Photovoltaic Schedule efficiency related to surface temperature - PhotovoltaicPerformanceSimple

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Hi, how can I create a schedule for PhotovoltaicPerformanceSimple, specific in the field "convertion efficiency input model" and "efficiency schedule name". I need to relate the surface of painel temperature (shade group) to the convertion effiency, or at last the external air temperature (from wheather file). I need to compare the effiency of different technologies, I think it could be like a schedule in equation or a text file iput in format of table like X temperature = Y efficiency, but I did not found where. Someone did something like that?

Thank you.