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Frontiers of Optoelectronics

Front. Optoelectron.    2016, Vol. 9 Issue (1) : 60-70     DOI: 10.1007/s12200-016-0567-6
RESEARCH ARTICLE |
Effect of electron-withdrawing groups in conjugated bridges: molecular engineering of organic sensitizers for dye-sensitized solar cells
Jie SHI1,2,Zhaofei CHAI1,Runli TANG1,Huiyang LI1,Hongwei HAN3,Tianyou PENG1,Qianqian LI1,*(),Zhen LI1,*()
1. Department of Chemistry, Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials, Wuhan University, Wuhan 430072, China
2. Hubei Key Laboratory of Oilcrops Lipid Chemistry and Nutrition, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
3. Michael Gr?tzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
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Abstract

Four organic sensitizers containing quinoxaline or benzoxadiazole as an auxiliary electron acceptor in conjugated bridge were synthesized and utilized for dye-sensitized solar cells (DSSCs). It was found that the incorporation of different electron-withdrawing moieties can affect the absorption spectra, electronic properties, the interfacial interactions and then the overall conversion efficiencies significantly. Therefore, the appropriate selection of the auxiliary acceptor was important to optimize the photovoltaic performance of solar cells. Among these sensitizers, LI-44 based solar cell showed the best photovoltaic performance: a shortcircuit photocurrent density (Jsc) of 13.90 mA/cm2, an open-circuit photovoltage (Voc) of 0.66 V, and a fill factor (FF) of 0.66, corresponding to an overall conversion efficiency of 6.10% under standard global AM 1.5 solar light conditions.

Keywords dye-sensitized solar cells (DSSCs)      auxiliary electron acceptor      quinoxaline      benzoxadiazole     
Corresponding Authors: Qianqian LI,Zhen LI   
Just Accepted Date: 11 January 2016   Online First Date: 18 February 2016    Issue Date: 18 March 2016
 Cite this article:   
Jie SHI,Zhaofei CHAI,Runli TANG, et al. Effect of electron-withdrawing groups in conjugated bridges: molecular engineering of organic sensitizers for dye-sensitized solar cells[J]. Front. Optoelectron., 2016, 9(1): 60-70.
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http://journal.hep.com.cn/foe/EN/10.1007/s12200-016-0567-6
http://journal.hep.com.cn/foe/EN/Y2016/V9/I1/60
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Jie SHI
Zhaofei CHAI
Runli TANG
Huiyang LI
Hongwei HAN
Tianyou PENG
Qianqian LI
Zhen LI
Fig.1  Chemical structures of the four organic sensitizers
Fig.2  Scheme 1 Synthetic routes of the four organic sensitizers
Fig.3  UV-vis spectra of the four organic sensitizers in CH2Cl2
Fig.4  UV-vis spectra of the four organic sensitizers on TiO2 films
dyelmaxa/nmea/(M-1·cm-1)lmaxb/nmE0-0c/eVEoxd/Vvs NHEErede/Vvs NHE
LI-44499467004902.090.94- 1.15
LI-45492370004882.141.19- 0.95
LI-46530277005281.950.95- 1.00
LI-47532440005311.911.20- 0.72
Tab.1  Absorbance and electrochemical properties of the sensitizers
Fig.5  Frontier orbitals of the sensitizers optimized at the B3LYP/6-31G* level
Fig.6  Spectra of monochrmatic IPCE for DSSCs based on these sensitizers
Fig.7  Current density-voltage characteristics obtained with a nanocrystalline TiO2 film supported on FTO conducting glass and derivatized with monolayer of sensitizers
Fig.8  Dark-current density-potential curves of DSSCs based on these sensitizers
sensitizerCDCA bJsc/(mA·cm-2)Voc/VFFh/%
LI-44none13.900.660.666.10
1 mM11.900.650.685.35
5 mM10.930.640.624.35
LI-45none8.310.600.683.37
1 mM9.430.610.714.03
5 mM8.560.630.683.67
LI-46none2.930.510.751.13
1 mM3.100.520.731.18
5 mM2.890.520.681.02
LI-47none4.430.550.751.84
1 mM3.580.560.771.56
5 mM1.730.560.720.70
Tab.2  Performance data of DSSCs based on the four sensitizers a
Fig.9  EIS for DSSCs based on the sensitizers. (a) Nyquist plots in the dark; (b) Nyquist plots under illumination
Fig.10  Electron lifetime fitted from impedance spectra under a series of applied potentials
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