The
Effects of Fluorine-Contained Molecules on Improving the Polymer Solar
Cell by Curing the Anomalous S‑Shaped <i>I</i>–<i>V</i> Curve
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Abstract
In this study, we investigate the
effects of fluorinated poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate)
buffer layer on the performance of polymer photovoltaic cells. We
demonstrate for the first time, the deterioration of the device performance
can be effectively mended by modifying the interface between the active
layer and buffer layer with heptadecafluoro-1,1,2,2-tetra-hydro-decyl
trimethoxysilane (PFDS) and perfluorononane. Device performance shows
a substantial enhancement of short-circuit current from 7.90 to 9.39
mA/cm<sup>2</sup> and fill factor from 27% to 53%. The overall device
efficiency was improved from 0.98% to 3.12% for PFDS modified device.
The mechanism of S-shape curing is also discussed. In addition, the
stability of modified devices shows significant improvement than those
without modification. The efficiency of the modified devices retains
about half (1.88%) of its initial efficiency (4.1%) after 30 d compared
to the unmodified ones (0.61%), under air atmosphere