聚合物电解质中导电物质含量对准固态电池光电性能的影响

doi:10.11901/1005.3093.2017.545

材料研究学报

2018, Vol. 32

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

研究论文

本期目录 | 过刊浏览

聚合物电解质中导电物质含量对准固态电池光电性能的影响

张丹妮, 刘洁, 马飞阳, 杨光本, 刘峡霞, 李恒慧, 李望南, 梁桂杰(

)

湖北文理学院低维光电材料与器件湖北省重点实验室襄阳 441053

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

引用本文:

张丹妮, 刘洁, 马飞阳, 杨光本, 刘峡霞, 李恒慧, 李望南, 梁桂杰. 聚合物电解质中导电物质含量对准固态电池光电性能的影响[J]. 材料研究学报, 2018, 32(10): 782-790.
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[J]. Chinese Journal of Materials Research, 2018, 32(10): 782-790.

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摘要:

将聚乙烯吡咯烷酮(PVP)和聚环氧乙烷(PEO)共混用作胶凝剂,制备 (PEO-PVP)/LiI/I₂凝胶电解质并组装成准固态敏化太阳电池。研究了电池中导电物质的含量对电解质的导电性能和TiO₂/电解质界面的电子复合动力学的影响,以及电池光电性能的变化规律。结果表明,随着导电物质含量的提高TiO₂上光生电子与电解质中I₃^-之间的复合电阻和复合反应因子逐渐减小,复合反应更加容易进行,使电池的开路电压(V_oc)逐渐降低。随导电物质含量的提高电池的短路电流(J_sc)先增大后减小,其原因是：当导电物质含量(质量分数)较低(<15%)时J_sc受电解质的导电性能控制,导电物质含量提高引起的电导率增大使J_sc值增大;当含量较高(>15%)时电池中较大的暗电流(j₀)成为影响J_sc的主导因素,导电物质含量提高引起的j₀值增大使J_sc值相应减小。随着导电物质含量的提高电池的光电转化效率(η)先增加后减小,并在含量为15%时达到最佳值5.6%。

关键词 ：高分子材料, 凝胶电解质, 交流阻抗, 导电物质含量, 电荷复合动力学

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

收稿日期: 2017-09-13

ZTFLH:

O646

基金资助:国家自然科学基金(51502085),襄阳市科技研究开发项目和湖北省优势特色学科群基金(XKQ2018001)

作者简介:

作者简介刘洁,女,1994年生,本科生;张丹妮,女,1995年生,本科生

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.545 或 https://www.cjmr.org/CN/Y2018/V32/I10/782

图1 凝胶电解质的吸收光谱,插图为电解质在230 nm(对应I-的吸收)和293 nm(对应I3-)处的吸收强度随导电物质含量的变化关系

图2 凝胶电解质的循环伏安曲线

图3 凝胶电解质的稳态线性扫描曲线

图4 电解质的离子扩散系数随温度的变化

图5 电解质的Nyquist阻抗谱图

图6 电解质的离子电导率与温度的关系

图7 电池在光照(a)和暗态(b)条件下的室温J-V曲线

表1 室温(30℃)下凝胶电解质的导电性能及其电池的光电性能参数

图8 DSSC的开路电压Voc、短路电流Jsc以及(c)光电转化效率η随电解质中的导电物质含量的变化

图9 0.4 V~0.6 V和0.7 V~0.8 V偏压下电池的等效电路图以及不同偏压下DSSC的Nyquist阻抗图

图10 电池中TiO2/电解质界面电子复合电阻与偏压的关系和线性拟合线

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