Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Layered semiconductors attract significant attention due to their diverse physical properties controlled by their composition and the number of stacked layers, but still obtaining material in large quantity may be a challenge. Liquid exfoliated van der Waals semiconducting crystals have been recently described as the main active material in all-printed devices such as transistors or photodetectors. This technique may lower device preparation cost by accelerating production and omitting expensive methods like lithography.
Herein, large crystals of the ternary layered semiconductor - chromium thiophosphate (CrPS4) are prepared in big amounts by a vapor transport synthesis. Optical properties are determined using photoconduction, absorption, photoreflectance, and photoacoustic spectroscopy exposing the semiconducting properties of the material. [1] A simple, versatile, one-step protocol for mechanical exfoliation onto transmission electron microscope grid is developed [1], [2] and multiple layers are characterized by advanced electron microscopy methods, including atomic resolution elemental mapping confirming the structure by directly showing the positions of the columns of different elements’ atoms. [1]
CrPS4 is also liquid exfoliated and then obtained suspension is converted into an ink. Finally, the CrPS4 ink in combination with colloidal graphene is used for creating ink-jet printed photodetector. This all-printed graphene/CrPS4/graphene heterostructure detector demonstrates specific detectivity of 8.3×108 (D*). The study shows a potential application of both bulk crystal as well as individual flakes of CrPS4 as active components in light detection, when introduced as ink printable moieties with a large benefit for manufacturing. [1]
This work was supported by the European Commission via the Marie-Sklodowska Curie action Phonsi (H2020-MSCA-ITN-642656)
S.J.Z. and R.K. performed research within the grant of the National Science Centre Poland (OPUS 11 No. 2016/21/B/ST3/00482).
S.J.Z. also acknowledges the support within the ETIUDA 5 grant from National Science Center Poland (no. 2017/24/T/ST3/00257).
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