Enhanced Performance of PbS-quantum-dot-sensitized Solar Cells via Optimizing Precursor Solution and Electrolytes.
Enhanced Performance of PbS-quantum-dot-sensitized Solar Cells via Optimizing Precursor Solution and Electrolytes.
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通过优化前驱体溶液和电解质增强 PbS 量子点敏化太阳能电池的性能
DOI：
10.1038/srep23094
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发表时间：
2016-03-15
影响因子：
4.6
通讯作者：
Cao G
中科院分区：
文献类型：
--
作者：
Tian J;Shen T;Liu X;Fei C;Lv L;Cao G
报道了一种功率转换效率为4%的PbS量子点敏化太阳能电池(QDSC)。采用连续离子层吸收反应(SILAR)法在介孔二氧化钛薄膜上生长了PbS量子点。研究发现，前驱体溶液的浓度对量子点的生长有很大影响。在低浓度下，晶体生长的速度限制因素是前驱体离子的吸附，而在高浓度溶液中，晶体的表面生长成为限制因素。前驱体溶液的最佳浓度为0.06 M。为了进一步提高QDSCs的性能，用甲醇代替30%的多硫化物电解液中的去离子水，改善了电解液在TiO2膜中的润湿性和渗透性，加速了氧化还原电偶在电解液中的扩散，改善了光阳极与电解液界面的电荷转移。甲醇还提高了PbS量子点在电解液中的稳定性，减少了电荷复合，延长了电子寿命。结果表明，QDSC的PCE提高到4.01%。
This work reports a PbS-quantum-dot-sensitized solar cell (QDSC) with power conversion efficiency (PCE) of 4%. PbS quantum dots (QDs) were grown on mesoporous TiO2film using a successive ion layer absorption and reaction (SILAR) method. The growth of QDs was found to be profoundly affected by the concentration of the precursor solution. At low concentrations, the rate-limiting factor of the crystal growth was the adsorption of the precursor ions and the surface growth of the crystal became the limiting factor in the high concentration solution. The optimal concentration of precursor solution with respect to the quantity and size of synthesized QDs was 0.06 M. To further increase the performance of QDSCs, the 30% deionized water of polysulfide electrolyte was replaced with methanol to improve the wettability and permeability of electrolytes in the TiO2film, which accelerated the redox couple diffusion in the electrolyte solution and improved charge transfer at the interfaces between photoanodes and electrolytes. The stability of PbS QDs in the electrolyte was also improved by methanol to reduce the charge recombination and prolong the electron lifetime. As a result, the PCE of QDSC was increased to 4.01%.