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Room-Temperature Wafer Bonded Multi-Junction Solar Cell Grown by Solid State Molecular Beam Epitaxy

Published online by Cambridge University Press:  08 June 2016

Shulong Lu  and
Shiro Uchida
Shulong Lu*
Affiliation:
Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, P. R. China
Shiro Uchida
Affiliation:
Chiba Institute of Technology, Narashino, Chiba 275-0016, Japan
*
*(Email: [email protected])
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Abstract

We studied the InGaP/GaAs//InGaAsP/InGaAs four-junction solar cells grown by molecular beam epitaxy (MBE), which were fabricated by the novel wafer bonding. In order to reach a higher conversion efficiency at highly concentrated illumination, heat generation should be minimized. We have improved the device structure to reduce the thermal and electrical resistances. Especially, the bond resistance was reduced to be the lowest value of 2.5 × 10-5 Ohm cm2 ever reported for a GaAs/InP wafer bond, which was obtained by the specific combination of p+-GaAs/n-InP bonding and by using room-temperature wafer bonding. Furthermore, in order to increase the short circuit current density (Jsc) of 4-junction solar cell, we have developed the quality of InGaAsP material by increasing the growth temperature from 490 °C to 510 °C, which leads to a current matching. In a result, an efficiency of 42 % at 230 suns of the four-junction solar cell fabricated by room-temperature wafer bonding was achieved.

Keywords

photovoltaicbondingmolecular beam epitaxy (MBE)
Type
Articles
Information
MRS Advances , Volume 1 , Issue 43: Energy and Environment , 2016 , pp. 2907 - 2916
Copyright
Copyright © Materials Research Society 2016 

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References

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