Enhancement of Photodetective Properties on Multilayered MoS2 Thin Film Transistors via Self-Assembled Poly-L-Lysine Treatment and Their Potential Application in Optical Sensors

Photodetectors and display backplane transistors based on molybdenum disulfide (MoS2) have been regarded as promising topics. However, most studies have focused on the improvement in the performances of the MoS2 photodetector itself or emerging applicati...

Full description

Bibliographic Details
Main Authors:	Seung Gi Seo, Jae Hyeon Ryu, Seung Yeob Kim, Jinheon Jeong, Sung Hun Jin
Format:	Article
Language:	English
Published:	MDPI AG 2021-06-01
Series:	Nanomaterials
Subjects:	a-Si:H TFT MoS<sub>2</sub> TFT photodetector comparative study molecular doping poly-L-lysine
Online Access:	https://www.mdpi.com/2079-4991/11/6/1586

id	doaj-c21fa63cb23b4fc682a3fa42f31fa6d3
record_format	Article
spelling	doaj-c21fa63cb23b4fc682a3fa42f31fa6d32021-07-01T00:23:25ZengMDPI AGNanomaterials2079-49912021-06-01111586158610.3390/nano11061586Enhancement of Photodetective Properties on Multilayered MoS<sub>2</sub> Thin Film Transistors via Self-Assembled Poly-L-Lysine Treatment and Their Potential Application in Optical SensorsSeung Gi Seo0Jae Hyeon Ryu1Seung Yeob Kim2Jinheon Jeong3Sung Hun Jin4Department of Electronic Engineering, Incheon National University, Incheon 22012, KoreaDepartment of Electronic Engineering, Incheon National University, Incheon 22012, KoreaDepartment of Electronic Engineering, Incheon National University, Incheon 22012, KoreaDepartment of Electronic Engineering, Incheon National University, Incheon 22012, KoreaDepartment of Electronic Engineering, Incheon National University, Incheon 22012, KoreaPhotodetectors and display backplane transistors based on molybdenum disulfide (MoS<sub>2</sub>) have been regarded as promising topics. However, most studies have focused on the improvement in the performances of the MoS<sub>2</sub> photodetector itself or emerging applications. In this study, to suggest a better insight into the photodetector performances of MoS<sub>2</sub> thin film transistors (TFTs), as photosensors for possible integrated system, we performed a comparative study on the photoresponse of MoS<sub>2</sub> and hydrogenated amorphous silicon (a-Si:H) TFTs. As a result, in the various wavelengths and optical power ranges, MoS<sub>2</sub> TFTs exhibit 2~4 orders larger photo responsivities and detectivities. The overall quantitative comparison of photoresponse in single device and inverters confirms a much better performance by the MoS<sub>2</sub> photodetectors. Furthermore, as a strategy to improve the field effect mobility and photoresponse of the MoS<sub>2</sub> TFTs, molecular doping via poly-L-lysine (PLL) treatment was applied to the MoS<sub>2</sub> TFTs. Transfer and output characteristics of the MoS<sub>2</sub> TFTs clearly show improved photocurrent generation under a wide range of illuminations (740~365 nm). These results provide useful insights for considering MoS<sub>2</sub> as a next-generation photodetector in flat panel displays and makes it more attractive due to the fact of its potential as a high-performance photodetector enabled by a novel doping technique.https://www.mdpi.com/2079-4991/11/6/1586a-Si:H TFTMoS<sub>2</sub> TFTphotodetectorcomparative studymolecular dopingpoly-L-lysine
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Seung Gi Seo Jae Hyeon Ryu Seung Yeob Kim Jinheon Jeong Sung Hun Jin
spellingShingle	Seung Gi Seo Jae Hyeon Ryu Seung Yeob Kim Jinheon Jeong Sung Hun Jin Enhancement of Photodetective Properties on Multilayered MoS<sub>2</sub> Thin Film Transistors via Self-Assembled Poly-L-Lysine Treatment and Their Potential Application in Optical Sensors Nanomaterials a-Si:H TFT MoS<sub>2</sub> TFT photodetector comparative study molecular doping poly-L-lysine
author_facet	Seung Gi Seo Jae Hyeon Ryu Seung Yeob Kim Jinheon Jeong Sung Hun Jin
author_sort	Seung Gi Seo
