DIAGNOSTICS OF POTENTIAL INDUCED DEGRADATION IN PHOTOVOLTAICS

Vladimír Šály*, Michal Váry*, Viktor Schlosser**, Juraj Packa*, Milan Perný*, Eduard Firický*, Ondrej Kulich*, and Vladimír Ďurman

*Slovak University of Technology, FEI, Ilkovičova 3, SK-81219 Bratislava, Slovak Republic

** University of Vienna, Faculty of Physics, Strudlhofgasse 4, A-1090 Vienna, Austria

ABSTRACT -The aim of this paper is the investigation of electrical and mechanical properties of solar cells assembled into modules, before and after accelerated ageing. It was shown that impedance spectroscopy measurement and characterization is an important tool to reveal the degradation due to high voltage stress and increased temperature stress. The mechanical parameters were derived from natural vibration measurements. Important differences between the results of measurements were found before and after stressing the modules.

Keywords- Solar cells and modules, Accelerated ageing, High voltage stress, Impedance spectroscopy