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Feature Paper and Cover of Energies published by CNR-IMM and EGP researchers, entitled "Reversible Efficiency Variation of Tandem Amorphous/Microcrystalline Si Photovoltaic Modules in Outdoor Operation", by FR Galluzzo, C Gerardi, A Canino, and S. Lombardo.

Amorphous Si multijunction PV modules are subjected to instability phenomena due to the Staebler-Wronski effect. We performed outdoor tests to study the effect of operating temperature and incident solar spectrum. Experimental results show clear correlation between performance improvements and PV module thermal history.

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