Photocurrent enhancements of organic solar cells by altering dewetting of
plasmonic Ag nanoparticles
#MMPMID26388104
Fleetham T
; Choi JY
; Choi HW
; Alford T
; Jeong DS
; Lee TS
; Lee WS
; Lee KS
; Li J
; Kim I
Sci Rep
2015[Sep]; 5
(?): 14250
PMID26388104
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Incorporation of metal nanoparticles into active layers of organic solar cells is
one of the promising light trapping approaches. The size of metal nanoparticles
is one of key factors to strong light trapping, and the size of thermally
evaporated metal nanoparticles can be tuned by either post heat treatment or
surface modification of substrates. We deposited Ag nanoparticles on ITO by
varying nominal thicknesses, and post annealing was carried out to increase their
size in radius. PEDOT: PSS was employed onto the ITO substrates as a buffer layer
to alter the dewetting behavior of Ag nanoparticles. The size of Ag nanoparticles
on PEDOT: PSS were dramatically increased by more than three times compared to
those on the ITO substrates. Organic solar cells were fabricated on the ITO and
PEDOT: PSS coated ITO substrates with incorporation of those Ag nanoparticles,
and their performances were compared. The photocurrents of the cells with the
active layers on PEDOT: PSS with an optimal choice of the Ag nanoparticles were
greatly enhanced whereas the Ag nanoparticles on the ITO substrates did not lead
to the photocurrent enhancements. The origin of the photocurrent enhancements
with introducing the Ag nanoparticles on PEDOT: PSS are discussed.
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