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Characterization of Strained Layer Superlattice Solar Cells by X-ray Diffraction and Current-Voltage Measurements

  • Joshua P. Samberg (a1), Conrad Zachary Carlin (a2), Nadia A. El-Masry (a3), Geoffrey K. Bradshaw (a4), Peter C. Colter (a5), Jeffrey L. Harmon (a6), Salah M. Bedair (a7) and John R. Hauser (a8)...

Abstract

InGaAs can be used to enhance the response of solar cells past the 1.43 eV cutoff of GaAs. Strained-layer superlattice (SLS) structures with high indium and phosphorus compositions (up to 35% and 68% respectively) have been grown successfully. SLS solar cells with indium and high phosphorus compositions (up to 15% and 85% respectively) have been grown successfully. The spectral response of the solar cells has been extended to as low as 1.27 eV. This enhancement is also shown by an increase in the short circuit current, with a small reduction in the short circuit voltage as compared to standard GaAs p-n junction for AM1.5 and one sun.

Dark current curves show the extent of recombination in the superlattice. The reverse saturation current in the recombination region (0.2-0.8 V) was determined using a non-linear least squares fitting routine. An Arrhenius plot was generated by finding the reverse saturation current over a temperature range of 300-370 K. The low recombination devices show non-ideality constants of 1.7 with activation energies of 1.3-1.4 eV. The high recombination devices have non-ideality constants (˜2.3) and lower activation energies of 1.1 eV.

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1 Katsuyama, T. Bedair, S.M. Giles, N.C. Burns, R.P. Schetzina, J.F.Growth and characterization of InGaAs/GaAsP strained layer superlattices,” J. Appl. Phys., vol. 62, July. 1987, pp. 4985002
2 Katsuyama, T. Tischler, M.A. Moore, D. Hamaguchi, N. Elmasry, N.A. Bedair, S.M.. “New approaches for high efficiency cascade solar cells,” Solar Cells, vol 21, Issues 1-4, June-August 1987, pp. 413418
3 Ekins-Daukes, N. J., Kawaguchi, K. and Zhang, J. “Strain-Balanced Criteria for Multiple Quantum Well Structures and Its Signature in X-ray Rocking Curves,” Cryst. Growth Des., 2002, pp. 287292
4 Bushnell, D.B. Barnham, K.W.J. Connolly, J.P. Ekins-Daukes, N.J., Airey, R. Hill, G. Roberts, J.S., Nasi, L. “Effect of barrier composition and well number on the dark-current of quantum well solar cells,” Proceedings of WCPEC-3, Osaka, May 2003, pp. 2706
5 Bushnell, D.B. Ekins-Daukes, N.J., Barnham, K.W.J. Connolly, J.P. Roberts, J.S. Hill, G. Airey, R., Mazzer, M. “Short-circuit Current Enhancement in Bragg Stack Multi-quantum-well Solar Cells for Multi-junction Space Cell Applications,” Solar Energy Materials & Solar Cells, Volume 75, 2003, pp. 299305

Keywords

Characterization of Strained Layer Superlattice Solar Cells by X-ray Diffraction and Current-Voltage Measurements

  • Joshua P. Samberg (a1), Conrad Zachary Carlin (a2), Nadia A. El-Masry (a3), Geoffrey K. Bradshaw (a4), Peter C. Colter (a5), Jeffrey L. Harmon (a6), Salah M. Bedair (a7) and John R. Hauser (a8)...

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