Development of Inverted Organic Solar Cells with TiO2 Interface Layer by Using Low-Temperature Atomic Layer Deposition

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• 作者：Zhenhua Lin ; Changyun Jiang ; Chunxiang Zhu ; Jie Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：5
• 期：3
• 页码：713-718
• 全文大小：436K
• 年卷期：v.5,no.3(February 13, 2013)
• ISSN：1944-8252

文摘

Organic solar cells (OSCs) with inverted structure have attracted much attention in recent years because of their improved device air stability due to the use of stable materials for electrodes and interface layers. In this work, TiO₂ films, fabricated using low temperature (e.g., 130鈥?70 掳C) atomic layer deposition (ALD) on ITO substrates, are used as electron selective interface layers to investigate inverted OSCs. It is found that though the as-deposited TiO₂ films are high resistive due to the presence of oxygen defects, the defects can be significantly reduced by light soaking. PV cells with 15-nm-thick amorphous-TiO₂ layers fabricated at low temperature show better performance than those with poly crystal TiO₂ with same thickness deposited at 250 掳C. The low temperature ALD-grown TiO₂ films are dense, stable and robust with capability of conformal coating on nanostructural surfaces, showing a promising interface layer for achieving air-stable plastic OSCs with roll-to-roll mass production potential.

Keywords:

low-temperature fabrication; TiO₂ thin film; atomic layer deposition; inverted structure; organic solar cells; light soaking