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Direct Semiconductor Bonded 5J Cell for Space and Terrestrial Applications

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11 Author(s)
Chiu, P.T. ; Spectrolab Inc., Sylmar, CA, USA ; Law, D.C. ; Woo, R.L. ; Singer, S.B.
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Spectrolab has demonstrated a 2.2/1.7/1.4/1.05/0.73 eV 5J cell with an efficiency of 37.8% under 1 sun AM1.5G spectrum and 35.1% efficiency for 1 sun AM0. The top three junctions and bottom two junctions were grown on GaAs and InP substrates, respectively, by metal organic vapor phase epitaxy. The GaAs- and InP-based cells were then direct bonded to create a low-resistance, high-transmissive interface. Both the space and terrestrial cells have high 1 sun Voc between 4.75 and 4.78 V. Initial tests of the terrestrial cells at concentration are promising with efficiencies increasing up to 10× concentration to a maximum value close to 41%.

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Photovoltaics, IEEE Journal of  (Volume:4 ,  Issue: 1 )