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The stability under strong sunlight and lifetime is also a critical
parameter for polymer based solar cell, because polymer degra-
dation takes place under strong sunlight, high temperature and
some other side-reaction with metal electrode and water or
oxygen. The different degradation and failure mechanism of poly-
mer based are reviewed recently [32]. It is not viable to performthe
stability and lifetime measurement for hundreds of hours. We can
measure these under accelerated condition. The combination of
oxygen atmosphere and illumination of PV devices with visible
ight is a candidate for accelerated degradationmeasurement of the
devices. In this work, we perform the stability test at ambient
atmosphere under continuous illumination of white light. The Isc
and Voc of the device as a function of illumination time are shown in
Fig. 8. It is found that Voc of the device decreases to zero in 50 min
under white-light illumination. The photosensitivity of ZnO to the
ight could be one of the reasons to degrade the cell property [32].It
has also been reported that hybrid bulk heterojunction of P3HT and
ZnO nanoparticles increases the lifetime of the devices [34]. After
prolong UV illumination, all electron traps are filled and excessive
free electron causes the ZnO to attain the properties of a conductor
and as a results photovoltaic behavior decreases.

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