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Yi-Feng Lin1 and Kuo-Chuan Ho1,2*1Institute of Polymer Science and Engineering, and 2Department of Chemical Engineering,
National Taiwan University, Taipei 10617, Taiwan* Corresponding author: [email protected]
Dye-Sensitized Solar Cell: Study of PEDOT-MeOH Films and Polymeric Ionic Liquid
Conclusions PEDOT-MeOH TCA as counter electrodes1.This template-free method was successfully used to synthesize different morphologies of PEDOT-MeOH films.2.The hierarchical PEDOT-MeOH TCA possesses both 1D charge transfer pathway and large surface area simultaneously to
give the best electro-catalytic ability.3.The DSSC with PEDOT-MeOH TCA possesses excellent cell efficiency of 9.13%, which is higher than that with Pt (8.94%).
POEI-IS as electrolytes1.From the J-V curve, the gel electrolyte containing 30 wt% of POEI-IS can render the best cell efficiency (8.18%), which is higher
than the cell with liquid selenocyanate electrolyte (6.58%).2.The DSSC employing the electrolyte containing 30 wt% of POEI-IS showed 95% remaining efficiency after 1,000 h.3.The multifunctional polymeric ionic liquid paves a promising way for developing highly efficient QSS-DSSCs.
wt % of POEI-IS in the electrolyte
Photovoltaic performance Interfacial properties Electrochemical properties
η(%)
Voc(mV)
Jsc(mA cm–2) FF Vonset
(mV)Rct2(Ω)
ZW(Ω)
τe(ms)
Rrec(Ω)
Dapp×105
(cm2 s–1)σs
(mS cm–1)
0 6.58 712 14.20 0.65 616 11.1 4.4 2.39 34.7 2.52 12.1210 5.90 785 10.70 0.70 730 15.0 6.2 5.43 40.8 2.00 11.0620 7.16 811 12.47 0.71 751 13.6 8.5 5.79 44.3 1.54 7.9430 8.18 826 13.85 0.72 753 11.5 8.9 5.87 50.3 1.00 7.0140 7.04 841 12.82 0.65 776 13.4 9.8 6.62 61.1 0.90 4.52
Introduction&MotivationThis study aimed to develop structured poly(hydroxymethyl 3,4-ethylenedioxythiophene) (PEDOT-MeOH) films as counterelectrodes (CEs) and to synthesize an iodide-free polymeric ionic liquid (PIL) as gel electrolyte for the dye-sensitized solar cells(DSSCs) with low-cost, high efficiency, and long-term stability. This study is divided into two parts: PEDOT-MeOH films asCEs and PIL as gel electrolyte.
0 200 400 600 800 10000.0
0.2
0.4
0.6
0.8
1.0
Nor
mal
ized
eff
icie
ncy
Time (h)
wt% of POEI-IS in the electrolyte 0 wt% 30 wt%
Fig.4 Chemical structure of POEI-IS.Fig.5 J-V curves of the DSSCs with various electrolytes, measured at 100 mW cm-2.
Fig. 6 Long-term durability of the DSSCs containing 0 wt% and 30 wt% of POEI-IS.
Publications1. Y.-F. Lin, C.-T. Li, K.-C. Ho*, “A template-free synthesis of the hierarchical hydroxymethyl PEDOT tube-coral array and its application in dye-sensitized
solar cells,” J. Mater. Chem. A, (2016), 4, 384-394. (was selected as the front cover)2. Y.-F. Lin, C.-T. Li, C.-P. Lee, Y.-A. Leu, Y. Ezhumalai, R. Vittal, M.-C. Chen*, J.-J. Lin*, K.-C. Ho*, “Multifunctional iodide-free polymeric ionic liquid for
quasi-solid-state dye-sensitized solar cells with a high open-circuit voltage,” ACS Appl. Mater. Interfaces, DOI: 10.1021/acsami.6b02767.
Fig. 2 Cross-sectional FE-SEM images of the films of (a) PEDOT-MeOH TA, and (b) PEDOT-MeOHTCA; their TEM images are shown in the insets correspondingly.
Fig. 1 Top-view FE-SEM images of the films of (a) PEDOT-MeOH TA and (b) PEDOT-MeOH TCA.
0 200 400 600 8000
5
10
15
Phot
ocur
rent
den
sity
(mA
cm
-2)
Voltage (mV)
Under 1 Sunwt% of POEI-IS in the electrolyte
0 wt% 10 wt% 20 wt% 30 wt% 40 wt%
Electro-catalytic film on the counter electrode
Photovoltaic performance Electrochemical propertiesη
(%)Voc(mV)
Jsc(mA cm–2) FF Jpc
(mA cm–2)k0
(cm s–1)Ae
(cm2)Pt 8.94 748 17.81 0.67 1.58 7.3×10–3 0.19
PEDOT-MeOH TA 7.85 709 17.22 0.64 1.13 5.0×10–3 0.48PEDOT-MeOH C 8.23 723 17.57 0.65 1.48 5.1×10–3 0.65
PEDOT-MeOH TCA 9.13 746 18.22 0.67 1.80 5.1×10–3 1.11
PEDOT-MeOH ascounterelectrode
POEI-ISasgelelectrolyte
Fig.3 Multifunction of POEI-IS.
