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Over 20% Efficiency Mechanically Stacked Multi-Junction Solar Cells Fabricated by Advanced Bonding Using Conductive Nanoparticle Alignments

Published online by Cambridge University Press:  29 May 2013

Kikuo Makita
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST) AIST Tsukuba, Central 2, Umezono 1-1-1, Tsukuba, Ibaraki, 305-8568, JAPAN
Hidenori Mizuno
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST) AIST Tsukuba, Central 2, Umezono 1-1-1, Tsukuba, Ibaraki, 305-8568, JAPAN
Hironori Komaki
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST) AIST Tsukuba, Central 2, Umezono 1-1-1, Tsukuba, Ibaraki, 305-8568, JAPAN
Takeyoshi Sugaya
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST) AIST Tsukuba, Central 2, Umezono 1-1-1, Tsukuba, Ibaraki, 305-8568, JAPAN
Ryuji Oshima
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST) AIST Tsukuba, Central 2, Umezono 1-1-1, Tsukuba, Ibaraki, 305-8568, JAPAN
Hajime Shibata
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST) AIST Tsukuba, Central 2, Umezono 1-1-1, Tsukuba, Ibaraki, 305-8568, JAPAN
Koji Matsubara
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST) AIST Tsukuba, Central 2, Umezono 1-1-1, Tsukuba, Ibaraki, 305-8568, JAPAN
Shigeru Niki
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST) AIST Tsukuba, Central 2, Umezono 1-1-1, Tsukuba, Ibaraki, 305-8568, JAPAN
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Abstract

This paper shows a new semiconductor bonding technology for mechanically stacked multi-junction solar cells. Our strategy is the combination of conductive nanoparticle alignments and the van der Waals bonding technique. With this method, reasonably low bonding resistances and minimal optical absorption losses were simultaneously attained for the use of mechanically stacked solar cells. We examined a GaInP(Eg-1.89 eV)/GaAs (Eg-1.42 eV)/InGaAsP (Eg-1.15 eV) three-junction solar cell fabricated with this bonding method. As a result, the total efficiency of 22.5% was achieved, which was in good agreement with the theoretically predicted value. These results suggested that our bonding method is highly useful to fabricate high-efficiency mechanically stacked multi-junction solar cells.

Type
Articles
Copyright
Copyright © Materials Research Society 2013 

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References

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