Geometrical control of the interatomic coulombic decay process in quantum dots for infrared photodetectors. Issue 25 (25th July 2016)

• Record Type: Journal Article
• Authors: Dolbundalchok, Praphasiri; Peláez, Daniel; Aziz, Emad F.; Bande, Annika
• Is Part Of: Journal of computational chemistry. Volume 37:Issue 25(2016)
• Page Start: 2249
• Page End: 2259
• Publication Date: 2016-07-25
• Subjects: dynamics -- electronic‐structure -- energy exchange -- model -- systems; Chemistry -- Data processing -- Periodicals; 542.85
• DOI: 10.1002/jcc.24410
• Languages: English
• ISSNs: 0192-8651

Abstract

Abstract : In electron dynamics calculations the interatomic Coulombic decay (ICD) process has recently been shown to take place in two vertically‐aligned quantum dots (QDs). Energy emitted during the relaxation of one electron in one QD is converted into kinetic energy of another electron ejected from a neighboring QD. As the electronic structure of QDs can be controlled by their geometries, we prove here in thorough scans of the transversal and vertical QD confinement potentials' widths that geometries are likewise control parameters for ICD. Such a comprehensive investigation has been enabled by a significant development of the calculations in terms of speed achieved among others by optimization of the grid and Coulomb interaction operator representations. As key result of this study we propose two cigar‐shaped singly‐charged GaAs QDs vertically aligned in the direction of their long side for a most efficient QD ICD realization useful for an infrared photodetector. © 2016 Wiley Periodicals, Inc. Abstract : A next‐generation quantum dot (QD) infrared photodedector is proposed in which radiation absorption and electron emission are localized on either of two vertically‐aligned singly‐charged GaAs QDs among which an efficient energy transfer process, the interatomic Coulombic decay, is operative. Speed‐optimized highly‐accurate electron dynamics calculations on numerous architectures reveal how the performance may be custom‐made through tuning the QDs' geometries.