Optoelectronic refractometric sensing device for gases based on dielectric bow-ties and amorphous silicon solar cells



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Elshorbagy, Mahmoud Hamdy Mohamed and Esteban Martínez, Óscar and Cuadrado Conde, Alexander and Alda, Javier (2022) Optoelectronic refractometric sensing device for gases based on dielectric bow-ties and amorphous silicon solar cells. Scientific reports, 12 (18355). 9 p.. ISSN 2045-2322

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Official URL: https://doi.org/10.1038/s41598-022-21299-w


The transformation of an hydrogenated amorphous silicon solar cell (aSiH) into an optoelectronic refratometric sensor has been possible through the addition of dielectric bow-tie resonant structures. The indium transparent oxide top electrode is replaced by a thin metallic layer to selectively prevent the direct transmission of light to the active layer of the cell. Then, an array of dielectric bow-tie structures is placed on top of this electrode, to activate the optical absorption through surface plasmon resonance (SPR). The whole device is exposed to the analyte under measure, which is the surrounding medium. Three different dielectric materials with low, medium, and high refractive index were selected for the bow-ties, namely magnesium fluoride (MgF2), silicon dioxide (SiO2), and aluminum nitride (AlN) have been tested as coupling structure for SPR excitation. The maximization of the readout/short circuit current has been achieved through the geometrical parameters of such structure. We have selected the geometrical parameters to maximize the short circuit current delivered by the a-Si cell at a given selected wavelength. The design has been customized to gas measurements application, where the index of refraction is slightly above 1 around 10−4. Our analysis reveals ultra-high sensitivity of 2.4×104 (mA/W)/RIU, and a figure of merit FOM= 107 RIU−1, when the bow-tie is made of SiO2. A performance rally competitive with those previously reported in literature, with the additional advantage of circunventing both moving parts and spectral interrogation elements.

Item Type:Article
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Received: 27 May 2022; Accepted: 26 September 2022;
Published: 01 November 2022
An Author Correction to this article was published on 02 February 2023

Uncontrolled Keywords:Nanoscale advices; Nanoscience and technology; Optics and photonics
Subjects:Medical sciences > Optics > Optical materials
Medical sciences > Optics > Geometrical and instumental optics
Medical sciences > Optics > Optoelectronics
Medical sciences > Optics > Physical optics
ID Code:76711
Deposited On:17 Feb 2023 19:58
Last Modified:19 Apr 2023 17:07

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