Novel approaches for tri-crystalline silicon surface texturing
- Authors
- Han, K[Han, Kyumin]; Thamilselvan, M[Thamilselvan, M.]; Kim, K[Kim, Kyunghae]; Ju, M[Ju, Minkyu]; Kim, YK[Kim, Young Kuk]; Moon, I[Moon, Inyong]; Lee, K[Lee, Kyungsoo]; Kyung, D[Kyung, Dohyun]; Kwon, T[Kwon, Taeyoung]; Yi, J[Yi, Junsin]
- Issue Date
- Jun-2009
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Tri-crystalline silicon; Texturization; Solar cells efficiencies
- Citation
- SOLAR ENERGY MATERIALS AND SOLAR CELLS, v.93, no.6-7, pp.1042 - 1046
- Indexed
- SCIE
SCOPUS
- Journal Title
- SOLAR ENERGY MATERIALS AND SOLAR CELLS
- Volume
- 93
- Number
- 6-7
- Start Page
- 1042
- End Page
- 1046
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/77661
- DOI
- 10.1016/j.solmat.2008.11.036
- ISSN
- 0927-0248
- Abstract
- Tri-crystalline silicon (Tri-Si) is a promising candidate to reduce the cost of solar cells fabrication because it can be made by a low-cost, fast process with a better mechanical strength, and needs a thinner wafer. One of the key parameters in improving the efficiency of the Tri-Si solar cells is the reflectance, which can be lowered by etching methods. However, Tri-Si is a crystal compound consisting of three mutually tilted monocrystalline silicon grains. In all grains boundaries the surface is (110)-oriented. A standard surface texture of etched random pyramids using an anisotropic etchant, such as NaOH, is not achievable here. In this paper, for the first time, a novel texturing method has been attempted, which consisted of two steps-HF:HNO(3):DI (2.5:2.5:5) etching was followed by exposure to the vapors to generate fine holes and an etching depth of 2.5 mu m had been reached. A best result of 12.3% has been achieved for surface reflectance, which is about 10% lower than that using normal acidic texturing. Nanoporous structures were formed and the size of the porous structure varied from 5 to 10 nm. An antireflection coating of SiN(x) SLAR was used to optimize the reflectance. A fill factor of 0.78 has been reached with an efficiency of 16.2% in 12.5 cm x 12.5 cm. This high efficiency is mainly due to an increased short-circuit current density of 34 mA/cm(2). (C) 2008 Elsevier B.V. All rights reserved.
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