Organic Ultraviolet-Selective C8-BTBT Transistors Inspired by Avian Vision.

Inspired by avian vision, we present an organic ultraviolet-selective phototransistor. The lithium-ion solid-state electrolyte lithium lanthanum zirconium oxide (LLZO), which has high stability at room temperature, is applied as the dielectric layer of a transistor device. The device achieved an operating voltage below 4 V and a current on/off ratio reaching 2.04 × 109, with the subthreshold swing in the linear region as low as 61.39 mV dec-1. Because of the selective absorption of the active layer in the ultraviolet region, a pronounced photoresponse under ultraviolet illumination is observed. The mobile Li+ ions in the LLZO dielectric layer can attract electrons near the interface, dynamically modulating photogenerated carrier transport. Based on the organic ultraviolet-selective transistor array, the perceptual differences between human and avian vision under visible and ultraviolet light are simulated, offering a conceptual pathway for advancing artificial vision systems.