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Fast-Response Micro-Phototransistor Based on MoS2/Organic Molecule Heterojunction

Over the past years, molybdenum disulfide (MoS2) has been the most extensively studied two-dimensional (2D) semiconductormaterial. With unique electrical and optical properties, 2DMoS2 is considered to be a promising candidate for future nanoscale electronic and optoelectronic devices. However, char...

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Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2023-04, Vol.13 (9), p.1491
Main Authors: Andleeb, Shaista, Wang, Xiaoyu, Dong, Haiyun, Valligatla, Sreeramulu, Saggau, Christian Niclaas, Ma, Libo, Schmidt, Oliver G., Zhu, Feng
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cited_by cdi_FETCH-LOGICAL-c456t-ad8a67cdac29aa4df9cdd24bbd76576a4517a71be01a77f1dea4697190760e203
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container_issue 9
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container_title Nanomaterials (Basel, Switzerland)
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creator Andleeb, Shaista
Wang, Xiaoyu
Dong, Haiyun
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Ma, Libo
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description Over the past years, molybdenum disulfide (MoS2) has been the most extensively studied two-dimensional (2D) semiconductormaterial. With unique electrical and optical properties, 2DMoS2 is considered to be a promising candidate for future nanoscale electronic and optoelectronic devices. However, charge trapping leads to a persistent photoconductance (PPC), hindering its use for optoelectronic applications. To overcome these drawbacks and improve the optoelectronic performance, organic semiconductors (OSCs) are selected to passivate surface defects, tune the optical characteristics, and modify the doping polarity of 2D MoS2. Here, we demonstrate a fast photoresponse in multilayer (ML) MoS2 by addressing a heterojunction interface with vanadylphthalocyanine (VOPc) molecules. The MoS2/VOPc van der Waals interaction that has been established encourages the PPC effect in MoS2 by rapidly segregating photo-generated holes, which move away from the traps of MoS2 toward the VOPc molecules. The MoS2/VOPc phototransistor exhibits a fast photo response of less than 15 ms for decay and rise, which is enhanced by 3ordersof magnitude in comparison to that of a pristine MoS2-based phototransistor (seconds to tens of seconds). This work offers a means to realize high-performance transition metal dichalcogenide (TMD)-based photodetection with a fast response speed.
doi_str_mv 10.3390/nano13091491
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subjects Electric fields
Energy
Heterojunctions
heterostructure
Interfaces
Lasers
Molybdenum
Molybdenum disulfide
Morphology
MoS2
Multilayers
Optical properties
Optoelectronic devices
Organic chemistry
organic molecule
Organic semiconductors
Photoresponse
phototransistor
Spectrum analysis
Surface defects
Transition metal compounds
transition metal dichalcogenides
VOPc
title Fast-Response Micro-Phototransistor Based on MoS2/Organic Molecule Heterojunction
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