 6.0 x 10(3) A m(-2) under 20 mW cm(-2) white light illumination. This research not only promises an alternative energy source device that can harvest both mechanical and solar energy but also paves the way to separate photo-generated carriers with a friction-induced electric field.