Please use this identifier to cite or link to this item: https://doi.org/10.1002/pssa.201900238
Title: Development of Bifacial n-Type Front-and-Back Contact Cells with Phosphorus Back Surface Field via Mask-Free Approaches
Authors: Chen, Ning 
Wang, Er-Chien
Yan, Xia 
Shanmugam, Vinodh 
Nagarajan, Balaji
Zhang, Lin
Gong, Xinxin
Zhang, Xinyu
Wang, Qi
Jin, Hao
Duttagupta, Shubham 
Keywords: Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Materials Science
Physics
atmospheric pressure chemical vapor deposition
bifacial
mask-free approach
n-type front-and-back contact solar cells
HIGH-EFFICIENCY
SOLAR-CELLS
Issue Date: 9-Sep-2019
Publisher: WILEY-V C H VERLAG GMBH
Citation: Chen, Ning, Wang, Er-Chien, Yan, Xia, Shanmugam, Vinodh, Nagarajan, Balaji, Zhang, Lin, Gong, Xinxin, Zhang, Xinyu, Wang, Qi, Jin, Hao, Duttagupta, Shubham (2019-09-09). Development of Bifacial n-Type Front-and-Back Contact Cells with Phosphorus Back Surface Field via Mask-Free Approaches. PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE 216 (22). ScholarBank@NUS Repository. https://doi.org/10.1002/pssa.201900238
Abstract: © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Industrial bifacial n-type front-and-back contact (nFAB) solar cells consist of a boron-doped p+ emitter and a phosphorus-doped n+ back surface field (BSF). A conventional BSF formation method with tube-based POCl3 diffusion typically requires the use of a masking layer to protect the front emitter against cross doping or two wet-chemical etching steps. Herein, two alternative mask-free BSF formation approaches are investigated, either via phosphorus ion implantation or atmospheric pressure chemical vapor deposition (APCVD) of phosphosilicate glass (PSG). The fabricated cells indicate comparable efficiencies achievable by mask-free methods, as compared with conventional tube-based POCl3 diffusion. In addition, the APCVD process is further improved by optimizing the phosphorus contents in the PSG layer. Cell performances with different phosphorus contents and thus different BSF sheet resistances are studied. A lower phosphorus content (higher BSF's sheet resistance) improves cells' Jsc, whereas a higher phosphorous content results in high fill factor (FF) due to better rear contact resistance and low BSF sheet resistance. The optimized condition results in nFAB cell with a peak efficiency of 21.4% and FF values over 81.0%.
Source Title: PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
URI: https://scholarbank.nus.edu.sg/handle/10635/171639
ISSN: 18626300
18626319
DOI: 10.1002/pssa.201900238
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