Effect of Conductive Substance Content in Polymer Electrolyte on Photovoltaic Performance of Quasi-solid-state Dye-sensitized Solar Cells

doi:10.11901/1005.3093.2017.545

Chinese Journal of Materials Research

2018, Vol. 32

Issue (10): 782-790 DOI: 10.11901/1005.3093.2017.545

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Effect of Conductive Substance Content in Polymer Electrolyte on Photovoltaic Performance of Quasi-solid-state Dye-sensitized Solar Cells

Danni ZHANG, Jie LIU, Feiyang MA, Guangben YANG, Xiaxia LIU, Henghui LI, Wangnan LI, Guijie LIANG(

)

Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang 441053, China

Cite this article:

Danni ZHANG, Jie LIU, Feiyang MA, Guangben YANG, Xiaxia LIU, Henghui LI, Wangnan LI, Guijie LIANG. Effect of Conductive Substance Content in Polymer Electrolyte on Photovoltaic Performance of Quasi-solid-state Dye-sensitized Solar Cells. Chinese Journal of Materials Research, 2018, 32(10): 782-790.

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Abstract

Novel (PEO-PVP)/LiI/I₂ gel electrolyte was prepared by blending polyvinylpyrrolidone (PVP) and polyethylene oxide (PEO), and then the quasi-solid-state sensitized solar cell was prepared with the electrolyte. The effect of the amount of conductive substance on the conductivity of electrolyte, interfacial recombination kinetics between TiO₂ and electrolyte, and the photoelectric performance of the DSSC was investigated. It follows that with the increase amount of the conductive substance, the recombination resistance and recombination reaction factor decrease gradually for the recombination between the light-generated electrons on TiO₂ with the I₃^- in the electrolyte, thereby the recombination reaction is facilitated, correspondingly the open circuit voltage (V_OC) of the dye-sensitized solar cells (DSSC) also reduced gradually. When the conductive substance is less than 15% (in mass fraction), the short-circuit current (J_sc) is controlled by the conductivity of the electrolyte, and the increase of the conductive substance may result in enhancement of the conductivity and the J_sc value. When the conductive substance is more than 15%, the dark current (j₀) of the DSSC becomes the dominant factor affecting the J_sc value, and the increase of the conductive substance caused increase of j₀ while decrease of the J_sc. The conversion efficiency (η) of the DSSC increases first and then decreases with the increase of the conductive substance and which reaches the optimum value of 5.6% when the amount of conductive substance is 15%.

Key words: polymer materials gel electrolyte electrochemical impedance conductive species contents charge recombination kinetics

Received: 13 September 2017

ZTFLH:

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Fund: Supported by National Natural Science Foundation of China (No. 51502085), Science and Technology Research Foudation of Xiangyang, and Hubei Superior and Distinctive Discipline Group (No. XKQ2018001)

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	Articles by authors
	Danni ZHANG
	Jie LIU
	Feiyang MA
	Guangben YANG
	Xiaxia LIU
	Henghui LI
	Wangnan LI
	Guijie LIANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.545 OR https://www.cjmr.org/EN/Y2018/V32/I10/782

Fig.1 Absorption spectra of the gel electrolytes. Insert is the relationship between the absorption intensity at 230 nm and 293 nm and the conductive species contents

Fig.2 Cyclic voltammetry curves of the gel electrolytes

Fig.3 Steady-state linear scanning curves of the gel electrolytes

Fig.4 Plots of the ionic diffusion coefficients of the electrolytes versus the temperature

Fig.5 Nyquist impedance spectroscopy of the gel electrolytes

Fig.6 Relationship between ionic conductivity of gel electrolytes and temperature: σ versus T (a) and lnσ versus 1000/T (b)

Fig.7 The J-V curves of the DSSC under light (a) and dark (b) conditions at room temperature

Table 1 Parameters of ionic conductivity of gel electrolyte and the photovoltaic performance of the DSSC at room-temperature (30℃)

Fig.8 The relationship between the photoelectric parameters of the DSSC (a) V_oc, (b) J_sc and (c) η and the conductive species contents in the electrolytes

Fig.9 Equivalent circuit diagrams for the DSSC under the potential of 0.4 V~0.6 V (a) and 0.7 V~0.8 V (b); Nyquist impedance spectroscopy of the DSSC based on the polymer gel electrolytes with different conductive species contents (c~h)

Fig.10 Relationship between the interfacial electron recombination resistance of TiO₂/electrolyte and the potential: R_ct versus V (a) and lnR_ct versus V (b)

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