Device Architecture and Lifetime Requirements for High Efficiency Multicrystalline Silicon Solar Cells

Conference · Mon Mar 23 04:00:00 EDT 2015

OSTI ID:1229759

Wagner, H. ^[1]; Hofstetter, J.; Mitchell, B.; Altermatt, P.; Buonassisi, T.

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1. Arizona State University

We present a numerical simulation study of different multicrystalline silicon materials and solar cell architectures to understand today's efficiency limitations and future efficiency possibilities. We compare conventional full-area BSF and PERC solar cells to future cell designs with a gallium phosphide heteroemitter. For all designs, mc-Si materials with different excess carrier lifetime distributions are used as simulation input parameters to capture a broad range of materials. The results show that conventional solar cell designs are sufficient for generalized mean lifetimes between 40 – 90 μs, but do not give a clear advantage in terms of efficiency for higher mean lifetime mc-Si material because they are often limited by recombination in the phosphorus diffused emitter region. Heteroemitter designs instead increase in cell efficiency considerable up to generalized mean lifetimes of 380 μs because they are significantly less limited by recombination in the emitter and the bulk lifetime becomes more important. In conclusion, to benefit from increasing mc-Si lifetime, new cell designs, especially heteroemitter, are desirable.

• Research Organization: Massachusetts Institute of Technology
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: EE0006335
• OSTI ID: 1229759
• Report Number(s): DOE-ASU-6335-008
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY