Programm Photovoltaik Ausgabe 2009 ... - Bundesamt für Energie BFE

The table below show the change of photocurrent for these 3 samples exposed to the 470 nm LED
light:
Table 2: Short-circuit photocurrent change over time during the 824 hour long blue 470 nm LED
irradiation.
Despite significant changes in the UV-VIS spectrum, the photocurrents did only change by 4 to 5 % for
the sample ECN780, containing the yellow dye CRS040 that almost completely vanished from the UV-
VIS absorption spectrum.
In order to improve the stability testing accuracy of the flat plate concentrators, we have built the
SolarTest-65 Light Soaking System based on a long-lived and spectrally stable “Plasma Lamp”,
providing solar-like light (Class A simulator):
Fig. 3: SolarTest-65 Light Soaking
System.
Graph 5: SolarTest-65 “A-bulb” lamp spectrum v. solar
AM1.5 G light.
In order to confirm the stability of the received FPC samples, a second irradiation campaign was done
for 1300 hours in the SolarTest-65 lamp, where the samples ECN778, ECN779 and ECN780 are held
at a temperature of 38°C.
The UV-VIS spectra of sample ECN778 was compared after 824 hours exposure to the 470 nm LED
light, followed by 1300 hours irradiation in SolarTest-65 lamp with the A-bulb:
FULLSPECTRUM, T. Meyer, Solaronix
158/290
Graph 6: UV-VIS spectra of sample ECN778
after 824 hours exposure to the 470 nm LED
light, followed by 1300 hours irradiation in
SolarTest-65 lamp with A-bulb:
6/10