이종람 교수 연구실 (16.05)

admin | 2016.07.11 15:59 | 조회 129






Abstract

Flexible inverted top-illuminated polymer solar cells (IT-PSCs) are fabricated
by wetting of polyelectrolyte and designing a microcavity structure by laying
an indium-tin-oxide (ITO) interlayer on top of an Ag reflector. The ITOcoated
Ag makes the surface hydrophilic, thereby improving wettability of
polyethyleneimine (PEIE). This increased wettability of PEIE yields a reflective
cathode with low work function of 3.73 eV. The ITO layer also tunes the
light absorption spectrum in the active layer. Finite-domain time-difference
simulation provides evidence that the ITO layer played a role in both the shift
in resonant wavelength in the microcavity and confinement of the electric
field to the active layer. Time-dependent simulation suggests that the time
to reach steady-state light absorption is longer (6.6 fs) when a microcavity
is present than when it is not present (3.8 fs); i.e., the microcavity increases
light absorption in the active layer. The designed IT-PSCs show a maximum
photo-conversion efficiency of 6.4% on plastic film and 6.1% on opaque
copper foil; these are the highest values obtained by top-illuminated PSCs
on a metallic substrate. The IT-PSCs have excellent mechanical flexibility and
more stable in air than conventional normal structured devices.

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Dual Effect of ITO-Interlayer on Inverted Top-Illuminated Polymer Solar Cells:

Wetting of Polyelectrolyte and Tuning of Cavity

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