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. 2022 Oct 25;22(21):8155.
doi: 10.3390/s22218155.

Two-Dimensional (PEA)2PbBr4 Perovskites Sensors for Highly Sensitive Ethanol Vapor Detection

Ching-Ho Tien  1 , Kuan-Lin Lee  2 , Chun-Cheng Tao  2 , Zhan-Qi Lin  2 , Zi-Hao Lin  2 , Lung-Chien Chen  2
Affiliations

Two-Dimensional (PEA)2PbBr4 Perovskites Sensors for Highly Sensitive Ethanol Vapor Detection

Ching-Ho Tien et al. Sensors (Basel). .

Abstract

Two-dimensional (2D) perovskite have been widely researched for solar cells, light-emitting diodes, photodetectors because of their excellent environmental stability and optoelectronic properties in comparison to three-dimensional (3D) perovskite. In this study, we demonstrate the high response of 2D-(PEA)2PbBr4 perovskite of the horizontal vapor sensor was outstandingly more superior than 3D-MAPbBr3 perovskite. 2D transverse perovskite layer have the large surface-to-volume ratio and reactive surface, with the charge transfer mechanism, which was suitable for vapor sensing and trapping. Thus, 2D perovskite vapor sensors demonstrate the champion current response ratio R of 107.32 under the ethanol vapors, which was much faster than 3D perovskite (R = 2.92).

Keywords: (PEA)2PbBr4; detection; ethanol sensor; lead halide perovskites; two-dimensional perovskite.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Crystal structure of 2D-(PEA)2PbBr4; (b) Schematic diagram of the 2D-(PEA)2PbBr4 alcohol vapor sensor; (c) Gas sensing measurement setup schematic.
Figure 2
Figure 2
3D and 2D perovskites sensing samples. (a) 3D MAPbBr3, (b) 2D (PEA)2PbBr4 with different spin speeds.
Figure 3
Figure 3
Current–voltage (I–V) curves of 3D-6500rpm-MAPbBr3 and 2D-6500rpm-(PEA)2PbBr4 perovskites after exposure to 95% (v/v) ethanol vapor.
Figure 4
Figure 4
Low and high magnification field-emission scanning electron microscope (FESEM) images of (a,c) 3D-6500rpm-MAPbBr3 and (b,d) 2D-6500rpm-(PEA)2PbBr4 perovskites.
Figure 5
Figure 5
Comparison of (a) photoluminescence (PL) intensities and (b) X-ray diffraction (XRD) patterns of 3D-6500rpm-MAPbBr3 and 2D-6500rpm-(PEA)2PbBr4 perovskites.
Figure 6
Figure 6
(a) Optical absorption spectra and (b) (αhν)2 vs. energy plot of 2D-(PEA)2PbBr4 with different spin speeds.
Figure 7
Figure 7
(a–c) Top view and (d–f) cross-section field-emission scanning electron microscope (FESEM) images of 2D-(PEA)2PbBr4 films formed with different spin speeds.
Figure 8
Figure 8
X-ray diffraction (XRD) patterns of 2D-(PEA)2PbBr4 films formed with different spin speeds.
Figure 9
Figure 9
Photoluminescence (PL) intensities of 2D-(PEA)2PbBr4 films formed with different spin speeds in ethanol vapors environment. (a) 2D-5500rpm-(PEA)2PbBr4 film. (b) 2D-6500rpm-(PEA)2PbBr4 film. (c) 2D-7500rpm-(PEA)2PbBr4 film.
Figure 10
Figure 10
(a) Current–voltage (I–V) curves and (b) response ratio ranges of 2D-(PEA)2PbBr4 films formed at different spin coating speeds to ethanol vapors.
Figure 11
Figure 11
(a) Current–time (I–T) curves of 2D-(PEA)2PbBr4 films formed with different spin speeds in ethanol vapors environment. (b) Sensor response of 2D-6500rpm-(PEA)2PbBr4 vapor sensor after exposure to different concentrations of ethanol vapors.
Figure 12
Figure 12
Schematic ethanol vapors sensing mechanism of 2D-(PEA)2PbBr4 perovskite.
See this image and copyright information in PMC

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