Back surface field properties with different surface conditions for crystalline silicon solar cells
- Authors
- Kim, H.; Kim, S.; Park, S.; Song, J.; Kim, Y.D.; Tark, S.J.; Kwon, S.; Yoon, S.; Son, C.-S.; Kim, D.
- Issue Date
- 2011
- Keywords
- Back surface field (BSF); Flat back surface; Ramp up rates; Silicon solar cells; Textured back surface
- Citation
- Korean Journal of Materials Research, v.21, no.5, pp.243 - 249
- Indexed
- SCOPUS
KCI
- Journal Title
- Korean Journal of Materials Research
- Volume
- 21
- Number
- 5
- Start Page
- 243
- End Page
- 249
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/114590
- DOI
- 10.3740/MRSK.2011.21.5.243
- ISSN
- 1225-0562
- Abstract
- To reduce manufacturing costs of crystalline silicon solar cells, silicon wafers have become thinner. In relation to this, the properties of the aluminium-back surface field (Al-BSF) are considered an important factor in solar cell performance. Generally, screen-printing and a rapid thermal process (RTP) are utilized together to form the Al-BSF. This study evaluates Al-BSF formation on a (111) textured back surface compared with a (100) flat back surface with variation of ramp up rates from 18 to 89°C/s for the RTP annealing conditions. To make different back surface morphologies, one side texturing using a silicon nitride film and double side texturing were carried out. After aluminium screen-printing, Al-BSF formed according to the RTP annealing conditions. A metal etching process in hydrochloric acid solution was carried out to assess the quality of Al-BSF. Saturation currents were calculated by using quasi-steady-state photoconductance. The surface morphologies observed by scanning electron microscopy and a non-contacting optical profiler. Also, sheet resistances and bulk carrier concentration were measured by a 4-point probe and hall measurement system. From the results, a faster ramp up during Al-BSF formation yielded better quality than a slower ramp up process due to temperature uniformity of silicon and the aluminium surface. Also, in the Al-BSF formation process, the (111) textured back surface is significantly affected by the ramp up rates compared with the (100) flat back surface.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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