US 2020/0271606 A1 · VERTICAL CHEMIRESISTOR GAS SENSOR

Abstract

A sensor for detecting and measuring a gas in a gaseous environment where the gaseous environment contains an interferent such as a related gas. A vertical chemiresistor with a top gate includes a semiconductor layer that has a bulk resistivity that changes in the presence of the gas and/or the interferent. The electrodes (103, 107) of the vertical chemiresistor have a work function that changes when the gas is absorbed onto the electrode. This absorption changes the work function of the electrode and thereby the contact resistance of the electrode in the vertical chemiresistor. By detecting changes in the contact resistance and the bulk resistivity of the semiconducting layer (105) the presence and the concentration of the gas may be determined and distinguished from the interferent.

Claims22

Dependent claims

A gas sensor comprising:

a first vertical chemiresistor comprising a bottom electrode supported on a substrate, a top electrode and an organic semiconducting layer disposed between the bottom and top electrodes, wherein the bottom electrode and organic semiconducting layer are positioned between the top electrode and the substrate;
and
a potential difference controller configured to apply a first potential difference and a second potential difference to the first vertical chemiresistor, wherein the first potential difference has a first polarity and the second potential difference has a second polarity and the first polarity is opposite to the second polarity, wherein the gas sensor is configured for detecting and/or measuring a first gas in an environment containing a second gas, wherein at least one of the first gas and second gas comprises an alkene.

Dependencies are inferred from the claim text.

Vertical chemiresistor gas sensor

Life of this patent

Vertical chemiresistor gas sensor

Life of this patent

Abstract

Claims22