Quantum wells for high-efficiency photovoltaics

Diego Alonso-Álvarez; Nicholas Ekins-Daukes

doi:10.1117/12.2217590

14 March 2016 Quantum wells for high-efficiency photovoltaics

Diego Alonso-Álvarez, Nicholas Ekins-Daukes

Proceedings Volume 9743, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices V; 974311 (2016) https://doi.org/10.1117/12.2217590
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

Over the last couple of decades, there has been an intense research on strain balanced semiconductor quantum wells (QW) to increase the efficiency of multi-junction solar (MJ) solar cells grown monolithically on germanium. So far, the most successful application of QWs have required just to tailor a few tens of nanometers the absorption edge of a given subcell in order to reach the optimum spectral position. However, the demand for higher efficiency devices requiring 3, 4 or more junctions, represents a major difference in the challenges QWs must face: tailoring the absorption edge of a host material is not enough, but a complete new device, absorbing light in a different spectral region, must be designed. Among the most important issues to solve is the need for an optically thick structure to absorb enough light while keeping excellent carrier extraction using highly strained materials. Improvement of the growth techniques, smarter device designs - involving superlattices and shifted QWs, for example - or the use of quantum wires rather than QWs, have proven to be very effective steps towards high efficient MJ solar cells based on nanostructures in the last couple of years. But more is to be done to reach the target performances. This work discusses all these challenges, the limitations they represent and the different approaches that are being used to overcome them.

Citation Download Citation

Diego Alonso-Álvarez and Nicholas Ekins-Daukes "Quantum wells for high-efficiency photovoltaics", Proc. SPIE 9743, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices V, 974311 (14 March 2016); https://doi.org/10.1117/12.2217590

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