Modeling Multiple Quantum Well and Superlattice Solar Cells
- 1 Department of Physics, University of Pinar del Río, Pinar del Río, Cuba
- 2 Solar Cell Laboratory, Institute of Materials Science and Technology (IMRE), University of Havana, Havana, Cuba
- 3 Solar Cell Laboratory, Institute of Materials Science and Technology (IMRE), University of Havana, Havana, Cuba; Higher School in Physics and Mathematics, National Polytechnic Institute, Mexico City, Mexico
- 4 Academic Unit of Physics, Autonomous University of Zacatecas, Zacatecas, México; Faculty of Physics, University of Havana, La Habana, Cuba
- 5 Nanophotonics Technology Center, Universidad Politécnica de Valencia, Valencia, Spain
- 6 Academic Unit of Physics, Autonomous University of Zacatecas, Zacatecas, México
- 7 Academic Unit of Physics, Autonomous University of Zacatecas, Zacatecas, México
Abstract
The inability of a single-gap solar cell to absorb energies less than the band-gap energy is one of the intrinsic loss mechanisms which limit the conversion efficiency in photovoltaic devices. New approaches to “ ultra-high ” efficiency solar cells include devices such as multiple quantum wells (QW) and superlattices (SL) systems in the intrinsic region of a p-i-n cell of wider band-gap energy (barrier or host) semiconductor. These configurations are intended to extend the absorption band beyond the single gap host cell semiconductor. A theoretical model has been developed to study the performance of the strain-balanced GaAsP/InGaAs/GaAs MQWSC, and GaAs/GaInNAs MQWSC or SLSC. Our results show that conversion efficiencies can be reached which have never been obtained before for a single-junction solar cell.
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