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Table of contents
Contents
Acknowledgements
Abstract
Résumé
General introduction
Introduction to photovoltaics and light management
1.1 Photovoltaics: towards high-efficiency solar cells
1.1.1 Principle of photovoltaic conversion of solar energy
1.1.2 Novel concepts for high-efficiency PV conversion of solar energy
1.2 Light management for quantum-structured IBSCs
1.2.1 Lambertian scattering PV light trapping
1.2.2 Application to quantum-structured solar cells
Conclusion
Fabrication and nanofabrication for quantum structured solar cells
2.1 Sample fabrication
2.1.1 Stacking design and growth
2.1.2 Device fabrication
2.1.3 Additional processes
2.2 Epitaxial transfer processes
2.2.1 Etch stop layer technique
2.2.2 Sacrificial layer technique
2.3 Nanofabrication
2.3.1 Soft nanoimprint lithography
2.3.2 Application to solar cells
QD-IBSC system: from ideal to experimental PV material
3.1 Description of QD-IBSCs system for light management implementation
3.1.1 Choice of material: In(Ga)As QDs in Al0.2GaAs host material
3.1.2 Position of QD layers
3.2 Fabrication of QDs absorber suitable for IBSCs
3.2.1 Growth of QDs by MBE
3.2.2 Control and improvement of QDs growth
3.3 Investigation and modeling of QDs properties
3.3.1 QDs interactions with host material: thermal and electrical properties
3.3.2 Simulation of different QDs: shape, aspect ratio, QWIs, WL, In content .
3.4 QDs absorption: simulation and experimental determination
3.4.1 Absorption from k.p calculation
3.4.2 Absorption measurements
Intermediate band dynamic study to evidence novel PV concept
4.1 Calibrated photoluminescence
4.1.1 Characterization setup
4.1.2 Balance of photons
4.1.3 Quasi-fermi level splitting
4.2 Two-color excitation photoluminescence
4.2.1 Characterization setup
4.2.2 IR pump effect on photoluminescence
4.2.3 Steady-state rate equation model
4.3 Potential of a hot carrier thermally activated QD-IBSC or IB-HCSC
4.3.1 IB-CB QFL splittings
4.3.2 Fermi-Dirac distribution inside QDs
4.3.3 Potential efficiency of a thermally activated QD-IBSC
Light management strategies applied to quantum-structured solar cells
5.1 Application to multi-quantum well solar cells
5.1.1 Fabry-Pérot cavity effect on MQW solar cells
5.1.2 Nanopatterns effect on MQW solar cells
5.2 Application to quantum dot solar cells
5.2.1 Fabry-Pérot effect on QDSCs
5.2.2 Nanopatterns strategy for QDSCs
Conclusion
Conclusion and perspectives
Appendices
A. Fabrication protocols
B. InGaAs QD growth issues
C. Method to fit the PL from a QD ensemble
References
