Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 60, Issue SB, Pages -Publisher
IOP Publishing Ltd
DOI: 10.35848/1347-4065/abde2b
Keywords
heteroepitaxial growth; dislocation density; solar cells; high-efficiency; tandem; III-V compound semiconductor; Si
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Funding
- NEDO
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The study discusses the effectiveness of low-temperature growth of III-V layers on Si substrates for achieving low-density dislocations, demonstrating a low dislocation density in GaAs-on-Si. This low dislocation density shows high potential efficiency for III-V/Si tandem solar cells.
Si tandem solar cells are attractive for new applications such as photovoltaic-powered vehicles because of their high-efficiency and low-cost potential. In particular, III-V/Si tandem solar cells have higher efficiency potential compared to perovskite/Si and other Si tandem solar cells. Although the direct growth of III-V layers on Si is very attractive for cost reduction and simple processing potential, high-quality growth of the III-V thin-film layer on Si is necessary. The paper discusses the effectiveness of the low-temperature growth of III-V layer on Si substrates for realizing low-density dislocations on Si substrates. Low dislocation density of less than 3 x 10(5) cm(-2) in GaAs-on-Si by low-temperature growth is demonstrated in this study. According to our analytical results, this low dislocation density shows high potential efficiency of more than 33% and 38% for III-V/Si 2-junction and 3-junction tandem solar cells, respectively.
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