Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 75, Issue 1-2, Pages 261-269Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0927-0248(02)00168-X
Keywords
multi-junction solar cells; InGaP; tunnel junction; high conversion efficiency; concentrator
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As a result of top cell material quality improvement, development of optically and electrically low-loss double-hetero structure tunnel junction, photon and carrier confinements, and lattice-matching between active cell layers and substrate, the last 15 years have seen large improvements in III-V compound multi-junction (MJ) solar cells. In this paper, present status of R&D program for super-high-efficiency MJ cells in the New Sunshine Project in Japan is presented. InGaP/InGaAs/Ge monolithic cascade 3-junction cells with newly recorded efficiency of 31.7% at AM1.5 (1-sun) were achieved on Ge substrates, in addition to InGaP/GaAs//InGaAs mechanically stacked 3-junction cells with world-record efficiency of 33.3%. Future prospects for realizing super-high-efficiency and low-cost MJ solar cells are also discussed. (C) 2002 Published by Elsevier Science B.V.
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