TITLE

Chemical images generated by large area homogeneous illumination of metal–insulator–semiconductor structures

AUTHOR(S)
Filippini, D.; Lundström, I.
PUB. DATE
May 2003
SOURCE
Applied Physics Letters;5/26/2003, Vol. 82 Issue 21, p3791
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A controlled large area illumination, provided by a computer screen, is used to induce distinctive chemical images in field-effect devices upon gas exposure. The present measuring method uses the concurrent optical and chemical modulation of the semiconductor surface potential of a single metal-oxide-semiconductor capacitor to generate two-dimensional photocurrent images, displayed in a bias voltage-color space. Selective patterns for hydrogen, ammonia, and propene are demonstrated. The use of a computer screen as a programable light source allows to simplify a normally complex setup, making the technique more attractive for practical applications.
ACCESSION #
9815431

 

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