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Investigation of coupling effects through Photoluminescence Spectroscopy

pubblicazioni - Memoria

Investigation of coupling effects through Photoluminescence Spectroscopy

Sono stati studiati gli accoppiamenti ottici tra diverse giunzioni di una cella fotovoltaica a tripla giunzione utilizzando come sorgente di eccitazione il segnale di fotoluminescenza emesso da un’altra sottocella eccitata a sua volta con una sorgente laser.

Optical interactions between different junctions in a tandem photovoltaic (PV) cell – referred to as “luminescent coupling”- have been investigated in triple junction devices with different structures using excitation dependent photoluminescence (PL) spectroscopy. A lattice matched and an upright metamorphic device have been used. The results show how the radiative emission from each junction of the tandem changes in the presence of different light intensity and wavelength.

At each light bias intensity, different voltage biases have been applied to the device in order to demonstrate the impact of voltage on the radiative emission. Differences between radiative recombination have been detected for different material structures indicating different coupling effects in each device.

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