Modelling of Light-Addressable Potentiometric Sensors

In this paper, the extension of numerical simulationtechniques to the analysis of light-addressable potentiometricsensors (LAPS) is discussed in detail. To this purpose, properphysical models of both the ion-sensitive and the photo-sensitivetransduction mechanisms have been incorporated into the framework of a general-purpose device simulator. A self-consistent, accurate picture of charge transport within the device under the combined action of electrolyte ion layers and of luminous stimulus is recovered, which in turn, allows for detailed analysis of the device behavior and for fine-tuning of fabrication process. Extensive comparison with actual LAPS measurement has been performed, validating the tool and illustrating its flexibility and application range.