The influence of spectral variation on the efficiency single-, double- and triple-junction amorphous silicon has been investigated. The average photon energy(APE) proves to be a useful device-independent parameter for quantifying the average hue incident spectra. Single-junction devices increase in as light becomes blue shifted, because more of incident spectrum lies within the absorption window less in the redlinfra-red tail; this is denoted the spectral effect. Double- and triple-junction also exhibit a secondary spectral effect due to between the device structure and the incident. These both reach a maximum efficiency, which off as light is red or blue shifted. The effect is more for triple-junction than double-junction, as mismatch between junctions is statistically likely.
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Betts et al. (2003) studied this question.