Back to Search Start Over

Porous Si-SiO2 UV Microcavities to Modulate the Responsivity of a Broadband Photodetector

Authors :
María R. Jimenéz-Vivanco
Godofredo García
Jesús Carrillo
Francisco Morales-Morales
Antonio Coyopol
Miguel Gracia
Rafael Doti
Jocelyn Faubert
J. Eduardo Lugo
Source :
Nanomaterials, Vol 10, Iss 2, p 222 (2020)
Publication Year :
2020
Publisher :
MDPI AG, 2020.

Abstract

Porous Si-SiO2 UV microcavities are used to modulate a broad responsivity photodetector (GVGR-T10GD) with a detection range from 300 to 510 nm. The UV microcavity filters modified the responsivity at short wavelengths, while in the visible range the filters only attenuated the responsivity. All microcavities had a localized mode close to 360 nm in the UV-A range, and this meant that porous Si-SiO2 filters cut off the photodetection range of the photodetector from 300 to 350 nm, where microcavities showed low transmission. In the short-wavelength range, the photons were absorbed and did not contribute to the photocurrent. Therefore, the density of recombination centers was very high, and the photodetector sensitivity with a filter was lower than the photodetector without a filter. The maximum transmission measured at the localized mode (between 356 and 364 nm) was dominant in the UV-A range and enabled the flow of high energy photons. Moreover, the filters favored light transmission with a wavelength from 390 nm to 510 nm, where photons contributed to the photocurrent. Our filters made the photodetector more selective inside the specific UV range of wavelengths. This was a novel result to the best of our knowledge.

Details

Language :
English
ISSN :
20794991
Volume :
10
Issue :
2
Database :
Directory of Open Access Journals
Journal :
Nanomaterials
Publication Type :
Academic Journal
Accession number :
edsdoj.2cd70958a2414052befab3f2b840c851
Document Type :
article
Full Text :
https://doi.org/10.3390/nano10020222