Graphene-black phosphorus printed photodetectors

S Akhavan, A Ruocco, G Soavi, AT Najafabadi… - 2D …, 2023 - iopscience.iop.org
2D Materials, 2023iopscience.iop.org
Layered materials (LMs) produced by liquid phase exfoliation (LPE) can be used as building
blocks for optoelectronic applications. However, when compared with mechanically
exfoliated flakes, or films prepared by chemical vapor deposition (CVD), LPE-based printed
optoelectronic devices are limited by mobility, defects and trap states. Here, we present a
scalable fabrication technique combining CVD with LPE LMs to overcome such limitations.
We use black phosphorus inks, inkjet-printed on graphene on Si/SiO 2, patterned by inkjet …
Abstract
Layered materials (LMs) produced by liquid phase exfoliation (LPE) can be used as building blocks for optoelectronic applications. However, when compared with mechanically exfoliated flakes, or films prepared by chemical vapor deposition (CVD), LPE-based printed optoelectronic devices are limited by mobility, defects and trap states. Here, we present a scalable fabrication technique combining CVD with LPE LMs to overcome such limitations. We use black phosphorus inks, inkjet-printed on graphene on Si/SiO 2, patterned by inkjet printing based lithography, and source and drain electrodes printed with an Ag ink, to prepare photodetectors (PDs). These have an external responsivity (R ext)∼ 337 A W− 1 at 488 nm, and operate from visible (∼ 488 nm) to short-wave infrared (∼ 2.7 µm, R
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