TiO2 Sub-microsphere Film as Scaffold Layer for Efficient Perovskite Solar Cells

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• 作者：Yang Huang ; Jun Zhu ; Yong Ding ; Shuanghong Chen ; Changneng Zhang ; Songyuan Dai
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：March 30, 2016
• 年：2016
• 卷：8
• 期：12
• 页码：8162-8167
• 全文大小：452K
• ISSN：1944-8252

文摘

TiO₂ sub-microspheres composed of anatase granular-like nanocrystallines with an average diameter ∼250 nm are synthesized using sol–gel method and employed as the scaffold layer for efficient mesocopic perovskite solar cells. Compared with mesoporous TiO₂ films composed of ∼18 nm nanoparticles, the sub-microsphere films show superior light-trapping characteristics and significantly improve the light-harvesting capability of the solar cells. In addition, the charge-transport performance is also dramatically improved according to the transient photocurrent decay despite there being no significant difference in the perovskite layer surface morphology. As a result, an average power conversion efficiency of 15% with a highly uniform distribution is achieved for the solar cells with TiO₂ sub-microsphere films, 12% higher than those with TiO₂ nanoparticle films. The combination of light-harvesting capability and fast charge transfer make the TiO₂ sub-microsphere film a good candidate as the scaffold layer for efficient perovskite solar cells.