Integration of amorphous silicon photosensors with thin film interferential filter for biomolecule detection

Domenico Caputo, Emanuele Parisi, Augusto Nascetti, Mario Tucci, Giampiero de Cesare

Research output: Contribution to conferencePaper

Abstract

This work presents a thin film device, combining, on the same glass substrate, photosensors and long-pass interferential filter to achieve a compact and efficient sensor for biomolecule detection. The photosensors are amorphous silicon stacked structures, while the interferential filter is fabricated alternating layers of silicon dioxide and titanium dioxide, directly grown over the photosensors. The system has been optimized to effectively detect the natural fluorescence of Ochratoxin A, a highly toxic mycotoxin present in different food commodities. In particular, the long-pass interferential filter has been designed to reject the wavelengths arising from the excitation source (centered at 330 nm) thus transmitting the OTA emission spectrum (centered at 470 nm). Experimental results show that the filter strongly reduces the photosensors quantum efficiency below 420 nm, while keeps it nearly constant at higher wavelength.
Original languageEnglish
DOIs
Publication statusPublished - 2018
Externally publishedYes
Event3rd National Conference on Sensors, 2016 - Rome, Italy
Duration: 1 Jan 2018 → …

Conference

Conference3rd National Conference on Sensors, 2016
CountryItaly
CityRome
Period1/1/18 → …

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All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering

Cite this

Caputo, D., Parisi, E., Nascetti, A., Tucci, M., & de Cesare, G. (2018). Integration of amorphous silicon photosensors with thin film interferential filter for biomolecule detection. Paper presented at 3rd National Conference on Sensors, 2016, Rome, Italy. https://doi.org/10.1007/978-3-319-55077-0_16