论文信息 - Short-circuit current enhancement in Bragg stack multi-quantum-well solar cells for multi-junction space cell applications

Short-circuit current enhancement in Bragg stack multi-quantum-well solar cells for multi-junction space cell applications

Abstract GaInP/GaAs tandem cells are limited by the current generated in the bottom GaAs junction. Strain-balanced multi-quantum well (MQW) solar cells offer a way of achieving a lower band gap for the lower junction, whilst retaining the lattice parameter of GaAs, and avoiding non-radiative recombination through dislocations. Further, the addition of a distributed Bragg reflector (DBR) allows the possibility of light not absorbed by the wells being reflected back into the structure, whilst allowing sub-well band-gap light through to a third Ge junction. Experimental results are presented from MQW cells grown with and without DBRs. These show a higher internal quantum efficiency in the 880 nm–1 μm region without detriment to the bulk response, when compared to MQW cells without DBRs.

[1] J. Ermer,et al. Experimental results of GaInP/sub 2//GaAs/Ge triple junction cell development for space power systems , 1996, Conference Record of the Twenty Fifth IEEE Photovoltaic Specialists Conference - 1996.

[2] T. E. Sale,et al. Cavity and reflector design for vertical cavity surface emitting lasers , 1995 .

[3] M. Pate,et al. Effect of strain relaxation on forward bias dark currents in GaAs/InGaAs multiquantum well p–i–n diodes , 1996 .

[4] Ian Forbes,et al. GaAsP/InGaAs strain-balanced quantum well solar cells , 2000 .

[5] R. Syms,et al. Structural Fabrication Using Cesium Chloride Island Arrays as a Resist in a Fluorocarbon Reactive Ion Etching Plasma , 1999 .

[6] J. P. Connolly,et al. Recent results on quantum well solar cells , 2003, 3rd World Conference onPhotovoltaic Energy Conversion, 2003. Proceedings of.

[7] U. Schubert,et al. MOVPE grown Ga1−xInxAs solar cells for GaInP/GaInAs tandem applications , 2000 .

[8] Martin A. Green. Two new efficient crystalline silicon light‐trapping textures , 1999 .

[9] J. P. Connolly,et al. Modeling the spectral response of the quantum well solar cell , 1993 .

[10] J. P. Connolly,et al. Strain-balanced GaAsP/InGaAs quantum well solar cells , 1999 .