Virtuani, Alessandro and Fanni, Lorenzo (2012) Seasonal power fluctuations of amorphous silicon thin film PV modules: distinguishing between different contributions. Progress in Photovoltaics, 22 (2). pp. 208-217. ISSN 1099-159X
Full text not available from this repository.Abstract
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. It is hence difficult to assess—for a given location and climatic conditions—which one has the largest impact. By means of a straightforward approach based on two sets of single-junction a-Si photovoltaic modules (stored indoors/exposed outdoors) and on two different I–V measurement set-ups (indoor and outdoor), we were able to separate the different contributions to this phenomenon. For the test-site of Lugano, 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%). Moreover, the influence of spectral variations on the outdoor performance of a-Si (and for comparison of c-Si) was modeled, and the experimental data were found to be in excellent agreement with the theoretical simulation; (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). Because of the position (46°N) and average climatic conditions (southern Alpine climate) of Lugano, these observations are possibly representative of a large part of continental Europe.
| Item Type: | Scientific journal article, Newspaper article or Magazine article |
|---|---|
| Subjects: | Physical sciences > Materials science Physical sciences > Physics |
| Department/unit: | Dipartimento ambiente costruzioni e design > Istituto sostenibilità applicata all'ambiente costruito |
| Depositing User: | Alessandro Virtuani |
| Date Deposited: | 19 Jul 2013 07:53 |
| Last Modified: | 18 May 2016 07:03 |
| URI: | http://repository.supsi.ch/id/eprint/2587 |
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