Magnetically controllable and flexible phototransistor for artificial intelligent skin with additional perception

Abstract

With rational design, emerging artificial intelligent systems enable to possess capabilities far beyond human beings. Here, we report a novel magnetically controllable and flexible phototransistor using a tandem structure composed of an organic solar cell (OSC) of ITO/ZnO/P3HT:PC61BM/MoO3/Ag and a magnetic micropyramid array film of FeNi/PDMS composite covered with silver nanowires (AgNWs) (FeNi/PDMS/AgNWs) separated by an air gap. The FeNi/PDMS/AgNWs micropyramid structure takes the advantage of the Ag electrode of the bottom OSC forming a magnetoelectronic device. This novel seamless integrated device can interact with external stimuli, including pressure, light and magnetic field, forming an intriguing type of transistor. The output current of the developed transistor can be modulated by both optical excitation and magnetic field simultaneously, making it possess new functionalities. Additionally, the phototransistor carries several outstanding features, including fast photo/magnetic-response time, non-contact magnetic/optical control, and mechanical flexibility. These promising properties diversify the applications of the proposed phototransistor for the implementation in wearable electronics, touchless technology, and optical communication.