A novel polysulfide hydrogel electrolyte based on low molecular mass organogelator for quasi-solid-state quantum dot-sensitized solar cells
A novel polysulfide hydrogel electrolyte based on low molecular mass organogelator for quasi-solid-state quantum dot-sensitized solar cells
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一种基于低分子量有机凝胶剂的新型多硫化物水凝胶电解质，用于准固态量子点敏化太阳能电池
DOI：
10.1016/j.jpowsour.2015.03.049
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发表时间：
2015-06
影响因子：
9.2
通讯作者：
Songyuan Dai
中科院分区：
文献类型：
--
作者：
Zhipeng Huo;Li Tao;Shimao Wang;Junfeng Wei;Jun Zhu;Weiwei Dong;Feng Liu;Shuanghong Chen;Bing Zhang;Songyuan Dai
以12-羟基硬脂酸为低分子量有机胶凝剂，将聚硫电解质胶凝化，制备了准固态量子点敏化太阳能电池。值得注意的是，该聚硫化物水凝胶电解质的凝胶至液体转变温度为96 °C，这有助于准固态QDSSC（QS-QDSSC）的长期稳定性。利用电化学阻抗谱研究了凝胶化对QS-QDSSC的电荷传输、电子复合和光伏性能的影响。此外，通过场发射扫描电子显微镜和偏光显微镜研究了水凝胶的网络结构。结果表明，水凝胶电解质中的网络结构影响了电荷的传输，加速了光阳极/电解质界面的电子复合，从而降低了开路电压. QS-QDSSC在AM 1.5（100 mW cm-2）下表现出2.40%的能量转换效率，这略低于基于液体电解质的电池的能量转换效率（2.88%）。然而，QS-QDSSC在加速热测试期间表现出显著改善的稳定性。特别是，在加速老化过程中，基于液体电解质的QDSSC的短路电流密度（Jsc）急剧下降到其初始值的近35%，而QS-QDSSC的Jsc变化相对较小。
A quasi-solid-state quantum dot-sensitized solar cell (QDSSC) is fabricated by using 12-hydroxystearic acid as a low molecular mass organogelator to gelate the polysulfide electrolyte. Noticeably, the gel to liquid transition temperature of this polysulfide hydrogel electrolyte is 96 °C, which contributes to the long-term stability of the quasi-solid-state QDSSC (QS-QDSSC). The influences of gelation on the charge transport, electron recombination and photovoltaic performance of the QS-QDSSC are investigated by electrochemical impedance spectroscopy. Moreover, the network of the hydrogel is investigated by the Field emission scanning electron microscopy and polarized optical light microscopy. It is found that the charge transport is influenced by the network in the hydrogel electrolyte, and the accelerated electron recombination at the photoanode/electrolyte interface leads to the decreased open-circuit voltage. The QS-QDSSC exhibits an energy conversion efficiency of 2.40% at AM 1.5 (100 mW cm−2) which is slightly lower than that of liquid electrolyte based cell (2.88%). However, the QS-QDSSC exhibits significantly improved stability during the accelerated thermal test. Especially, during the accelerated aging test, the short-circuit current density (Jsc) of the liquid electrolyte based QDSSC sharply decreased to nearly 35% of its initial value, while there is relatively less change in theJscfor the QS-QDSSC.
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