Alessandro Virtuani and Lorenzo Fanni Seasonal power fluctuations of amorphous silicon thin-film solar modules: distinguishing between different contributions Progress in Photovoltaics: Research and Applications 22
Several works report on seasonal fluctuations of power production of amorphous silicon (a-Si). These oscillations are due to two overlapping phenomena (i) spectral and (ii) the Staebler–Wronski effects. In this work, we separate between the different contributions to this phenomenon. For the test-site of Lugano (46°N), seasonal oscillations account for performance variations of a-Si of ~10% (±5% around an annual average value with a minimum around the mid of January and a maximum around mid-July). The time-phase of the overall effect lies in between that of the two distinguished phenomena. (i) Spectral variations seem to have the highest impact on the outdoor performance of a-Si with an amplitude corresponding to 10.5% (± ~5.2%); (ii) the Staebler–Wronski effect has a slightly lower influence with an amplitude of ~8% (±4% with a minimum at the middle of February and a maximum around mid-August).
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