Regensburg 2019 – wissenschaftliches Programm

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SYCO: Symposium Mechanically Controlled Electrical Conductivity of Oxides

SYCO 1: Mechanically controlled electrical conductivity of oxides

SYCO 1.4: Hauptvortrag

Montag, 1. April 2019, 11:30–12:00, H1

Mapping strain/pressure with ZnO nanowire arrays by piezo-phototronic effect — •Caofeng Pan — Beijing Institute of Nanoenergy and Nanosystems,Chinese Academy of Science

Emulation of human senses via electronic means has long been a grand challenge in research of artificial intelligence as well as prosthetics, and is of pivotal importance for developing intelligently accessible and natural interfaces between human/environment and machine. In this talk, we present a novel design of ZnO nanowire arrays, which can be used to directly record the strain distribution by piezotronic and piezo-phototronic effect. First, we demonstrated how the piezo-phototronic effect can be effectively utilized to enhance the emission intensity of an n-ZnO/p-GaN NW LED. The emission light intensity and injection current at a fixed applied voltage has been enhanced by a factor of 17 and 4 after applying a 0.093% compressive strain, respectively. Then, we extend the single NW device to NW LEDs array, for pressure/force sensor arrays for mapping strain with a resolution as high as 2.7 µm. Such sensors are capable of recording spatial profiles of pressure distribution, and the tactile pixel area density of our device array is 6250000/cm², which is much higher than the number of tactile sensors in recent reports ( 6-27/cm²) and mechanoreceptors embedded in the human fingertip skins (  240/cm²). This research may be a great step toward digital imaging of mechanical signals using optical means, having potential applications in artificial skin, touch pad technology, personalized signatures, bio-imaging and optical MEMS, and even and smart skin.