A cross-functional nanostructured platform based on carbon nanotube-Si hybrid junctions: where photon harvesting meets gas sensing
Authors: Rigoni F., Pintossi C., Drera G., Pagliara S., Lanti G., Castrucci P., De Crescenzi M., Sangaletti L.
Autors Affiliation: Univ Cattolica Sacro Cuore, Surface Sci & Spect Lab I Lamp, Brescia, Italy; Univ Cattolica Sacro Cuore, Dipartimento Matemat & Fis, Brescia, Italy; Univ Brescia, CNR INO, Dept Informat Engn, Brescia, Italy; Univ Brescia, Sensor Lab, Brescia, Italy; Univ Roma Tor Vergata, Dipartimento Fis, Rome, Italy
Abstract: A combination of the functionalities of carbon nanotube (CNT)-Si hybrid heterojunctions is presented as a novel method to steer the efficiency of the photovoltaic (PV) cell based on these junctions, and to increase the selectivity and sensitivity of the chemiresistor gas sensor operated with the p-doped CNT layer. The electrical characteristics of the junctions have been tracked by exposing the devices to oxidizing (NO2) and reducing ( NH3) molecules. It is shown that when used as PV cells, the cell efficiency can be reversibly steered by gas adsorption, providing a tool to selectively dope the p-type layer through molecular adsorption. Tracking of the current-voltage curve upon gas exposure also allowed to use these cells as gas sensors with an enhanced sensitivity as compared to that provided by a readout of the electrical signal from the CNT layer alone. In turn, the chemiresistive response was improved, both in terms of selectivity and sensitivity, by operating the system under illumination, as the photo-induced charges at the junction increase the p-doping of CNTs making them more sensitive to NH3 and less to NO2.
Journal/Review: SCIENTIFIC REPORTS
Volume: 7 Pages from: 44413-1 to: 44413-12
KeyWords: HETEROJUNCTION SOLAR-CELLS; OPEN-CIRCUIT VOLTAGE; RECORD EFFICIENCY; PERFORMANCE; SENSORS; SENSITIVITY; NETWORKSDOI: 10.1038/srep44413Citations: 7data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-10-24References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here