Supersensitive, Fast‐Response Nanowire Sensors by Using Schottky Contacts

Abstract

A Schottky barrier can be formed at the interface between a metal electrode and a semiconductor. The current passing through the metal-semiconductor contact is mainly controlled by the barrier height and barrier width. In conventional nanodevices, Schottky contacts are usually avoided in order to enhance the contribution made by the nanowires or nanotubes to the detected signal. We present a key idea of using the Schottky contact to achieve supersensitive and fast response nanowire-based nanosensors. We have illustrated this idea on several platforms: UV sensors, biosensors, and gas sensors. The gigantic enhancement in sensitivity of up to 5 orders of magnitude shows that an effective usage of the Schottky contact can be very beneficial to the sensitivity of nanosensors.

Piezoresistivity Characterization of Synthetic Silicon Nanowires Using a MEMS Device

“…Nanomaterials can be fabricated directly on MEMS devices [9], [30]. Presynthesized nanomaterials were also transferred onto MEMS devices via dielectrophoresis trapping [12], [22], [31], focused-ion-beam deposition [14], and direct pick and place [11], [13], [17], [20], [32]- [35]. Due to the flexibility of pick-and-place nanomanipulation inside SEM and no need for nanomaterial preprocessing (e.g., sonication), we transferred individual silicon nanowires from growth substrates onto MEMS devices via direct pick and place.…”

One-Dimensional Zinc Oxide Nanomaterials for Application in High-Performance Advanced Optoelectronic Devices

“…To realize ZnO-based UV photodetectors with high sensitivity and fast response time, a Schottky contact instead of an ohmic contact was adopted [107,[112][113][114][115]. For example, Zhou and coworkers fabricated a Schottky junction-type photodetector that used ZnO nanowire and Pt metal electrode to form Schottky contact [98].…”

Role of Contact and Contact Modification on Photo-response in a Charge Transfer Complex Single Nanowire Device

“…In earlier work, different materials have been used as photoconductive device e.g. MoS 2 [1], Si [3], ZnO [9], Bi 2 S 3 [10], InP [11], CdS [12] etc. It is reported that these material can give substantial photoconductive gain using Schottky contact where they have been used as single nanowire device.…”

“…Nanotubes, nanowires and nanobelts are important one-dimensional (1D) nanomaterials that are the foundation for nanoscience and nanotechnology [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Novel nanoscale optoelectronic devices are important applications of nanomaterials, particularly nanowires which can be scaled down to a single nanowire (NW) device [1][2][3][4][5][6][7][8][9][10][11][12].…”

“…Novel nanoscale optoelectronic devices are important applications of nanomaterials, particularly nanowires which can be scaled down to a single nanowire (NW) device [1][2][3][4][5][6][7][8][9][10][11][12]. Contact electrodes play an important role in improving performance of nanoscale devices [1][2].…”