Self-powered broadband photodetector based on MoS₂/Sb₂Te₃ heterojunctions: a promising approach for highly sensitive detection

Abstract

Topological insulators have shown great potential for future optoelectronic technology due to their extraordinary optical and electrical properties. Photodetectors, as one of the most widely used optoelectronic devices, are crucial for sensing, imaging, communication, and optical computing systems to convert optical signals to electrical signals. Here we experimentally show a novel combination of topological insulators (TIs) and transition metal chalcogenides (TMDs) based self-powered photodetectors with ultra-low dark current and high sensitivity. The photodetector formed by a MoS2/Sb2Te3 heterogeneous junction exhibits a low dark current of 2.4 pA at zero bias and 1.2 nA at 1V. It shows a high photoresponsivity of >150 mA W−1 at zero bias and rectification of 3 times at an externally applied bias voltage of 1V. The excellent performance of the proposed photodetector with its innovative material combination of TMDs and TIs paves the way for the development of novel high-performance optoelectronic devices. The TIs/TMDs transfer used to form the heterojunction is simple to incorporate into on-chip waveguide systems, enabling future applications on highly integrated photonic circuits.

Broadband and self-driven photodetector based on MoS2/Sb2Te3 heterojunction

“…[112]Meanwhile, TIs with topologically protected gapless conductive edge states or surface states have extremely high mobility and a broad detection range when compared to graphene, which has no band gaps. [56], [113] Their distinct semiconducting properties are also useful to combine with other semiconductors to be heterojunctions [81].…”

Free-space optical multiplexed orbital angular momentum beam identification system using Fourier optical convolutional layer based on 4f system

“…Free-space optical communication (FSOC) uses optical wavelength (from ultraviolet to infrared) to achieve data transmission through the atmosphere without the requirement of a physical communication link. [1][2][3][4][5][6][7][8][9][10][11] By leveraging the advantage of wider spectrum range in optical bands and compact spatial confinement from a laser beam, FSOC has already provided the ability to cater for high-capacity optical data transmission demand such as using wavelength division multiplexing (WDM) in the Tb/s regime. 12 Meanwhile, confined beam divergence guarantees the security of the communication link to a higher level since a third-party detector could intercept the transmitting beam only when it is placed close to the FSOC path.…”

“…[52][53][54][55][56][57] Learning-based Imaging and focusing through scattering medium, computer-generated holography based on machine learning have been studied. [58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75] In FSOC, Timothy Doster and Abbie T. Watnik firstly introduced new method to detect the active OAM modes in a transmission link by utilizing convolutional neural network (CNN) [1]. Qinghua Tian et al proposed a novel turbo-coded 16-ary orbital angular momentum-shift keying -free space optical (OAM-SK-FSO) communication system combining a CNN based adaptive demodulator under strong AT for the first time.…”

Reconfigurable focusing and defocusing meta lens using Sb2Se3 phase change material

“…Compare to other proposed on-chip integrated photonic hardware accelerator, in memory computational photonic tensor core 23,27,31,[34][35][36][37][38][39][40][41][42][43][44] , all optical convolution solution provides alternative solution with higher data processing rate and lower power consumption 45,46 . With the combine implementation of high performance electrooptic modulators [47][48][49][50][51][52][53][54][55][56] , photodetectors [57][58][59] , signal converters 60 and the reconfigurable metalens, a fully integrated all optical neuromorphic architecture could be realized soon. In this work, as proof as the concept, a reconfigurable lens based on a low loss phase change material Sb2Se3 61,62 optical properties transformation (∆n) between amorphous and crystalline states which are introduced by the ITO based novel low loss transparent heater is proposed and demonstrated.…”