These authors contributed equally to this work.
Paper presented at 25th EU PVSEC WCPEC-5, Valencia, Spain, 2010
Recent results for single-junction and tandem quantum well solar cells
Article first published online: 19 JAN 2011
Copyright © 2011 John Wiley & Sons, Ltd.
Progress in Photovoltaics: Research and Applications
Special Issue: 25th EU PVSEC WCPEC-5, Valencia, Spain, 2010
Volume 19, Issue 7, pages 865–877, November 2011
How to Cite
Adams, J. G. J., Browne, B. C., Ballard, I. M., Connolly, J. P., Chan, N. L. A., Ioannides, A., Elder, W., Stavrinou, P. N., Barnham, K. W. J. and Ekins-Daukes, N. J. (2011), Recent results for single-junction and tandem quantum well solar cells. Prog. Photovolt: Res. Appl., 19: 865–877. doi: 10.1002/pip.1069
- Issue published online: 19 OCT 2011
- Article first published online: 19 JAN 2011
- Manuscript Revised: 16 SEP 2010
- Manuscript Received: 27 MAY 2010
- quantum well;
- concentrator cells;
The band gap of the quantum well (QW) solar cell can be adapted to the incident spectral conditions by tailoring the QW depth. The single-junction strain-balanced quantum well solar cell (SB-QWSC) has achieved an efficiency of 28.3%. The dominant loss mechanism at the high concentrator cell operating bias is due to radiative recombination, so a major route to further efficiency improvement requires a restriction of the optical losses. It has been found that (100) biaxial compressive strain suppresses a mode of radiative recombination in the plane of the QWs. As biaxial strain can only be engineered into a solar cell on the nanoscale, SB-QWSCs are seen to have a fundamental efficiency advantage over equivalent bulk cells. Strain-balanced quantum wells in multi-junction solar cells can current match the sub-cells without the introduction of dislocations. Calculations are shown which predict efficiency limits as a function of QW absorption and band gap for such cells. A dual-junction InGaP/GaAs solar cell with QWs in the bottom sub-cell has been grown and characterized. Laboratory and calculated efficiencies relative to control cells are presented for the reported cell and a modeled device, respectively. Copyright © 2011 John Wiley & Sons, Ltd.