Significantly Increased Photoresponsivity of WSe 2 -Based Transistors through Hybridization with Gold-Tetraphenylporphyrin as Efficient n-Type Dopant

Dong Seop Lee, Jun Young Kim, Dae Yong Shin, Yongjun Lee, Jeongyong Kim, Suk Joong Lee, Jinsoo Joo

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The control of electrical and optical characteristics of 2D transition-metal dichalcogenides (TMDCs) through charge doping is essential to optimize the performances of optoelectronic devices based on TMDCs. In this study, a few-layer tungsten diselenide (WSe 2 ) is hybridized with organic gold(III)-tetraphenylporphyrin (Au-TPP) using a simple drop-casting method. Nanoscale optical characteristics, measured by laser confocal microscopy, reveal that the photoluminescence intensity and exciton lifetime of Au-TPP decrease after the hybridization with WSe 2 , which suggests the charge transfer from Au-TPP to WSe 2 . For optoelectronic applications, photoresponsive field-effect transistors (FETs) based on pristine WSe 2 and WSe 2 /Au-TPP hybrids are fabricated and compared. After the hybridization with Au-TPP, the charge transport characteristics of the WSe 2 -based FETs change to severe n-type characteristics including a negative shift of the threshold voltage and increase in electron mobility. Significantly enhanced photoresponsivities (up to 310 times) are observed for the WSe 2 /Au-TPP-based FETs owing to their efficient light absorption and charge transfer from Au-TPP to WSe 2 .

Original languageEnglish
Article number1800802
JournalAdvanced Electronic Materials
Volume5
Issue number4
DOIs
Publication statusPublished - 2019 Apr

Bibliographical note

Funding Information:
This study was supported by National Research Foundation (NRF) of Korea funded by the Korean government (No. NRF-2018R1A2B2006369) and LG Display under LGD-Korea University Incubation Program.

Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • WSe
  • mobility
  • photoresponsivity
  • porphyrin derivatives
  • transistors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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