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GaInNAsSb HIGH EFFICIENCY SOLAR CELLS: PHYSICS AND PRACTICE
A. Aho, A. Tukiainen, V. Polojärvi, and M. Guina
Optoelectronics Research Centre / Tampere University of Technology, P.O. Box 692
FIN-33101 Tampere, Finland
email: arto.j.aho@tut.fi
III-V multi junction solar cells [l] are the work-horses for concentrated and space
photovoltaic systems, enabling the record high conversion efficiency of 44.7% [2].
However, there is a strong drive towards developing even better materials and concepts
towards breaking the 50% level. As a part of our approach, we are developing 1 eV
band gap GaInNAsSb heterostructures grown by molecular beam epitaxy. Based on calculations, GaInP/GaAs/GaInNAsSb/Ge solar cells can exhibit several percentage points
higher efficiency than standard GaInP/GaAs/Ge solar cells [3].
2
Jsc (mA/cm )
18
16
14
14
Maximal Jsc for 0.9 eV GaInNAsSb
2
20
Active area Jsc (mA/cm )
22
Maximal Jsc for 1.0 eV GaInNAsSb
GaInP/GaAs current limited
GaInNAsSb current limited
12
10
8
6
Achievement (AM1.5)
4
2008
2010 2012 2014
Development year
2016
FF=86%
12
FF=81%
10
8
6
4 AM1.5 simulation
GaInP/GaAs/GaInNAs
2
GaInP/GaAs
0
0.0
0.5
1.0
1.5
2.0
Voltage (V)
2.5
3.0
Figure 1. a) Achieved and theoretical short-circuit current densities (Jsc) of GaInNAsSb
solar cells capped by a thick GaAs film. b) Light-biased current–voltage characteristics
of GaInP/GaAs and GaInP/GaAs/GaInNAs solar cells.
Here we present the performance of GaInP/GaAs/GaInNAs(Sb) multijunction solar
cells that are closely current matched to the top GaInP/GaAs junctions. Currently, the
short circuit current density is limited by the GaInNAsSb junction to ~13 mA/cm2 (see
Fig. 1). The average external quantum efficiency of the GaInNAs(Sb) junction is ~72%,
while ~81% is required for current matching. Based on the measured solar cell properties and simulations [3], we estimate that efficiency of 50% can be reached using
properly designed four junction solar cells under high light concentration.
[1]
[2]
[3]
A. Luque, J. Appl. Phys., 110 (2011) 031301.
F. Dimroth et al., Prog. Photovolt: Res. Appl. (2014), DOI: 10.1002/pip.2475.
A. Aho et al., Nano Scale Research Letters (2014, accepted)
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