title: Restrain recombination by spraying pyrolysis TiO2on NiO film for quinoxaline-based p-type dye-sensitized solar cells.
abstract: 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 TiO2on the surface of NiO film as a barrier layer, which contributed to the improvement of the photocurrent density from 3.00 to 3.84mAcm-2. The p-DSSCs based on BQI reached the PCE of 0.20% at an irradiance of 100mWcm-2simulated AM1.5 sunlight. Electrochemical impedance spectroscopy (EIS) analysis indicated that the hole recombination resistance of p-DSSCs with TiO2barrier layer was larger than that of the naked NiO film. Meanwhile, the surface profile of TiO2on NiO film was verified by scanning electron microscope (SEM), X-ray diffraction (XRD) and the time of flight-secondary ion mass spectrometry (TOF-SIMS).
authors.affiliation: Key Laboratory for Advanced Materials, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, PR China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Key Laboratory for Advanced Materials, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, PR China.
authors.forename: Xing
authors.initials: X
authors.lastname: Li
authors.affiliation: Key Laboratory for Advanced Materials, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, PR China.
authors.forename: Zhongjin
authors.initials: Z
authors.lastname: Shen
authors.affiliation: Key Laboratory for Advanced Materials, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, PR China.
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Applied Physical Chemistry, Center of Molecular Devices, Department of Chemistry, School of Chemical Science and Engineering, KTH-Royal Institute of Technology, SE-10044 Stockholm, Sweden.
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
authors.affiliation: Key Laboratory for Advanced Materials, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, PR China.
authors.forename: Yuting
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Key Laboratory for Advanced Materials, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, PR China.
authors.forename: Tao
authors.initials: T
authors.lastname: Jiang
authors.affiliation: Key Laboratory for Advanced Materials, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, PR China. Electronic address: jlhua@ecust.edu.cn.
authors.forename: Jianli
authors.initials: J
authors.lastname: Hua
keywords: Quinoxaline; Sensitizer; TiO(2) barrier layer; p-type DSSCs