There is about 0.86% (abs) cell efficiency reduction on the monolike cells that contain large sub-grains.Д¬ast monolike silicon solar cells are a new type of photovoltaic (PV) cell that has drawn a lot of attention in PV industry recently. The (311) grains contain high density of dislocation and cannot be effectively textured by alkaline solution, therefore lowering the cell efficiency significantly. The large sub-grains at corner brick wafers are oriented at (311), instead of (100) orientation. The mono grain in the interior brick is nearly perfect, but there are some large oblong shaped sub-grains in the corner brick. Monolike silicon wafers from two different bricks cut from interior and corner region of an ingot were compared. This paper investigates crystalline orientation in monolike silicon wafers and its effect on solar cell performance. Keywords: Monolike Defects Grain Orientation Cell Efficiency Woodruff School of Mechanical Engineering, Atlanta, USA 3University Center of Excellence for Photovoltaic Research and Education, Georgia Institute of Technology, Atlanta, USA.Д®mail: November 16 th, 2012 revised December 17 th, 2012 accepted January 15 th, 2013 1Georgia Tech Manufacturing Institute, Atlanta, USA 2The George W.

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