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The thermal time constant distribution of a photovoltaic panel has been measured experimentally. A wide spectrum, ranging between a few milliseconds and a few hours, has been detected. A simple thermal analysis can only explain time constants up to 500s. It was found that the lateral heat diffusion inside the solar cells was responsible for the observed phenomena. The reason was the top finger-shaped...
When very fast phenomena and small structure dimensions are involved, the classical law of Fourier becomes inaccurate. A more sophisticated model is then needed to describe the thermal conduction mechanisms in a physically acceptable way. In this paper the according diffusion equation is solved for a nano-scaled semiconductor substrate, in order to gain physical insight in the problem. Analytical...
Przedstawiono prostą metodę pomiaru aktywnej powierzchni krzemu dowolnego elementu elektronicznego. Metoda jest bezinwazyjna i może być zastosowana do dowolnego urządzenia, jeśli tylko występuje w nim złącze p-n. Opiera się ona na pomiarze odpowiedzi termicznej elementu. Układ poddany jest wymuszeniu jednostkowemu mocy, w wyniku czego następuje nagrzewanie się elementu. Wartość napięcia na złączu...
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