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

Abstract

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. Index Terms-Energy selective contacts (ESCs), multicolor detector, quantum dots (QDs).

Photocurrent improvement of an ultra-thin silicon solar cell using the localized surface plasmonic effect of clustering nanoparticles

“…Solar energy plays an essential role in a wide range of renewable energy sources, and many investments have been made in research to improve efficiency of solar cells. [1][2][3][4][5][6][7][8][9][10][11][12] However, price of electricity from solar energy is higher than the energy produced by conventional energy sources. [13][14][15] By combining low production costs and reasonable performance, thin-film photovoltaics are an attractive option to reduce the total cost per Watt of solar energy.…”