Constructing Perovskite Organic Phototransistors Using a Triple Strategy to Achieve Visible and NIR Visual Synapses and Adaptive Functions

Abstract

Photoelectric synaptic transistors have the advantages of high bandwidth, high signal-to-noise ratio, low power consumption, and low crosstalk, which are crucial for the development of artificial visual perception systems. However, photoelectric synaptic transistors have problems such as low light sensitivity, narrow detection bandwidth, and poor adaptability to biological light. Here, a ternary strategy is employed to combine 2D perovskite with infrared polymeric material poly (n-alkylpyrrole dithiophene) (PDPP-DTT, abbreviated as PDPP) and small molecular material PC₆₁ BM to fabricated visible infrared wide spectrum phototransistor, which has both synaptic function and visual adaptative functions. The introduction of PDPP:PC₆₁ BM organic heterojunction promotes the separation and injection of photogenerated carriers in phototransistors, leading to high photosensitivity to visible and infrared light, achieving 4.9 × 10⁵ and 1.9 × 10⁵, respectively. Gate voltage, light intensity, and defects in perovskite organic heterojunctions can regulate the concentration of charge carriers in transistors, allowing the device array to mimic visual synapses and adaptive functions under red, green, blue and NIR light. The triple strategy for fabricating perovskite organic heterojunction transistors provides technical support for the development of high light sensitivity, wide bandwidth, and multifunctional artificial vision systems.