Enhancing Loading Amount and Performance of Quantum-Dot-Sensitized Solar Cells Based on Direct Adsorption of Quantum Dots from Bicomponent Solvents
Enhancing Loading Amount and Performance of Quantum-Dot-Sensitized Solar Cells Based on Direct Adsorption of Quantum Dots from Bicomponent Solvents
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基于双组分溶剂直接吸附量子点提高量子点敏化太阳能电池的负载量和性能
DOI：
10.1021/acs.jpclett.8b03713
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发表时间：
2019
影响因子：
5.7
通讯作者：
Zhong Xinhua
中科院分区：
文献类型：
--
作者：
Wang Wenran;Rao Huashang;Fang Wenjuan;Zhang Hua;Zhou Mengsi;Pan Zhenxiao;Zhong Xinhua
在直接吸附过程中，油溶性量子点 (QD) 和 TiO2 之间本质上较弱的相互作用限制了 QD 负载和 QD 敏化太阳能电池 (QDSC) 的性能。在此，研究了控制 TiO2 上 QD 吸附的基本化学和机制，以提高 QD 负载和电池性能。实验结果表明溶剂极性在确定量子点负载量方面起着至关重要的作用。与单组分溶剂相比，在双组分溶剂的临界点 (CP) 处可以实现更高的 QD 负载量，此时 QD 变得亚稳态并开始沉淀。通过这种策略，ZCISe QDSC 获得了 12.24% 的平均效率，与基于加帽配体诱导自组装途径的效率相当。该报告展示了CP双组分溶剂在高QD负载和优异的电池性能方面的巨大潜力，并提供了使用不同纳米晶体和基材组装功能复合材料的平台。
Intrinsically weak interaction between oil-soluble quantum dots (QDs) and TiO2in a direct adsorption process limits QD loading and the performance of QD-sensitized solar cells (QDSCs). Herein, the underlying chemistry and mechanisms governing QD adsorption on TiO2were studied to improve QD loading and cell performance. Experimental results indicate that solvent polarity plays the crucial role in determining QD loading. Compared with single-component solvents, substantially greater QD loading can be realized at the critical point (CP) of bicomponent solvents, where QDs become metastable and start to precipitate. Through this strategy, average efficiency of 12.24% was obtained for ZCISe QDSCs, which is comparable to those based on the capping ligand induced self-assembly route. This report demonstrates the great potential of bicomponent solvents at the CP for high QD loading and excellent cell performance and presents a platform for assembling functional composites with the use of different nanocrystals and substrates.