Is AM1.5 applicable in practice? Modelling eight photovoltaic materials with respect to light intensity and two spectra

Solar cell comparison is generally based on an arbitrary maximum terrestrial intensity and spectra (of 1 sun, 1000 W/m2) at 25 °C perpendicular to the cell plane [1] referred to by specialists as AM1.5. In practice, no solar cell experiences such conditions, yet few alternative bases for comparison exist [2]. Our interest in this paper is to explore the correct design of indoor Photovoltaic (IPV) products. Given that the indoors, when compared with the outdoors, are characterised by much lower radiant energy intensities, various spectra (including artificial light sources), complete comparison data for indoor conditions are not freely available. More general level reports have been published [3–6].