Transformed Double-Capped Gold Nanorods in Dye Co-Sensitized Solar Cells for Semitransparent Windows
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Published:2019-02-19
Issue:3
Volume:15
Page:309-318
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ISSN:1573-4137
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Container-title:Current Nanoscience
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language:en
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Short-container-title:CNANO
Author:
Mazzoni Marina1, Dagar Janardan2, Lai Sarah1, Centi Sonia1, Ratto Fulvio1, Pini Roberto1, Zani Lorenzo3
Affiliation:
1. Istituto di Fisica Applicata “Nello Carrara” (CNR-IFAC), via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy 2. Center for Hybrid and Organic Solar Energy (C.H.O.S.E.), Dipartimento di Ingegneria Elettronica, Università di Roma “Tor Vergata”, Via del Politecnico 1, 00133 Roma, Italy 3. Istituto di Chimica dei Composti Organometallici (CNR-ICCOM), via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
Abstract
Background:
Dye sensitized solar cells (DSSCs) containing two different dyes were recently used for
applications to windows. To enhance the efficiency of this type of solar cells by means of the effect of localized
surface plasmon resonance (LSPR), we produced gold nanorods (GNRs) with an aspect ratio (a.r.) equal to 3:1
and tos 4:1. With an actual window application in mind, and mainly to prevent corrosion by the redox mediator in
the cell, we considered the capping of GNRs before introducing them into the titanium oxide (TiO2) layer of the
anode. In particular, we made a double-capping with silica and titania layers for a limited total thickness (i.e.,
about 6 nm), while still allowing a significant localized LSPR effect despite the increased distance between gold
and dye molecules. We documented the different transformations in dimensions of the two types of capped gold
nanorods (c-GNRs) due to the effect of sintering. Our aim was to evaluate the influence that these transformations
would have on the photovoltaic performances of DSSCs.
Methods:
We added c-GNRs with a ratio of 2% in w/w to a transparent semiconductor paste, which was doctor
bladed on the photoanodes of the co-sensitized solar cells made with commercially available organic sensitizers
(L1 or L0) and the squaraine SQ2, which acted as a co-sensitizer. The films had a thickness of about 6 μm and
were sintered at 450°C. We used transmission electron microscopy (TEM) analysis to document the transformations,
absorbance and absorptance spectra in order to control the effects of these modifications, and transmittance
spectra for evaluating the see-through effects. We performed current-voltage, external quantum efficiency
(EQE%) and electrochemical impedance spectroscopy (EIS) characterizations of the DSSCs.
Results:
The semiconductor films with c-GNRs that had GNRs with an a.r. equal to 4:1 (c-GNRs 4:1) had lower
absorption and higher transmission as compared to those with GNRs a.r equal to 3:1 (c-GNRs 3:1). Only the c-
GNRs 3:1, which retained a similar shape and an a.r. equal to 1.5 after sintering, produced an enhancement in the
power conversion efficiency η% (23%), current Jsc (8%), and voltage Voc (2.5%) when used in combination with
the dye cocktail containing the organic dye L1. On the contrary, the presence of c-GNRs 4:1 negatively influenced
the photovoltaic performances of the cells containing this dye cocktail. The same occurred for both types of
c-GNRs with the dye cocktail containing L0.
Conclusion:
The use of c-GNRs 3:1 could actually improve the efficiency of co-sensitized DSSCs. On the other
hand, the transformed dimensions of the c-GNRs 4:1 negatively influenced the photovoltaic characteristics when
we used the same concentration of nanoparticles, and a semiconductor paste in small grains (i.e., about 20 nm).
We attributed this fact both to a reduced penetration of the dyes in the films and to an inferior plasmonic effect.
Publisher
Bentham Science Publishers Ltd.
Subject
Pharmaceutical Science,Biomedical Engineering,Medicine (miscellaneous),Bioengineering,Biotechnology
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