Light-addressable electrodes (LAEs) based on semiconductor materials are used for applications in lab-on-chip systems.These electrodes enable precise, localized control of photoelectrocatalytic reactions by light as a trigger. Combined with a light-addressable potentiometric sensor (LAPS), the system is able to spatio-temporal manipulate and monitor pH changes whereby the “active area” for both systems is only predefined by the illuminated area.

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