Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Multicrystalline Silicon Texturing for Large Area CommercialSolar Cell of Low Cost and High Efficiency

  • Dhungel, S.K. (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Karunagaran, B. (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Kim, Kyung-Hae (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Yoo, Jin-Su (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • SunWoo, H. (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Manna, U. (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Gangopadhyay, U. (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Basu, P.K. (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Mangalaraj, D (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Yi, J. (School of Information and Communication Engineering, Sungkyunkwan University)
  • Published : 2004.11.11
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Abstract

Multicrystalline silicon wafers were textured in an alkaline bath, basically using sodium hydroxide and in acidic bath, using mainly hydrofluoric acid (HF), nitric acid $(HNO_3)$ and de-ionized water (DIW). Some wafers were also acid polished for the comparative study. Comparison of average reflectance of the samples treated with the new recipe of acidic solution showed average diffuse reflectance less than even 5 percent in the optimized condition. Solar cells were thus fabricated with the samples following the main steps such as phosphorus doping for emitter layer formation, silicon nitride deposition for anti-reflection coating by plasma enhanced chemical vapor deposition (PECVD) and front surface passivation, screen printing metallization, co-firing in rapid thermal processing (RTP) Furnace and laser edge isolation and confirmed >14 % conversion efficiency from the best textured samples. This isotropic texturing approach can be instrumental to achieve high efficiency in mass production using relatively low cost silicon wafers as starting material.

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