Table of Contents
ISRN Renewable Energy
Volume 2012, Article ID 862790, 5 pages
Research Article

Limiting Solar Cell Heat-Up by Quantizing High Energy Carriers

Department of Electrical and Computer Engineering, Advanced Electronic Technology Center, 1 University Avenue, Lowell, MA 01854, USA

Received 25 April 2012; Accepted 3 June 2012

Academic Editors: O. O. Fasina and M. Zoulias

Copyright © 2012 L. Devarakonda and S. Mil'shtein. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Under solar radiation the efficiency of solar cells decreases as a result of heating up by short wavelengths photons. To minimize loss of efficiency with increasing temperatures, we designed a heterostructure AlGaAs/AlGaAs/GaAs cascaded p-i-n solar cells with 30 Å wide quantum wells and 10 Å wide barriers in p and i regions. Our modeling demonstrated that quantizing high energy carriers in the superlattice prevents scattering of excessive electron energies, thus decreasing the temperature rise per unit of time by a factor of 2. The modeling based on continuity equations included integration of absorption coefficients for various wavelengths and summarizes all thermodynamic heat exchanges in the designed solar cell.