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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
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 |
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| 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: |
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| 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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