title	Enhancement of Photodetective Properties on Multilayered MoS<sub>2</sub> Thin Film Transistors via Self-Assembled Poly-L-Lysine Treatment and Their Potential Application in Optical Sensors
title_short	Enhancement of Photodetective Properties on Multilayered MoS<sub>2</sub> Thin Film Transistors via Self-Assembled Poly-L-Lysine Treatment and Their Potential Application in Optical Sensors
title_full	Enhancement of Photodetective Properties on Multilayered MoS<sub>2</sub> Thin Film Transistors via Self-Assembled Poly-L-Lysine Treatment and Their Potential Application in Optical Sensors
title_fullStr	Enhancement of Photodetective Properties on Multilayered MoS<sub>2</sub> Thin Film Transistors via Self-Assembled Poly-L-Lysine Treatment and Their Potential Application in Optical Sensors
title_full_unstemmed	Enhancement of Photodetective Properties on Multilayered MoS<sub>2</sub> Thin Film Transistors via Self-Assembled Poly-L-Lysine Treatment and Their Potential Application in Optical Sensors
title_sort	enhancement of photodetective properties on multilayered mos<sub>2</sub> thin film transistors via self-assembled poly-l-lysine treatment and their potential application in optical sensors
publisher	MDPI AG
series	Nanomaterials
issn	2079-4991
publishDate	2021-06-01
description	Photodetectors and display backplane transistors based on molybdenum disulfide (MoS<sub>2</sub>) have been regarded as promising topics. However, most studies have focused on the improvement in the performances of the MoS<sub>2</sub> photodetector itself or emerging applications. In this study, to suggest a better insight into the photodetector performances of MoS<sub>2</sub> thin film transistors (TFTs), as photosensors for possible integrated system, we performed a comparative study on the photoresponse of MoS<sub>2</sub> and hydrogenated amorphous silicon (a-Si:H) TFTs. As a result, in the various wavelengths and optical power ranges, MoS<sub>2</sub> TFTs exhibit 2~4 orders larger photo responsivities and detectivities. The overall quantitative comparison of photoresponse in single device and inverters confirms a much better performance by the MoS<sub>2</sub> photodetectors. Furthermore, as a strategy to improve the field effect mobility and photoresponse of the MoS<sub>2</sub> TFTs, molecular doping via poly-L-lysine (PLL) treatment was applied to the MoS<sub>2</sub> TFTs. Transfer and output characteristics of the MoS<sub>2</sub> TFTs clearly show improved photocurrent generation under a wide range of illuminations (740~365 nm). These results provide useful insights for considering MoS<sub>2</sub> as a next-generation photodetector in flat panel displays and makes it more attractive due to the fact of its potential as a high-performance photodetector enabled by a novel doping technique.
topic	a-Si:H TFT MoS<sub>2</sub> TFT photodetector comparative study molecular doping poly-L-lysine
url	https://www.mdpi.com/2079-4991/11/6/1586
work_keys_str_mv	AT seunggiseo enhancementofphotodetectivepropertiesonmultilayeredmossub2subthinfilmtransistorsviaselfassembledpolyllysinetreatmentandtheirpotentialapplicationinopticalsensors AT jaehyeonryu enhancementofphotodetectivepropertiesonmultilayeredmossub2subthinfilmtransistorsviaselfassembledpolyllysinetreatmentandtheirpotentialapplicationinopticalsensors AT seungyeobkim enhancementofphotodetectivepropertiesonmultilayeredmossub2subthinfilmtransistorsviaselfassembledpolyllysinetreatmentandtheirpotentialapplicationinopticalsensors AT jinheonjeong enhancementofphotodetectivepropertiesonmultilayeredmossub2subthinfilmtransistorsviaselfassembledpolyllysinetreatmentandtheirpotentialapplicationinopticalsensors AT sunghunjin enhancementofphotodetectivepropertiesonmultilayeredmossub2subthinfilmtransistorsviaselfassembledpolyllysinetreatmentandtheirpotentialapplicationinopticalsensors
_version_	1721348780054282240

Enhancement of Photodetective Properties on Multilayered MoS<sub>2</sub> Thin Film Transistors via Self-Assembled Poly-L-Lysine Treatment and Their Potential Application in Optical Sensors

Similar Items