Fluoride crystals (BaY2F8) doped with Er3 + ions with different doping level have been grown with a home-made Czochralski furnace. A spectroscopic characterization consisting in both absorption and fluorescence measurements were performed in order to investigate the upconversion mechanism occurring when the material is excited with a radiation at 1557 nm. The measured emission spectrum shows a photoluminescence mainly distributed in the Near Infrared (NIR) region at 1 um. The spectral conversion due to the upconversion makes this material suitable for photovoltaic applications, especially if we combine it with a crystalline silicon solar cell. A device made of single face solar cell þupconverter material (PV-UC) was designed and his external quantum efficiency (EQE) at 1557 nm was measured. EQE values of 6.5% and 4.1% were reached under 8.5 W cm–2 power density illumination for the 30%Er3 + and 20%Er3 + samples, respectively.
BaY2F8 doped with Er3+: an upconverter material for photovoltaic application
BOCCOLINI, ALESSANDRA;FAORO, RAFFAELE;FAVILLA, ELENA;VERONESI, STEFANO;TONELLI, MAURO
2013-01-01
Abstract
Fluoride crystals (BaY2F8) doped with Er3 + ions with different doping level have been grown with a home-made Czochralski furnace. A spectroscopic characterization consisting in both absorption and fluorescence measurements were performed in order to investigate the upconversion mechanism occurring when the material is excited with a radiation at 1557 nm. The measured emission spectrum shows a photoluminescence mainly distributed in the Near Infrared (NIR) region at 1 um. The spectral conversion due to the upconversion makes this material suitable for photovoltaic applications, especially if we combine it with a crystalline silicon solar cell. A device made of single face solar cell þupconverter material (PV-UC) was designed and his external quantum efficiency (EQE) at 1557 nm was measured. EQE values of 6.5% and 4.1% were reached under 8.5 W cm–2 power density illumination for the 30%Er3 + and 20%Er3 + samples, respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
