Large area organic photovoltaic modules have been fabricated with 232.8 cm2 of total area with 108 cm2
of photoactive area. Efficiencies up to 2.3% by active area (1.1% by total area) demonstrate operation of a multicell module with configurable voltage and current output. NREL certification
is reported and is an example of the largest OPV module certified by NREL, as well as the only polymer:fullerene-based module tested. Module lifetime data were collected and with ca. 550 h of
light-soaking, > 2000h of lifetime is expected based on extrapolation. The conditions of the test were 100% duty cycle, ~ 1 Sun Xe-arc lamp, KG5-Si reference, ~25 °C controlled
temperature. The lifetime data were normalized with respect to the variations and fade of the Xe-arc lamp source.
We report NREL-certified efficiencies and initial lifetime data for organic photovoltaic (OPV) cells based on Plexcore
PV photoactive layer and Plexcore HTL-OPV hole transport layer technology. Plexcore PV-F3, a photoactive layer
OPV ink, was certified in a single-layer OPV cell at the National Renewable Energy Laboratory (NREL) at 5.4%, which
represents the highest official mark for a single-layer organic solar cell. We have fabricated and measured P3HT:PCBM
solar cells with a peak efficiency of 4.4% and typical efficiencies of 3 - 4% (internal, NREL-calibrated measurement)
with P3HT manufactured at Plextronics by the Grignard Metathesis (GRIM) method. Outdoor and accelerated lifetime
testing of these devices is reported. Both Plexcore PV-F3 and P3HT:PCBM-based OPV cells exhibit >750 hours of
outdoor roof-top, non-accelerated lifetime with less than 8% loss in initial efficiency for both active layer systems when
exposed continuously to the climate of Western Pennsylvania. These devices are continuously being tested to date.
Accelerated testing using a high-intensity (1000W) metal-halide lamp affords shorter lifetimes; however, the true
acceleration factor is still to be determined.
The rapid growth of OLEDs will occur when device performance, particularly lifetime, and production costs are optimized. Plextronics Inc. is using a versatile technology platform to develop HIL technology that will address critical degradation factors of solution processed OLEDs. In particular, significant effort has been applied to understanding the impact of inputs including the inherently conductive polymer, dopant system, solvent system, and additional functional additives, on resulting HIL film properties, which are presented here.