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The effect of rapid thermal annealing on the optical properties of InxAl1−xAsySb1−y was analyzed and compared to that for In0.52Al0.48As. Initial ellipsometry and photoluminescence experiments performed before the annealing indicate the presence of a low energy Urbach tail in the absorption spectrum. Rapid thermal annealing produces a blue-shift in the PL emission when annealed at 650°C for 60s and...
In recent years, the implementation of bandgap engineering techniques for solar energy conversion has been demonstrated with exciting results, using both quantum wells (QWs) and quantum dots. Here, the exploitation of a fully lattice-matched QW / barrier system is introduced as an attractive new possibility for this type of device. Photovoltaic characterization is performed and relevant solar cell...
The balance of photogeneration and recombination gives rise to an optimum bandgap for any solar cell. The radiative limit represents the lowest permissible level of recombination in a solar cell and, therefore, places an upper limit on the voltage that can be attained. Introducing additional nonradiative recombination results in a loss in voltage that can only be compensated for by moving to higher...
A design for a realistically achievable, multijunction solar cell based on all lattice-matched materials with >50% projected efficiencies under concentration is presented. Using quaternary materials such as InAlAsSb and InGaAlAs at stochiometries lattice-matched to InP substrates, direct bandgaps ranging from 0.74eV up to ∼1.8eV, ideal for solar energy conversion, can be achieved. In addition,...
The thermal properties of 5-stage “W” Interband-Cascade Lasers emitting at 4.1µm at RT are investigated. It is shown that inter-valence band absorption coupled with non-radiative recombination govern their maximum operating temperature.
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