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2D van der Waals Heterojunction of Organic and Inorganic Monolayers for High Responsivity Phototransistors
Author(s) -
Zhao Baolin,
Gan Ziyang,
Johnson Manuel,
Najafidehaghani Emad,
Rejek Tobias,
George Antony,
Fink Rainer H.,
Turchanin Andrey,
Halik Marcus
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202105444
Subject(s) - monolayer , materials science , heterojunction , van der waals force , photocurrent , raman spectroscopy , photoluminescence , optoelectronics , nanotechnology , molecule , optics , chemistry , organic chemistry , physics
Van der Waals (vdW) heterostructures composing of organic molecules with inorganic 2D crystals open the door to fabricate various promising hybrid devices. Here, a fully ordered organic self‐assembled monolayer (SAM) to construct hybrid organic–inorganic vdW heterojunction phototransistors for highly sensitive light detection is used. The heterojunctions, formed by layering MoS 2 monolayer crystals onto organic [12‐(benzo[b]benzo[4,5]thieno[2,3‐d]thiophen‐2‐yl)dodecyl)]phosphonic acid SAM, are characterized by Raman and photoluminescence spectroscopy as well as Kelvin probe force microscopy. Remarkably, this vdW heterojunction transistor exhibits a superior photoresponsivity of 475 A W −1 and enhanced external quantum efficiency of 1.45 × 10 5 %, as well as an extremely low dark photocurrent in the pA range. This work demonstrates that hybridizing SAM with 2D materials can be a promising strategy for fabricating diversified optoelectronic devices with unique properties.