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Electronic structure of QD arrays : application to intermediate-band solar cells

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Tomic, Stanko, Harrison, Nicholas (Nicholas M.) and Jones, T. S. (Tim S.) (2008) Electronic structure of QD arrays : application to intermediate-band solar cells. In: 7th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD '07), Univ Delaware, Newark, DE, Sep 24-27, 2007. Published in: Optical and Quantum Electronics, Volume 40 (Numbers 5-6). pp. 313-318. ISSN 0306-8919. doi:10.1007/s11082-008-9228-3

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Official URL: http://dx.doi.org/10.1007/s11082-008-9228-3

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Abstract

Intermediate band solar cells (IBSC) have been proposed as a potential design for the next generation of highly efficient photo-voltaic devices. Quantum nanostructures, such as quantum dots (QD), arranged in super-lattice (SL) arrays produce a mini-band (IB) that is separated by a region of zero density of states from other states in the conduction band. Additional absorption from the valence band to the IB and IB to the conduction band allows two photons with energies below the energy gap to be harvested in generating one electron-hole pair. We present a theoretical study of the electronic and optical properties of the IB formed by an InAs/GaAs QD array. The calculations are based on an 8-band k.p Hamiltonian, incorporating mixing between valence and conduction states, strain and piezoelectric field. Theoretical results of the the mini-band width variation with the period of the QD array in the z direction are presented. For one particular spacer distance, d(z) = 4 nm, we report detailed variation of the optical dipole matrix elements through the mini-band and identify the character of the states involved. This approach,captures the essential physics of the absorption processes in a realistic model of the IBSC structure and will be used to provide input parameters for predictive modelling of transport properties.

Item Type: Conference Item (UNSPECIFIED)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QC Physics
Divisions: Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH): Solar cells, Quantum dots, Semiconductors
Journal or Publication Title: Optical and Quantum Electronics
Publisher: Springer New York LLC
ISSN: 0306-8919
Official Date: April 2008
Dates:
DateEvent
April 2008Published
Volume: Volume 40
Number: Numbers 5-6
Number of Pages: 6
Page Range: pp. 313-318
DOI: 10.1007/s11082-008-9228-3
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Title of Event: 7th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD '07)
Type of Event: Conference
Location of Event: Univ Delaware, Newark, DE
Date(s) of Event: Sep 24-27, 2007

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