Low-Temperature Crystalline Titanium Dioxide by Atomic Layer Deposition for Dye-Sensitized Solar Cells

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• 作者：Aravind Kumar Chandiran ; Aswani Yella ; Morgan Stefik ; Leo-Philipp Heiniger ; Pascal Comte ; Mohammad. K. Nazeeruddin ; Michael Gr盲tzel
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：April 24, 2013
• 年：2013
• 卷：5
• 期：8
• 页码：3487-3493
• 全文大小：407K
• 年卷期：v.5,no.8(April 24, 2013)
• ISSN：1944-8252

文摘

Low-temperature processing of dye-sensitized solar cells (DSCs) is crucial to enable commercialization with low-cost, plastic substrates. Prior studies have focused on mechanical compression of premade particles on plastic or glass substrates; however, this did not yield sufficient interconnections for good carrier transport. Furthermore, such compression can lead to more heterogeneous porosity. To circumvent these problems, we have developed a low-temperature processing route for photoanodes where crystalline TiO₂ is deposited onto well-defined, mesoporous templates. The TiO₂ is grown by atomic layer deposition (ALD), and the crystalline films are achieved at a growth temperature of 200 掳C. The ALD TiO₂ thickness was systematically studied in terms of charge transport and performance to lead to optimized photovoltaic performance. We found that a 15 nm TiO₂ overlayer on an 8 渭m thick SiO₂ film leads to a high power conversion efficiency of 7.1% with the state-of-the-art zinc porphyrin sensitizer and cobalt bipyridine redox mediator.

Keywords:

dye-sensitized solar cells; low-temperature titanium dioxide; atomic layer deposition; templates; cobalt complex; flexible solar cell