Issue 38, 2024

Poly(vinyl alcohol)-assisted synthesis of 3D Bi2S3 submicrometric structures for feasible chip photodetector applications

Abstract

Bismuth sulfide (Bi2S3) is a chalcogenide semiconductor with a relatively narrow energy band gap that is promising for use in solar cells and photodetectors. This paper presents a highly efficient microwave synthesis of Bi2S3 submicrometric structures using poly(vinyl alcohol) (PVA) as a viscosity modification agent. The chemical composition, morphology, crystal structure, and optical properties of the prepared materials were investigated using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, and diffuse reflectance spectroscopy (DRS). The use of PVA in Bi2S3 synthesis resulted in a change in material morphology from microrods to nanosheets and a slight increase in the energy band gap from 1.34 eV to 1.43 eV. The Bi2S3 nanosheets were examined as photosensitive materials for the detection of visible light. High ON/OFF ratios of 66, 44, and 15 and large specific detectivities of 1.12 × 1011, 7.68 × 1010, and 6.43 × 1010 Jones were achieved under blue (468 nm, 0.52 μW cm−2), green (517 nm, 0.95 μW cm−2), and red (628 nm, 0.13 μW cm−2) light illuminations, respectively. The photosensitive properties of Bi2S3 nanosheets were remarkable compared to that of many other photodetectors based on Bi2S3 micro- and nanostructures.

Graphical abstract: Poly(vinyl alcohol)-assisted synthesis of 3D Bi2S3 submicrometric structures for feasible chip photodetector applications

Supplementary files

Article information

Article type
Paper
Submitted
19 Jun 2024
Accepted
19 Aug 2024
First published
05 Sep 2024

J. Mater. Chem. C, 2024,12, 15691-15703

Poly(vinyl alcohol)-assisted synthesis of 3D Bi2S3 submicrometric structures for feasible chip photodetector applications

K. Mistewicz, M. Godzierz, A. Gawron, Ł. Otulakowski, A. Hercog, K. Kurtyka, S. Hajra and H. J. Kim, J. Mater. Chem. C, 2024, 12, 15691 DOI: 10.1039/D4TC02565B

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