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Effect of Sub-Grains and Crystal Defects on Monolike Si Solar Cell Performance
Georgia Tech Manufacturing Institute, Atlanta, USA
The George W. Woodruff School of Mechanical Engineering, Atlanta, USA
University Center of Excellence for Photovoltaic Research and Education, Georgia Institute of Technology, Atlanta, USA
- 1 Georgia Tech Manufacturing Institute, Atlanta, USA
- 2 The George W. Woodruff School of Mechanical Engineering, Atlanta, USA
- 3 University Center of Excellence for Photovoltaic Research and Education, Georgia Institute of Technology, Atlanta, USA
Materials Sciences and Applications·Volume 04 (2013)·Pages 103–108·Published 25 February 2013·DOI10.4236/msa.2013.42011
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Abstract
This paper investigates crystalline orientation in monolike silicon wafers and its effect on solar cell performance. Monolike silicon wafers from two different bricks cut from interior and corner region of an ingot were compared. The mono grain in the interior brick is nearly perfect, but there are some large oblong shaped sub-grains in the corner brick. The large sub-grains at corner brick wafers are oriented at (311), instead of (100) orientation. The (311) grains contain high density of dislocation and cannot be effectively textured by alkaline solution, therefore lowering the cell efficiency significantly. There is about 0.86% (abs) cell efficiency reduction on the monolike cells that contain large sub-grains.
KeywordsMonolikeDefectsGrain OrientationCell Efficiency
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