期刊
OPTICS EXPRESS
卷 24, 期 10, 页码 -出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.24.00A740
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资金
- JST-CREST
- JSPS KAKENHI [26610081, 26390075]
- Photon Frontier Network Program of MEXT
- JST-SENTAN
- China Scholarship Council
- Grants-in-Aid for Scientific Research [15H03968, 26610081, 26390075, 14F04907] Funding Source: KAKEN
We calculated the conversion-efficiency limit eta(sc) and the optimized subcell bandgap energies of 1 to 5 junction solar cells without and with intermediate reflectors under 1-sun AM1.5G and 1000-sun AM1.5D irradiations, particularly including the impact of internal radiative efficiency (eta(int)) below unity for realistic subcell materials on the basis of an extended detailed-balance theory. We found that the conversion-efficiency limit eta(sc) significantly drops when the geometric mean eta(int)* of all subcell eta(int) in the stack reduces from 1 to 0.1, and that eta(sc) degrades linearly to log eta(int)* for eta(int)* below 0.1. For eta(int)*<0.1 differences in eta(sc) due to additional intermediate reflectors became very small if all subcells are optically thick for sun light. We obtained characteristic optimized bandgap energies, which reflect both eta(int)* decrease and AM1.5 spectral gaps. These results provide realistic efficiency targets and design principles. (C) 2016 Optical Society of America.
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