In Situ versus ex Situ Assembly of Aqueous-Based Thioacid Capped CdSe Nanocrystals within Mesoporous TiO2 Films for Quantum Dot Sensitized Solar Cells

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• 作者：Hongkang Wang ; Chunyan Luan ; Xueqing Xu ; Stephen V. Kershaw ; Andrey L. Rogach
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：January 12, 2012
• 年：2012
• 卷：116
• 期：1
• 页码：484-489
• 全文大小：388K
• 年卷期：v.116,no.1(January 12, 2012)
• ISSN：1932-7455

文摘

We report a straightforward in situ deposition method to directly assemble aqueous thioglycolic acid capped CdSe colloidal quantum dots within mesoporous TiO₂ thin films by a low-temperature hydrothermal route. This approach integrates linker assisted adsorption and colloidal quantum dot synthesis in a single step due to the use of thioglycolic acid as the capping agent for the quantum dots and tethering agent for the TiO₂. It permits high loading and uniform distribution of colloidal quantum dots within mesoporous TiO₂ electrodes with a greatly improved photovoltaic performance as quantum dot sensitized solar cells, reaching efficiencies as high as 2.2% under one sun illumination conditions after ZnS treatment, compared to the ex situ assembly technique of adsorption of presynthesized semiconductor nanocrystals.