Abstract
This chapter concentrates on the development of the intermediate band solar cell (IBSC) using InAs quantum dots (QD) embedded within an (Al,Ga)As single p-n junction. The growth and optimisation of the QD structures using molecular beam epitaxy (MBE) are discussed, and issues related to the manufacture of solar cell die for concentrator photovoltaic system applications are addressed. Advanced characterisation techniques have been employed to compare the performance of QD-IBSCs against reference (un-modified) single junction (Al,Ga)As cells, and results from these studies are assessed. It is concluded that the main operating principles of the IBSC have been demonstrated, including the generation of photo-current by the absorption of two sub-bandgap photons, and voltage preservation when thermal and/or tunnelling-assisted escape from the intermediate band are suppressed. However, efficiencies in excess of those for un-modified (Al,Ga)As reference cells have not yet been achieved.
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Acknowledgements
This work has been supported by the European Commission through grant number 211640, IBPOWER and NANOGEFFES (ENE2009-14481-C02-01) funded by the Spanish National Programmes. The authors are indebted to numerous colleagues at the University of Glasgow and the Universidad Politécnica de Madrid for their contributions to the work described in this chapter.
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Stanley, C.R., Farmer, C.D., Antolín, E., Martí, A., Luque, A. (2012). The Quantum Dot Intermediate Band Solar Cell. In: Cristóbal López, A., Martí Vega, A., Luque López, A. (eds) Next Generation of Photovoltaics. Springer Series in Optical Sciences, vol 165. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-23369-2_10
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