Transient behavior of adjustable threshold a-Si:H/a-SiC:H three-color detector

In this paper, we investigate the transient behavior of a-Si:H/a-SiC:H adjustable-threshold three-color detectors (ATCDs) for applications in bidimensional large area image sensors. Red, green, and blue color sensing in the charge integration regime is demonstrated, and the transient mechanisms of charge and discharge of the equivalent capacitance are discussed by means of load curve diagrams. The possibility of driving 2-D arrays of ATCDs is discussed by means of a test circuit simulating the row select TFT and the data line capacitance by discrete components. Readout times on the microsecond timescale and saturation times three orders of magnitude greater have been obtained under 0.1 mW/cm² illumination, resulting in the possibility of scanning 1000 rows. Finally, an equivalent circuit is introduced and solved by AIM-SPICE, and simulations of the static and dynamic behavior are presented