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Light Trapping In Solar Cells And Determination Of The Absorbed Energy By Calorimetry

Light trapping plays an important role for solar cells prepared from materials having an indirect bandgap such as crystalline Si. Electronically the performance of a thin Si cell can be superior to that of a thick cell, however, it will absorb IR-light less efficiently than a thick cell. Therefore, in order to be able to profit from the higher electronic performance, one has to make a thin cell which absorbs IR-light equally well as a thick cell. For this purpose we propose a light trapping scheme based on diffraction optics. Rectangular submicron gratings with a period of 0.3 μm and a depth of less than 0.2 μm in SIPOS are shown to give optimum light trapping.