IOP
Refine
Year of publication
- 2014 (1)
Institute
- INB - Institut für Nano- und Biotechnologien (1) (remove)
Has Fulltext
- no (1)
Language
- English (1)
Document Type
- Article (1)
Zugriffsart
- bezahl (1)
Is part of the Bibliography
- no (1)
A novel photoexcitation method for the light-addressable potentiometric sensor (LAPS) is proposed to achieve a higher spatial resolution of chemical images. The proposed method employs a combined light source that consists of a modulated light probe, which generates the alternating photocurrent signal, and a ring of constant illumination surrounding it. The constant illumination generates a sheath of carriers with increased concentration which suppresses the spread of photocarriers by enhanced recombination. A device simulation was carried out to verify the effect of constant illumination on the spatial resolution, which demonstrated that a higher spatial resolution can be obtained.