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Article Dans Une Revue Advanced Optical Materials Année : 2013

Highly Efficient Infrared Quantum Cutting in Tb3+− Yb3+ Codoped Silicon Oxynitride for Solar Cell Applications

Résumé

A high efficiency infrared quantum cutting effect in a Tb3+–Yb3+ codoped silicon oxynitride system is demonstrated. The thin films are deposited on Si substrates by reactive magnetron co-sputtering of a Si target topped with Tb4O7 and Yb2O3 chips under pure nitrogen plasma. The photoluminescence dynamics are investigated, revealing a quantum efficiency of this system at 980 nm up to 197% for the higher Yb3+ concentration. Thus, via a cooperative transfer mechanism between Tb3+ and Yb3+, an absorbed UV–visible photon gives rise to almost two emitted IR photons. Such a down-conversion effect is demonstrated upon indirect excitation of energy donors, via defect states in the host matrix. These down-converter films could be directly and easily integrated on top of the Si-based solar cell to improve the photoelectric conversion efficiency at a lower cost. An evaluation of the additional external quantum efficiency is deduced from this optical system and found to be almost 2%.
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hal-01138682 , version 1 (03-04-2017)

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Yong-Tao An, Christophe Labbé, Julien Cardin, Magali Noelle Valerie Morales, Fabrice Gourbilleau. Highly Efficient Infrared Quantum Cutting in Tb3+− Yb3+ Codoped Silicon Oxynitride for Solar Cell Applications. Advanced Optical Materials, 2013, 1 (11), pp.855-862. ⟨10.1002/adom.201300186⟩. ⟨hal-01138682⟩
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