Restrain recombination by spraying pyrolysis TiO₂ on NiO film for quinoxaline-based p-type dye-sensitized solar cells

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• 作者：Ying Yu^a ; Xing Li^a ; Zhongjin Shen^a ; Xiaoyu Zhang^a ; Peng Liu^b ; Yuting Gao^a ; Tao Jiang^a ; Jianli Hua^a ; ^{jlhua@ecust.edu.cn}
• 关键词：p-type DSSCs ; Quinoxaline ; Sensitizer ; TiO2 barrier layer
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：490
• 期：Complete
• 页码：380-390
• 全文大小：2397 K
• 卷排序：490

文摘

In this work, we reported two new quinoxaline-based sensitizers (BQI and BQII) for p-type dye-sensitized solar cells (p-DSSCs) featuring carboxylic acid and pyridine as anchoring groups, respectively, in combination with triphenylamine donor. The optical, electrochemical and photovoltaic properties of BQI and BQII were investigated. Results showed that BQI-based p-DSSC with carboxylic acid anchoring group obtained higher photoelectric conversion efficiency (PCE) of 0.140%. To further optimize the device performance, we added a layer of TiO2 on the surface of NiO film as a barrier layer, which contributed to the improvement of the photocurrent density from 3.00 to 3.84 mA cm−2. The p-DSSCs based on BQI reached the PCE of 0.20% at an irradiance of 100 mW cm−2 simulated AM1.5 sunlight. Electrochemical impedance spectroscopy (EIS) analysis indicated that the hole recombination resistance of p-DSSCs with TiO2 barrier layer was larger than that of the naked NiO film. Meanwhile, the surface profile of TiO2 on NiO film was verified by scanning electron microscope (SEM), X-ray diffraction (XRD) and the time of flight-secondary ion mass spectrometry (TOF-SIMS).