Materials, systems and methods for optoelectronic devices
A photodetector is described along with corresponding materials, systems, and methods. The photodetector comprises an integrated circuit and at least two optically sensitive layers. A first optically sensitive layer is over at least a portion of the integrated circuit, and a second optically sensitive layer is over the first optically sensitive layer. Each optically sensitive layer is interposed between two electrodes. The two electrodes include a respective first electrode and a respective second electrode. The integrated circuit selectively applies a bias to the electrodes and reads signals from the optically sensitive layers. The signal is related to the number of photons received by the respective optically sensitive layer.
1. A method comprising:
providing a plurality of pixel regions, each pixel region having a respective first electrode and a respective second electrode;
varying the voltage of the respective first electrode of each respective pixel region during an integration period of time independently of the voltage of the respective first electrode of other pixel regions in the plurality of pixel regions;
reading out a signal from each of the pixel regions based on the intensity of light absorbed by an optically sensitive layer for the respective pixel region during the integration period of time; and
varying the voltage of the respective second electrode for all of the pixel regions.