Experimental Studies of Plasmonic Nanoparticle Effects on Organic Solar Cells - Organic Solar Cells: Materials and Device Physics - page 222

Fig. 8.9 The absorption spectrum of Au NPs in chloroform/chlorobenzene (1:1 volume ratio)
with the peak at *520 nm. Inset is the TEM image of Au NPs. The white color bar is 20 nm long
[ 35 ]
Fig. 8.10 a The current-voltage characteristics of the representative OSCs incorporated with
different NP concentration under AM 1.5G illumination at 100 mW/cm 2 . b Electrical parameters
of NP incorporated OSCs: (i) V OC ; (ii) J SC ; (iii) FF; (iv) PCE [ 35 ]
speed and time, annealing temperature, and duration have been optimized for the
control devices before the addition of Au NPs.
It is observed that Au NPs with a low concentration of 0.5 wt% improve V OC
and J sc . However, both V OC and J sc reduce when Au NPs concentration increases
further. FF increases slightly and then decreases as Au NPs concentration
increases. From the dark J-V characteristic, it can be observed that the electrical
conductivity improves by adding Au NPs, which is in good agreement with other
reports [ 15 ]. However, the electrical conductivity reduces with the further increase
of Au NPs concentration [2 wt%. Consequently, PCE is improved by *32 %
from 1.64 (without Au NPs) to 2.17 % (with 0.5 wt% Au NPs), and then