Abstract
Abstract For a successful realization of super-high efficiency solar cells, reduction of surface or interface recombination is required. Thus, it is important to know the value of the surface recombination velocity ( S ) for the optimization of the passivation technology and for the design of solar cells. In this paper, a photoluminescence (PL) based novel technique for the measurement of the value of S under sunlight is presented, and applied to variously passivated Si surfaces. S was found not to be constant but to depend strongly on the excitation intensity near and above 1 sun condition. The value of S is strongly reduced under concentrated sunlight indicating that concentration of sunlight or use of a thin film is effective for efficiency increase.
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