Improved Performance of Colloidal CdSe Quantum Dot-Sensitized Solar Cells by Hybrid Passivation
Improved Performance of Colloidal CdSe Quantum Dot-Sensitized Solar Cells by Hybrid Passivation
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DOI：
10.1021/am504536a
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发表时间：
2014-11-12
影响因子：
9.5
通讯作者：
Agren, Hans
中科院分区：
文献类型：
--
作者：
Huang, Jing;Xu, Bo;Agren, Hans
采用巯基丙酸（MPA）和碘离子在溶液中通过配体交换反应对胶体CdSe量子点（QD）表面进行改性，制备了量子点敏化太阳能电池（QDSC）。这是一种提高基于胶体量子点的量子点太阳能电池性能的有效方法。结果表明，MPA可以增加量子点在TiO 2电极上的覆盖率，促进光氧化量子点的空穴提取，同时碘离子可以弥补CdSe量子点的表面缺陷，从而降低器件中的复合损耗。这种混合钝化处理导致QDSC的功率转换效率显著提高41%。此外，碘离子与MPA的最佳比例被确定为有利的混合钝化;结果表明，过量的碘阴离子对量子点的负载是有害的。本研究表明，QDSC性能的改善可以通过使用不同功能配体的组合来钝化量子点来实现，并且溶液中的配体交换有效的方法可以引入不同的配体。
A hybrid passivation strategy is employed to modify the surface of colloidal CdSe quantum dots (QDs) for quantum dot-sensitized solar cells (QDSCs), by using mercaptopropionic acid (MPA) and iodide anions through a ligand exchange reaction in solution. This is found to be an effective way to improve the performance of QDSCs based on colloidal QDs. The results show that MPA can increase the coverage of the QDs on TiO2 electrodes and facilitate the hole extraction from the photoxidized QDs, and simultaneously, that the iodide anions can remedy the surface defects of the CdSe QDs and thus reduce the recombination loss in the device. This hybrid passivation treatment leads to a significant enhancement of the power conversion efficiency of the QDSCs by 41%. Furthermore, an optimal ratio of iodide ions to MPA was determined for favorable hybrid passivation; results show that excessive iodine anions are detrimental to the loading of the QDs. This study demonstrates that the improvement in QDSC performance can be realized by using a combination of different functional ligands to passivate the QDs, and that ligand exchange in solution effective approach to introduce can be an different ligands.