NDLI: Over 30% efficiency triple-junction GainP/GaAs/Ge quantum well solar cells

Content Provider	IEEE Xplore Digital Library
Author	Rubin Liu Chaogang Lou Wei Gao Shuai Wang Qiang Sun
Copyright Year	2011
Description	Author affiliation: Tianjin Institute of Power Sources, Tianjin 300381, P. R. China (Rubin Liu; Wei Gao; Shuai Wang; Qiang Sun) \|\| Department of Electronics, Southeast University, Nanjing 210096, P. R. China (Chaogang Lou)
Abstract	Increasing the conversion efficiency of a triple-junction GalnP/GaAs/Ge solar cell has been a challenge for a long time. One of the difficulties is the mismatched currents among three subcells because the middle cell has the lowest photocurrent while the bottom cell has the highest photocurrent. Some efforts have been taken to improve the problem, such as the growth of metamorphic layers, four junctions, increasing the bandgap of the top cell and reducing the thickness of the top cells. This paper presents a new effort to increase the photocurrent of the middle cell by introducing multi-quantum wells (MQWs) into its intrinsic region because the multi-quantum wells can lower the bandgap of the middle cell and keep good material quality by reaching balanced strain in epitaxial layers. Experimental results have shown that the triple junction solar cells with the multi-quantum wells can reach the conversion efficiency of 30.89% (AM0), higher than that of control cells. Including the multi-quantum wells can increase the short-circuit currents and decrease the open-circuit voltage. The influences of the multi-quantum wells on the solar cells are also discussed.
Starting Page	000133
Ending Page	000135
File Size	79857
Page Count	3
File Format	PDF
ISBN	9781424499663
ISSN	01608371
e-ISBN	9781424499656
DOI	10.1109/PVSC.2011.6185861
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Photovoltaic cells Quantum well devices Junctions Gallium arsenide Photoconductivity Photonic band gap Photonics
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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