A New Proposal for Simultaneous Multicolor Detection Based on Quantum Dots and Selective Energy Contacts

In this paper, simultaneous multiwavelength detection using quantum dots (QDs) and energy selective contacts is investigated. This detection can be achieved by intersubband and interband transitions in QD-based superlattices. Here, we show that attaching a double-barrier resonant tunneling to the QD-based active layer solves the basic problem of carrier extraction from each discrete energy level to individual electrodes (as a multicontact package). The mini-band energy levels and corresponding wave functions for arrays of QDs are calculated using the 2-D Schrodinger equation. We present simultaneous multiwavelength detection by QD structures with selective contacts for the first time according to the best of our knowledge. This paper opens the way to new strategies in the engineering and the fabrication of simple detectors for multiband radiation detection. In addition, for more clarification, photocurrent and dark current of photodetector with two independent output paths are obtained.