MODELING OF LIGHT-ADDRESSABLE POTENTIOMETRIC SENSORS

In this paper, the extension of numerical simulation techniques to the analysis of light-addressable potentiometric sensors (LAPS) is discus sed in detail, To this purpose, proper physical models of both the ion -sensitive and the photo-sensitive transduction mechanisms have been i ncorporated into the framework of a general-purpose device simulator, A self-consistent, accurate picture of charge transport within the dev ice under the combined action of electrolyte ion layers and of luminou s stimulus is recovered, which in turn, allows for detailed analysis o f the device behavior and for fine-tuning of fabrication process. Exte nsive comparison with actual LAPS measurement has been performed, vali dating the tool and illustrating its flexibility and application range .