Ultrahigh-gain single SnO2 nanowire photodetectors made with ferromagnetic nickel electrodes

Abstract

We report the first attempt at magnetic manipulation of the photoresponse in a one-dimensional device in which a highly sensitive ultraviolet photodetector, composed of tin dioxide nanowire (SnO 2 NW) and ferromagnetic nickel (Ni) electrodes, has been fabricated and characterized. Surprisingly, as the Ni electrodes were magnetized, the photocurrent gain was greatly enhanced by up to 20 times, which is far beyond all of the previously reported enhancement factors for functionalized NW photodetectors. The underlying mechanism enabling the enhanced gain is attributed to both oxygen molecules adsorbed and surface band-bending effects due to the migration of electrons to the surface of SnO 2 NW caused by the magnetic field of ferromagnetic electrodes. The novel approach presented here can provide a new route for the creation of highly efficient optoelectronic devices based on the coupling between ferromagnetic materials and nanostructured semiconductors.

Electrical‐Polarization‐Induced Ultrahigh Responsivity Photodetectors Based on Graphene and Graphene Quantum Dots

“…[ 38 ] For simplicity in comparing the effect of substrate, η is assumed to be 1. [ 11 ] The calculated gain is plotted in Figure 3 f. It shows that the maximum photocurrent gain are ≈10 10 , 10 8 , and 10 5 for GQD/graphene/DPZT, GQD/graphene/SiO 2 , and GQD/graphene/UPZT, respectively.…”

CdS Nanoscale Photodetectors

“…It is generally accepted that nanostructures are ideal systems to satisfy these requirements because a small absorption region with a high surface area to volume ratio not only contributes to a short transport time and thus higher response speed but also allows for better structural compatibility with scaling down photodetectors. To date, a large variety of semiconductor nanostructures have been applied in photodetectors and some mechanisms involved have also been partly uncovered . For example, the research of metal oxide semiconductor nanostructures reveals that oxygen chemisorption plays a vital role in regulating the photosensitive properties.…”

Micro/Nano Gas Sensors: A New Strategy Towards In-Situ Wafer-Level Fabrication of High-Performance Gas Sensing Chips

“…In comparison with other strategies of the fabrication of MOS gas sensors with microhotplatforms and nano-sized SnO 2 as a sensitive material1516171831323335, our strategy is of lower cost, batch production, and more controllability. Not only the size, sensitive material, and doped catalysts can be well controlled, but the working temperature, sensitivity, and detection limit can be also controlled.…”

“…Due to these distinct advantages, much effort has geared towards the fabrication process of such nanostructured gas sensing materials. Many nanostructured materials such as nanoparticles45, nanotubes678910, nanowires111213141516171819, and hollow spheres202122 have been extensively researched for various gas sensing applications. In particular, nanostructured materials of metal oxide semiconductor (MOS), which possess remarkably high sensitivity and a large detection range to a variety of gases23, have been widely researched in recent decades and are expected to be deployed in domestic, industries, aerospace, and military applications6242526272829.…”