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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2010

Carrier multiplication in bulk and nanocrystalline semiconductors : mechanism, efficiency, and interest for solar cells

Résumé

Carrier multiplication (CM), the possibility to generate more than one exciton in a semiconductor quantum dot (QD) after absorption of a single photon has been intensely debated in recent years. Following on previous theoretical and experimental work, we report here that: (1) although the CM factor (i.e., number of generated photons per absorbed photon) at a given photon energy is higher in bulk than in QDs of the same material [Pijpers et al., Nature Phys. 5, 811 (2009)], the energy efficiency (the relative fraction of the photon energy that is transformed into excitons rather than heat) is higher in QDs; (2) for the same ∼1.2 eV band gap, CM is more efficient in PbSe QDs than in bulk silicon; (3) nonetheless, the efficiency of solar cells based on PbSe QDs is not significantl enhanced by CM compared to a bulk silicon-based device
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hal-00549046 , version 1 (21-12-2010)

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Christophe Delerue, Guy Allan, Joep J. H. Pijpers, Mischa Bonn. Carrier multiplication in bulk and nanocrystalline semiconductors : mechanism, efficiency, and interest for solar cells. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2010, 81, pp.125306-1-6. ⟨10.1103/PhysRevB.81.125306⟩. ⟨hal-00549046⟩
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