Photovoltaic cells energy performance enhancement with down-converting photoluminescence phosphors

Summary Phosphors, synthesized by the urea homo‐precipitation method, were examined as ultraviolet‐spectral down conversion materials for improving the light absorption and electrical characteristics of commercial single‐junction silicon solar cells. The photovoltaic (PV) cells were coated with erbium and terbium doped gadolinium oxysulfide phosphors encapsulated in ethyl vinyl‐acetate binder using blade screen printing technique, and the optimum concentration of phosphor in the composite resulted in the largest light conversion, and superior electrical output and energy transfer efficiency. Moreover, the results demonstrated that the composition of dispersed phosphors has a strong influence on the amount of ultraviolet‐light converted and electron transition capacity of PV cells. The experimental results showed in an optimized PV cell, an enhancement of 0.54% (from 12.11% to 12.65%) in the energy conversion of a Si‐based PV cell was achieved. Copyright © 2015 John Wiley & Sons, Ltd. Gd2O2S‐based phosphors were examined as spectral down conversion material to enhance the efficiency of silicon solar cells using a low‐cost implementation method to form a luminescent layer on top of the cells. In this study, a wide range of characterization tools were utilized to clearly understand the separate and combined effects of the ethyl vinyl‐acetate (EVA) binder and phosphor on the solar cells performance, and the results suggest that the role of the EVA is as important as the phosphor.