Dextran based highly conductive hydrogel polysulfide electrolyte for efficient quasi-solid-state quantum dot-sensitized solar cells
Dextran based highly conductive hydrogel polysulfide electrolyte for efficient quasi-solid-state quantum dot-sensitized solar cells
复制标题
用于高效准固态量子点敏化太阳能电池的葡聚糖基高导电水凝胶多硫化物电解质
DOI：
10.1016/j.electacta.2013.01.025
复制
发表时间：
2013-03-01
影响因子：
6.6
通讯作者：
Su, Cheng-Yong
中科院分区：
文献类型：
--
作者：
Chen, Hong-Yan;Lin, Ling;Su, Cheng-Yong
本文首次以葡聚糖为凝胶剂制备了高导电性水凝胶聚硫电解质，并将其用作量子点敏化太阳能电池（QDSSCs）的准固态电解质。当凝胶浓度为15%时，水凝胶电解质的电导率与液体电解质基本相同。此外，它在高温下的液态允许很好地渗透到电沉积cd /CdSe共敏TiO2光阳极的孔隙中。该凝胶电解质基QDSSC在AG 1.5 G /太阳（100 mW cm(-2)）光照下的功率转换效率（eta）为3.23%，略低于液体电解质基电池（3.69%）。利用电化学阻抗谱（EIS）和可控强度调制光电流/光电压谱（CIMPS/IMVS）研究了凝胶基和液态电解质基QDSSC的动态电子传递机理。研究发现，凝胶电解质基电池中的电子传递速度比液体电解质基电池快得多，但它比液体电解质基电池更容易重组。然而，这些差异随着光强的增加而逐渐消失，在高光强照明下显示出电子收集效率下降。结果表明，在0.12太阳照度下，凝胶电解质准固态QDSSC的转换效率为4.58%。凝胶电解质的高导电性和良好的渗透性可能是其优异光伏性能的主要原因。(C) 2013 Elsevier Ltd.版权所有。
Highly conductive hydrogel polysulfide electrolyte is first fabricated using dextran as gelator and used as quasi-solid-state electrolyte for quantum dot-sensitized solar cells (QDSSCs). The hydrogel electrolyte with gelator concentration of 15 wt% shows almost the same conductivity as the liquid one. Moreover, its liquid state at elevated temperature allow for the well penetration into the pores in electrodeposited CdS/CdSe co-sensitized TiO2 photoanode. This gel electrolyte based QDSSC exhibits power conversion efficiency (eta) of 3.23% under AG 1.5 G one sun (100 mW cm(-2)) illumination, slightly lower than that of liquid electrolyte based cell (3.69%). The dynamic electron transfer mechanism of the gel and liquid electrolyte based QDSSC are examined by electrochemical impedance spectroscopy (EIS) and controlled intensity modulated photocurrent/photovoltage spectroscopy (CIMPS/IMVS). It is found that the electron transport in gel electrolyte based cell is much faster than the liquid electrolyte based cell but it tends to recombine more easily than the latter. However, these differences fade away with increasing the light intensity, showing declining electron collection efficiency at higher light intensity illumination. As a result, a conversion efficiency of 4.58% is obtained for the gel electrolyte based quasi-solid-state QDSSC under 0.12 sun illumination. The high conductivity and the good permeation of gel electrolyte may contribute mainly to its excellent photovoltaic performance. (C) 2013 Elsevier Ltd. All rights reserved.