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Plasmon enhanced performance of
organic solar cells using
electrodeposited Ag nanoparticles
教授:林克默博士
學生:董祐成
日期:2010/11/15
Outline
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Introduction
Result and Discussion
Conclusion
Introduction

To overcome weak absorbance of the photoactive layer, which
is one significant limiting factor to the efficiency of
P3HT/PCBM based BHJ solar cells, several approaches
including the utilization of low-band gap polymers that absorb
the red and near infrared parts of the solar spectrum, the
application of periodic nanostructures for light trapping in the
active layer, the use of inorganic optical spacer between active
layer and metal electrode, and the incorporation of metal
nanostructures to increase the absorption of organic materials
due to the high electromagnetic field strength in the vicinity of
the excited surface plasmons have been reported.

In this letter, we report on the incorporation of Ag
nanoparticles prepared by the pulse-current PC
electrodeposition, which is a kind of simple and quick
solution process that can control the density and size
of metal nanoparticles on conductive substrates at
room temperature, to improve the power conversion
efficiency as the result of the enhanced optical
absorption of incident photon within the active layer.
Result and Discussion
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By applying electrodeposited Ag nanoparticles on
ITO modified with polyelectrolyte layers composed
of poly(sodium-4-styrenesulfonate)(PSS)(2mg/mL)
and poly(allylamine hydrochloride)(2mg/mL).
Here, electrodeposition of Ag on ITO coated glass
substrates was carried out using an aqueous solution
of 10 mM AgNO3 and 50 mM H2SO4 under the
condition.

The Ag nanoparticles present the following two
absorption bands: one at 368 nm and the other at
420 nm, which can be assigned to the quadrupole and
dipole plasmon bands of Ag nanoparticles,
respectively.

Figure 3a shows the photocurrent density-voltage
characteristics measured with a Keithley 4200 source
measurement unit under 100 mW/cm2 illumination
from 1 kW Oriel solar simulator with an AM 1.5 G
filter in N2 filled glovebox.

In Fig. 3b. An enhancement over the entire excitation
spectral range longer than 400 nm, which is related to
the SPR band of electrodeposited Ag nanoparticles,
was observed for cell with Ag nanoparticles. These
results indicate that LSPR might induce more
photogenerated charge carriers by stronger absorption
of an active layer, resulting from the stronger
enhancement in electromagnetic field near the metal
surface.
Conclusion
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克服薄弱吸收太陽光譜的有機太陽能電池，將統
一尺寸的銀奈米粒子(13奈米)通過 PC電，總功率
轉換效率從 3.05％上升至3.69％，主要起因於提
高電流密度，而增強吸收的光活性共軛聚合物由
於活躍的表面電漿在高強度電磁場的附近。
改良的光電轉換量子效率也有人觀察出在太陽能
轉換波長範圍在超過 400奈米有電沉積奈米銀粒
子表面電漿共振能帶。
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