Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 46, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202208377
Keywords
crystalline silicons; radial junctions; silicon microwires; solar cells; wafer-scales
Categories
Funding
- National Research Foundation of Korea (NRF) - Korean Government (MSIP) [NRF-2020R1A4A1019568, NRF-2019R1A2C2086602, NRF- 2019M1A2A2065614, NRF-2022R1C1C2004320, NRF-2021R1F1A1064243, NRF- 2022R1C1C1010025]
- Carbon Neutral Institute Research Fund of UNIST (Ulsan National Institute of Science Technology) [1.220098.01]
- Development Program of the Korea Institute of Energy Research (KIER) [C2-2402]
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This study aims to demonstrate that conventional fabrication techniques can be applied to MW-based solar cells at wafer scale while maintaining high efficiency. The results show that increasing the device size can significantly improve the open-circuit voltage and fill factor by reducing recombination losses at the device edge.
Microwire (MW)-based radial junction crystalline silicon (c-Si) solar cells have great potential as an emerging energy device with an efficiency of over 20%. However, the competitive efficiency of MW-based c-Si solar cells in realizing a wafer-scale device is limiting its commercialization. In this study, the aim is to demonstrate that conventional fabrication techniques can be applied to MW-based solar cells while not only increasing the size from the lab-scale to the wafer-scale but also retaining an efficiency of >20%. Surprisingly, an improvement in open-circuit voltage and fill factor is observed with an increase in device size, due to the reduction of recombination loss at the device edge. Finally, a successful demonstration of 21.1% efficiency at 4-inch wafer-scale (25 cm(2)) in c-Si MW solar cell is observed, while an efficiency of 20.6% at a lab-scale size (1 cm(2)) is observed.
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