Shrinking and Growing: Grain Boundary Density Reduction for Efficient Polysilicon Thin-Film Solar Cells
- Authors
- Kim, Dong Rip; Lee, Chi Hwan; Weisse, Jeffrey M.; Cho, In Sun; Zheng, Xiaolin
- Issue Date
- Dec-2012
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Polycrystalline Si; micropillar-seeded growth; thin-film solar cells; radial junction; light trapping
- Citation
- NANO LETTERS, v.12, no.12, pp.6485 - 6491
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANO LETTERS
- Volume
- 12
- Number
- 12
- Start Page
- 6485
- End Page
- 6491
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/164059
- DOI
- 10.1021/nl3041492
- ISSN
- 1530-6984
- Abstract
- Polycrystalline Si (poly-Si) thin-film, due to its low Si consumption, low substrate cost, and good stability, is an attractive candidate for cost-effective solar cells, but the as-deposited poly-Si typically has a columnar structure with grain boundaries in between, severely limiting the efficiency of the poly-Si. Here, we report a micropillar poly-Si solar cell that utilizes the columnar structure of the as-deposited poly-Si grains. We first formed submicrometer diameter poly-Si pillars, smaller than the initial grain sizes, and used these pillars as the seeds for the subsequent epitaxial growth of Si, which effectively reduces grain boundary density in the final poly-Si crystal. In addition, the vertically aligned micropillar arrays form radial p-n junctions that further mitigate the grain boundary recombination losses by improving the light absorption and charge-carrier collection efficiencies. Consequently, the maximum efficiency of rnicropillar poly-Si thin-film solar cells is 6.4%, that similar to 1.5, times higher than that of the planar cells.
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