Atomic Layer Deposition of TiO2 for a High-Efficiency Hole-Blocking Layer in Hole-Conductor-Free Perovskite Solar Cells Processed in Ambient Air

详细信息    查看全文

• 作者：Hang Hu ; Binghai Dong ; Huating Hu ; Fengxiang Chen ; Mengqin Kong ; Qiuping Zhang ; Tianyue Luo ; Li Zhao ; Zhiguang Guo ; Jing Li ; Zuxun Xu ; Shimin Wang ; Dominik Eder ; Li Wan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 20, 2016
• 年：2016
• 卷：8
• 期：28
• 页码：17999-18007
• 全文大小：678K
• 年卷期：0
• ISSN：1944-8252

文摘

In this study we design and construct high-efficiency, low-cost, highly stable, hole-conductor-free, solid-state perovskite solar cells, with TiO₂ as the electron transport layer (ETL) and carbon as the hole collection layer, in ambient air. First, uniform, pinhole-free TiO₂ films of various thicknesses were deposited on fluorine-doped tin oxide (FTO) electrodes by atomic layer deposition (ALD) technology. Based on these TiO₂ films, a series of hole-conductor-free perovskite solar cells (PSCs) with carbon as the counter electrode were fabricated in ambient air, and the effect of thickness of TiO₂ compact film on the device performance was investigated in detail. It was found that the performance of PSCs depends on the thickness of the compact layer due to the difference in surface roughness, transmittance, charge transport resistance, electron–hole recombination rate, and the charge lifetime. The best-performance devices based on optimized TiO₂ compact film (by 2000 cycles ALD) can achieve power conversion efficiencies (PCEs) of as high as 7.82%. Furthermore, they can maintain over 96% of their initial PCE after 651 h (about 1 month) storage in ambient air, thus exhibiting excellent long-term stability.