High‐performance optical noncontact controlling system based on broadband PtTe_x/Si heterojunction photodetectors for human–machine interaction

Abstract

Noncontact interaction systems have attracted considerable research attention in recent years because of convenient operation, sterility, and injury prevention. However, the insufficient sensing distance and weak robustness of noncontact interaction systems for complex environments limit their practical applications. Here, we designed an integrated optical noncontact controlling system (ONCS) based on PtTex/Si optoelectronic heterojunction array. Broadband sensitive photoresponse is realized at zero bias voltage, with excellent detectivity and responsivity, boosting the noncontact sensing distance to at least 150 mm. Consequently, the system can perform noncontact detection, encoding, and control by recognizing shadow‐induced spatiotemporal sequence changes in heterojunction array photocurrents. As a proof of concept, different interactive functions have been demonstrated with good accuracy and robustness by encoding finger movement above the ONCS. This study provides a new perspective for constructing high‐performance noncontact interaction systems.

Nanopatterning Technologies of 2D Materials for Integrated Electronic and Optoelectronic Devices

“…[164] For optoelectronic devices, the demand of miniaturization of optoelectronics devices has emerged which requires the high integration density of devices. However, with [180] Copyright 2021, The Authors, published by UESTC and John Wiley & Sons Australia, Ltd. c) Schematic of the MoS 2 optoelectronic processor inspired by the biological vision. d) Lithographically fabricated large-area MoS 2 FET crossbar arrays.…”

“…This work potentially promotes the arrayed 2D materials into particle use, and demonstrates a possible way to integrate 2D/3D optoelectronic architectures. [ 180 ]…”

“…a,b) Reproduced under the terms of the CC‐BY Creative Commons Attribution 4.0 International license ( https://creativecommons.org/licenses/by/4.0). [ 180 ] Copyright 2021, The Authors, published by UESTC and John Wiley & Sons Australia, Ltd. c) Schematic of the MoS 2 optoelectronic processor inspired by the biological vision. d) Lithographically fabricated large‐area MoS 2 FET crossbar arrays.…”

“…[54,172,179] Very recently, Li et al reported an optical noncontact controlling system (ONCS) based on PtTe x /Si photodetector arrays. [180] The photodetector arrays are fabricated through lithography-assisted in situ transformation. The platinum was deposited on silicon substrates by magnetron sputtering and then transformed into PtTe x under tellurium-vapor.…”

“…This work potentially promotes the arrayed 2D materials into particle use, and demonstrates a possible way to integrate 2D/3D optoelectronic architectures. [180] Moving forward from the single imaging function of traditional photodetector, Ham et al developed an analog optoelectronic processor inspired by biological vision, which is composed of a crossbar array of 32 × 32 MoS 2 photo-FETs (Figure 9c,d) and exhibits persistent photoconductivity effects. [181] The FET array is fabricated through the top-down methods.…”