ELECTRICAL CHARACTERIZATION OF THIN FILM CHALCOGENIDE GLASSES FOR GAS SENSORS

CONDE GARRIDO, J. M.; MARIA ANDREA UREÑA; RODRIGUEZ CUELLAR, O.; SILVEYRA, J. M.

Montpellier

Conferencia; ECASIA 2017, European Conference on Applications of Surface and Interface Analysis; 2017

Among the several applications that chalcogenide glasses have, one of the latest is their useas sensitive materials for the detection of gases. Although many materials have beensuccessfully tested as sensitive membrane for gas sensors, chalcogenide glasses have theadvantage of not requiring high temperatures for the detection of gasses. Tellurium basedmembranes were the subject of many investigations during the last decade [1], but otherchalcogenide systems are being studied as well [2,3].In this work, we studied the electrical properties of GeTe and GeSe3 thin film glassesdeposited by pulsed laser deposition (PLD). We measured the conductivity of the films byDC measurements and AC spectroscopy. We performed the measurements under varioustemperatures and under vacuum and NO2 atmospheres. We encountered in both systems thattheir conductivity changes in the presence of NO2, which means that they are both goodoptions for sensing NO2. On account of these results, in future work, we will study whetherthe addition of other elements to the membrane will improve the electrical response of thesensor.