Vieira, ManuelaFernandes, MiguelFantoni, AlessandroLouro, Paula2012-03-222012-03-222004-09-21VIEIRA, Manuela; [et al] – A non-pixel image reader for continuous image detection based on tandem heterostructures. Sensors and Actuators A-Physical. ISSN 0924-4247. Vol. 115, N.º 2-3 (2004), pp. 191-195.0924-4247http://hdl.handle.net/10400.21/1334An optically addressed read-write sensor based on two stacked p-i-n heterojunctions is analyzed. The device is a two terminal image sensing structure. The charge packets are injected optically into the p-i-n writer and confined at the illuminated regions changing locally the electrical field profile across the p-i-n reader. An optical scanner is used for charge readout. The design allows a continuous readout without the need for pixel-level patterning. The role of light pattern and scanner wavelengths on the readout parameters is analyzed. The optical-to-electrical transfer characteristics show high quantum efficiency, broad spectral response, and reciprocity between light and image signal. A numerical simulation supports the imaging process. A black and white image is acquired with a resolution around 20 mum showing the potentiality of these devices for imaging applications.engTandem structuresHeterojunctionImage sensorElectrical and numerical simulationjournal article10.1016/j.sna.2004.01.030